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Sample records for uranium mineralized area

  1. Activity concentration of uranium in groundwater from uranium mineralized areas and its neighborhood

    International Nuclear Information System (INIS)

    Arabi, S.A.; Funtua, I.I.; Dewu, B.B.M.; Alagbe, S.A.; Garba, M.L.; Kwaya, M.Y.; Baloga, A.D.

    2013-01-01

    Uranium mineralization in parts of northeastern Nigeria necessitated its exploration during early eighties by the Nigeria Uranium Mining Company (NUMCO) which was later abandoned. During their course of decay, uranium isotopes pass through radioactive decay stage and eventually into stable isotope of lead. The course of concern for soluble uranium in groundwater especially from the mineralized areas include ionizing radiation, chemical toxicity and reproductive defects for which ingested uranium has been implicated to have caused. This study is aimed at assessing the levels of concentration of uranium in groundwater to ascertain its compliance with the World Health Organization's (WHO) and the United State Environmental Protection Agency's (EPA) guideline for uranium in drinking water. Thirty five groundwater samples were collected using EPA's groundwater sampling protocol and analyzed at the Department of Geology, University of Cape Town using an Inductively Coupled Plasma Mass Spectrometric (ICP-MS) technique. Significant finding of this work was that there is radiological contamination of groundwater in the area. There is also an indication that the extent of radiological contamination is not much within the mineralized zones, therefore, there is likelihood that groundwater has acted as a medium of transporting and enhancing uranium in groundwater in an environment away from that of origin. About 5.7 % of the samples studied had uranium concentration above WHO and EPA's maximum contaminant level of 30 μg/L which is a major concern for inhabitants of the area. It was also apparent that radiological contamination at the southwestern part of the study area extends into the adjacent sheet (sheet 152). Uranium concentration above set standards in those areas might have originated from rocks around established mineralized zones but was transported to those contaminated areas by groundwater that leaches across the host rock and subsequently mobilizing soluble uranium

  2. Controlling factors of uranium mineralization and prospect prediction in Qimantage area

    International Nuclear Information System (INIS)

    Yao Chunling; Zhu Pengfei; Cai Yuqi; Zhang Wenming; Zhao Yong'an; Song Jiye; Zhang Xiaojin

    2011-01-01

    Based on the analysis of regional geology in Qimantage area, the condition for uranium mineralization is summarized in regional geology setting, volcanic, granite and faults. This study shows that this area has favorable prospect for uranium mineralization. The metallogenic model is built up according to the controlling factors over uranium mineralization. Under this model, six potential areas are predicted in MRAS software with mineralization factors of synthetically geological information method. (authors)

  3. Heterogeneity of uranium host rocks in Zhiluo formation in Dongsheng area and its relation to uranium mineralization

    International Nuclear Information System (INIS)

    Yi Chao; Zheng Yunlong; Wang Mingtai

    2013-01-01

    Numbers of uranium deposits have be found in Dongsheng area. The major ore-bearing layer is the sub member of the lower member of the Zhiluo Formation, the heterogeneity of host rocks plays an important role during the process of uranium mineralization. This paper sorted and counted up the data of sand body and the impermeable bed in Dongsheng area to study the heterogeneity characteristic of host rock and its relationship to uranium mineralization in horizontal and vertical directions. The thickness of sand body in Dongsheng area decreases gradually from northwest to southeast. The uranium mineralization is mainly distributed in the place where the thickness of sand body changed from the thick to the thin. Statistics shows that the best uranium mineralization occurred in sand body thickness between 20 m to 40 m and the sand rate over 60% in the eastern part of Dongsheng area. And the best uranium mineralization in the western part occurred in area of sand body thickness between 60 m to 70 m and the sand rate over 70%. In vertical direction, the numbers and the thickness of the impermeable beds have negative relation to sand rate. Moreover, uranium deposits generally exist in the area of less number impermeable bed and small thickness. The uranium mineralization grade decreased with the increase of number and thickness of the impermeable beds. (authors)

  4. Tectonic stress history and the relationship with uranium mineralization in Shenchong mining area

    International Nuclear Information System (INIS)

    Zhu Mingqiang; Lin Yinshan; Kang Zili

    1996-01-01

    The rejection method of maximum statistical for principal stress axis is applied to complex granite body, this paper divide mining area tectonic process into six epochs. The relationship between the tectonic process and uranium mineralization is also discussed, and the later 3 times fracture process of Diwa epoch control the removing and gathering of Uranium in this area

  5. The relational of Mesozoic volcanism to uranium mineralization in Guyuan-Hongshanzi area

    International Nuclear Information System (INIS)

    Wu Rengui; Xu Zhe; Yu Zhenqing; Jiang Shan; Shen Kefeng

    2011-01-01

    Based on the time of Mesozoic volcanism,the characteristic of major and trace element, and REE pattern of the volcanic rocks in Guyuan-Hongshanzi area, The Mesozoic volcanism can be divided into the early cycle and later cycle during the Early Cretaceous, and it's magma series is classified in two sub-series, one is alkaline series of trachyte dominated and another is subalkaline series of rhyolite dominated. The relations between Mesozoic volcanism and uranium mineralization is mainly shown in four aspects: (1) Uranium mineralization controlled by the coexist of two magma series; (2) Uranium mineralization controlled by superhypabyssal porphyry body in later cycle volcanism during the Early Cretaceous; (3) The porphyry body close to uranium mineralization,bearing the genesis characteristics of crust-mantle action; and (4) High Si and K content in the chemical composition of the mineralization volcanic rocks. (authors)

  6. Geology and potency of Uranium mineralization occurrences in Harau area, West Sumatera

    International Nuclear Information System (INIS)

    Ngadenin

    2013-01-01

    The Background of this study is due to the geological setting of Harau area and its surrounding, West Sumatera, that is identified as a favourable area for uranium accumulation which is indicated by the presence of anomalous radioactivity in the Tertiary sedimentary rocks deposited on the terrestrial environment and the presence of anomalous uranium contents in Pre-Tertiary granites in several places in West Sumatera, and the presence of radioactivity anomalous in the Pre Tertiary metamorphic rocks. The purpose of this study is to determine the potential formation of uranium mineralization in the Harau area, to be used as a basis to conduct more detailed research in order to inventory the potential of uranium resources in Indonesia. The scope of the discussion in this review includes a discussion of geology, geochemistry and radioactivity of the outcrops. The composition of regional stratigraphic from old to young is quartzite unit, phyllite unit, conglomerate unit, sandstone unit, tuff unit and alluvium river. The main fault that developed in the study area are normal faults trending southwest – northeast. The study area is splitted into two sections where the southeastern part relatives fall down of the northwest. Based on geological setting, radioactivity and uranium data then is assumed that Harau is a potential area for the formation of uranium mineralization in sandstone and its vein type. Sandstone type is expected occur in sandstone conglomerate unit of The Brani Formation and vein type is expected occur in the quartzite unit of The Kuantan Formation. (author)

  7. Geophysical features of uranium mineralization in Wadi Bahiya area, southern Jordan

    International Nuclear Information System (INIS)

    Zhao Xigang; Liang Shanming; Deng Xiaowei; Li Shengxiang; Wang Jinping

    2010-01-01

    Based on comprehensive study of geologic survey, sample analysis and ground gamma spectral survey, it is concluded that the uranium mineralization in Wadi Bahiya area, southern Jordan occurs near surface and is mostly hosted in weathered gray-brown chalk marl of Muwaqqar Chalk Marl Formation of the Upper Cretaceous and Paleocene, and belongs to surficial calcrete-type which is related to modern oxidation. The ground gamma spectral survey shows that surface anomaly area is small and big gradient change of the anomalies. The trenches reveal that uranium content of the anomalies falls down from near-surface to the deep. The analytical results of the samples from the area correspond with the gamma spectral measurements, demonstrating that uranium mineralization is mainly located within the depth between 0.5 and 1.5 m. (authors)

  8. Characteristics of gravity and magnetic field and their relationship with uranium mineralization in northern Guangxi area

    International Nuclear Information System (INIS)

    Shu Xiaojing; Yin Zhongfan; Hao Yuhua; guan Nansheng; Li Xuexun

    1993-08-01

    The characteristics of gravity and magnetic field, deep-seated structures and their relationship with uranium mineralization in Northern Guangxi are investigated. Especially, based on geophysical investigation, the distinguishing features of uranium ore-forming are discussed, involved with the uranium source body, the heating force and mechanical force of granite magma acted on uranium mineralization, the deep-seated geological process, the hydrothermal activity, the formation environments of granite-type uranium deposit, the source of pyrite and its influence on uranium mineralization, the uranium ore-forming of Sinian-Cambrian periods and devonian period formations, and the simple model of uranium ore-forming. On the basis of the relationship of uranium mineralization with geophysical field, as well as the ore-forming geological environments inferred by gravity and magnetic field investigation, the physical-geological model is established in order to predicate uranium prospect

  9. Fault rocks and uranium mineralization

    International Nuclear Information System (INIS)

    Tong Hangshou.

    1991-01-01

    The types of fault rocks, microstructural characteristics of fault tectonite and their relationship with uranium mineralization in the uranium-productive granite area are discussed. According to the synthetic analysis on nature of stress, extent of crack and microstructural characteristics of fault rocks, they can be classified into five groups and sixteen subgroups. The author especially emphasizes the control of cataclasite group and fault breccia group over uranium mineralization in the uranium-productive granite area. It is considered that more effective study should be made on the macrostructure and microstructure of fault rocks. It is of an important practical significance in uranium exploration

  10. Geological setting of uranium mineralizations in the Hotagen area, Central Swedish Caledonides

    International Nuclear Information System (INIS)

    Troeng, B.; Wilson, M.R.

    1982-01-01

    Uranium-vein-type mineralizations with economic potential occur within, or very near, a Precambrian window within the Caledonides north of Oestersund. Two main areas with uranium prospects have been located in the northwest and northeast sectors of the window by ground prospecting and by airborne radiometric and geochemical surveys. The Sjaule and Flistjaern prospects in the northwest of the window are joint-filling-type mineralizations that clearly post-date Caledonian nappe emplacement. Long narrow northeast-trending vertical joint systems with pitchblende infillings cut through basement microgranite, dolerite and acid volcanic rocks as well as Caledonian quartzite, limestone and phyllite. The mineralizations in the northeast are governed by mainly NNE vertical structures ranging from metre-wide, hydrothermally altered crush zones with pitchblende impregnations to narrow joints with pitchblende infillings. The Lilljuthatten deposit with at least 1200 tonnes uranium occupies a stockwork of crush zones in a pervasively fractured high-uranium granite near a dolerite dyke. It is suggested that the uranium was leached from the Precambrian rocks of the window by solutions generated through Caledonian metamorphism. The solutions could travel easily through the crushed rocks and precipitate their loads under conditions of lower T and P or in suitable structures. (author)

  11. Techniques of uranium mineralization alteration remote sensing information identification and its application in Taoshan area, Jiangxi province

    International Nuclear Information System (INIS)

    Xuan Yanxiu; Zhang Jielin

    2010-01-01

    Based on the spectrum characteristics analysis of uranium mineralization alteration rocks and minerals, and using satellite multi-spectral remote sensing image data as the main information sources, multiple remote sensing data processing techniques and methods such as color compound, band ratio, principal component analysis and image color segmentation, are synthetically applied to extract uranium mineralization and alteration information from the remote sensing image. The results of this study provided basic data for analysis of uranium ore-formation conditions in the area. (authors)

  12. Petrography, metasomatism and mineralization of uranium and other radioactive minerals in the Narigan Area (Central Iran) Islamic Republic of Iran

    International Nuclear Information System (INIS)

    Fazeli, A.; Azizaliabad, M.; Iranmanesh, J.

    2014-01-01

    , phyllic and propylitic alteration zones. Ni shows an adaptable increase in phlogopite-magnetite zone and hornfelsic, propylitic alterations. Uranium mineralization in this study area, is comparable with two uranium ore types: plutogenic and volcanogenic. These matters were indicated by various alteration types that observed in Narigan area. In plutonic-type uranium mineralization, uranium is present in sulphide-uraninite and arsenideuraninite types. In the Narigan Zone, the presence of sulphide is seen in minerals like pyrite, calcopyrite, and sphalerite. Existence of arsenide is indicated by a few minerals such as: arsenopyrite and glokodot and also relative enrichment of elements like Ag, Bi, Co, Ni and U in some veins. These are signatures for sulphide-uraninite and arsinide-uraninite mineralizing type. Presence of brannerite (davidite-branerite paragenesis) in thin sections is an index signature for volcanogenic uranium-titanium mineralizing type. The secondary titanium-bearing minerals are made by ilmenite and sphene alterations. Relative enrichment of elements like Cu, Mo, Ni, Pb and Zn is made by the effect of high temperature potassic phase on the Narigan volcanogenic rocks. With the consideration of sub-volcanic nature of Narigan zone, metasomatic processes and related hydrothermal phases have been active in shallow environment. On the basis of Bardina and Popov classification the different metasomatic processes at Narigan area have happened in basic to acidic circumstance, with pH 3-9 under temperature range of 150-600°C. (author)

  13. Investigations into Pb isotope signatures in groundwater and sediments in a uranium-mineralized area

    Energy Technology Data Exchange (ETDEWEB)

    Vecchia, Adriana Monica Dalla; Rodrigues, Paulo Cesar Horta; Rios, Francisco Javier; Ladeira, Ana Claudia Queiroz, E-mail: amdvc@cdtn.br, E-mail: acql@cdtn.br, E-mail: javier@cdtn.br, E-mail: pchr@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2017-01-15

    This work presents the investigation in an environment that contains uranium deposits by using Pb isotope signatures. The study area, southeast of Brazil, is characterized by the lack of surface water and, as a consequence, the groundwater plays an important role in the economy of the region, such as the supply to the uranium industry and, above all serving the needs of the local population. The objective of the present investigation is the determination of the signatures of Pb in groundwater and sediments as well as the identification of environments under influences of geogenic and/or anthropogenic sources. It was determined that the Pb in the majority of sediments was geogenic in origin. Although data from the literature, related to the environmental studies, consider {sup 206}Pb/{sup 207}Pb isotopic ratio values below or close to 1.2 as an indicative of anthropogenic Pb, the {sup 206}Pb/{sup 207}Pb determined for the majority of groundwater samples ranged from 1.14 to 1.19, and are similar to the data reported for rocks samples (1.09 to 1.96) from area with U mineralization. It was also determined that the anthropogenic influence of the uranium was restricted to a single sampling point within the mining area. (author)

  14. Investigations into Pb isotope signatures in groundwater and sediments in a uranium-mineralized area

    Directory of Open Access Journals (Sweden)

    Adriana Mônica Dalla Vecchia

    Full Text Available ABSTRACT: This work presents the investigation in an environment that contains uranium deposits by using Pb isotope signatures. The study area, southeast of Brazil, is characterized by the lack of surface water and, as a consequence, the groundwater plays an important role in the economy of the region, such as the supply to the uranium industry and, above all serving the needs of the local population. The objective of the present investigation is the determination of the signatures of Pb in groundwater and sediments as well as the identification of environments under influences of geogenic and/or anthropogenic sources. It was determined that the Pb in the majority of sediments was geogenic in origin. Although data from the literature, related to the environmental studies, consider 206Pb/207Pb isotopic ratio values below or close to 1.2 as an indicative of anthropogenic Pb, the 206Pb/ 207Pb determined for the majority of groundwater samples ranged from 1.14 to 1.19, and are similar to the data reported for rocks samples (1.09 to 1.96 from area with U mineralization. It was also determined that the anthropogenic influence of the uranium was restricted to a single sampling point within the mining area.

  15. Uranium mineralization in the Lower Mahadek Sandstones of Laitduh Area, East Khasi Hills District, Meghalaya

    International Nuclear Information System (INIS)

    Mahendra Kumar, K.; Bhattacharjee, P.; Ranganath, N.

    2008-01-01

    Significant uranium mineralization hosted in feldspathic sandstone of Upper Cretaceous Lower Mahadek Formation has been located at Laitduh, East Khasi Hills district, Meghalaya. Two mineralized horizons have been identified within Lower Mahadek Formation with vertical separation of 30 m. Samples from upper horizon have assayed upto 0.17% U 3 O 8 , whereas samples from lower mineralized horizon have assayed upto 0.50% U 3 O 8 . The radioactive minerals identified are coffinite and pitchblende occurring in association with carbonaceous matter. (author)

  16. Analysis on geological setting of uranium mineralization and prospecting strategy in Lujing area, Hunan province

    International Nuclear Information System (INIS)

    Huang Hongye; Huang Sidong; Cai Songfeng

    2008-01-01

    Lujing area is an important uranium metallogenic zone in China. Based on summarizing the geological background of Lujing uranium ore-field, it is analyzed that deep origin metallogenesis, deep-seated strike-slip faults, thermal metamorphic belt and granite-porphyry play important roles in uranium mineralizatiom. It is pointed out that the NNE to NE-trending Suichuan-Reshui left-handed strike-slip fault controls directly the sedimentary characteristics, tectonic framework and uranium metallogenesis. For the discovered deposits and occurrences, it needs to study in the view of deep origin metallogenesis and ore-control by deep-seated strike-slip fault, do more further research on their evolutionary features and coupling types. It also needs to explore new types, discover new favorable area, predict and optimize the break-through prospecting target so as to make scientific assesment on the uranium resources potentialities of the ore-field and its peripheral area. (authors)

  17. New french uranium mineral species

    International Nuclear Information System (INIS)

    Branche, G.; Chervet, J.; Guillemin, C.

    1952-01-01

    In this work, the authors study the french new uranium minerals: parsonsite and renardite, hydrated phosphates of lead and uranium; kasolite: silicate hydrated of uranium and lead uranopilite: sulphate of uranium hydrated; bayleyite: carbonate of uranium and of hydrated magnesium; β uranolite: silicate of uranium and of calcium hydrated. For all these minerals, the authors give the crystallographic, optic characters, and the quantitative chemical analyses. On the other hand, the following species, very rare in the french lodgings, didn't permit to do quantitative analyses. These are: the lanthinite: hydrated uranate oxide; the α uranotile: silicate of uranium and of calcium hydrated; the bassetite: uranium phosphate and of hydrated iron; the hosphuranylite: hydrated uranium phosphate; the becquerelite: hydrated uranium oxide; the curite: oxide of uranium and lead hydrated. Finally, the authors present at the end of this survey a primary mineral: the brannerite, complex of uranium titanate. (author) [fr

  18. Discovery of uranium mineralizations in the rhyolite-granite complex in the Jabal Eghei area of southern Libya

    Directory of Open Access Journals (Sweden)

    Kovačević Jovan

    2013-01-01

    Full Text Available During investigation of the Jabal Eghei area in southern Libya and the production of geological maps at a scale of 1:250 000 (Tibesti sector, sheet Wadi Eghei NF 34-1 and NF 34-2, regional prospecting for mineral raw materials was performed. Radiometric survey of observed targets at the sites indicated two significant uranium mineralizations in rhyolites, and some smaller ones in granites that are in close contact with rhyolites. Rhyolites are located in the central part of the investigated region. They cut through granite rocks. The first mineralization is in the central part of the rhyolite region, which is mostly composed of silificated rhyolites. The second one was discovered near the granite-rhyolite contact zone, characterized by the presence of silicified breccia rocks. These findings were confirmed by laboratory measurements of more than seventy samples collected in the area, using high resolution gamma-ray spectrometry. The concentrations of uranium in these mineralizations were found to range from approx. 50 mg kg-1 to more than 600 mg kg-1. The latter value is about 240 times above the Earth’s average. Besides uranium, these measurements have also given concentrations of thorium and potassium. Additional geochemical analysis was performed on samples taken from locations where uranium anomalies were discovered using ICP-MS technique, in which concentrations of more than forty elements were determined. Uranium mineralizations are accompained by increased contents of silver (up to 17 times, arsenic (up to 8 times, molybdenum (up to 50 times, mercury (up to 9 times, and lead (up to 14 times, in regard to the Clark’s values. These results warrant a continued investigation of this region because of potential interest in the discovery of nuclear mineral raw materials.

  19. The volcanic rocks construction of the late paleozoic era and uranium mineralization in Beishan area of Gansu province

    International Nuclear Information System (INIS)

    An Zhengchang; Luo Xiaoqiang

    2010-01-01

    Late Paleozoic volcanic rocks in Beishan area are the favorable constructions of hydrothermal type and volcanic type deposit. From the distribution of volcanic rocks, the volcanic compositions, the volcanic facies, volcanic eruption method and rhythm, chemical and trace elements compositions, and so on, it discusses the characteristics of the Late Devonian volcanic construction in this area and its relationship with uranium mineralization, analyzes the role of volcanic ore-control mechanism, and summarizes uranium ore forming regularity of volcanic construction in Late Paleozoic. (authors)

  20. Study on Geology and Uranium Mineralization at Mentawa Area The Central Kalimantan

    International Nuclear Information System (INIS)

    Bambang-Soetopo

    2004-01-01

    In Mentawa Area, It was found that mineralization of U is associated with tourmaline, quartz, sulfide filling in opened fracture that parallel with schistocity WNW-ESE in direction, mm to cm in thickness, the value of radiometric is in the range of 500-11.000 e/s SPP 2 NF and maximum grade of U is 9.759,25 ppm. Goal of the study mineralogy and geology is to know about character, genesis and para genesis of the U mineralization. The method of this study is microscopic observation and microscopic study from the result of obtained by previous researchers. U mineralization is uraninite associated with molybdenite, pyrite, pyrrhotite, chalcopyrite, rutile, ilmenite and tourmaline. Based on mineral association, it was indicated that U mineralization occurred as pegmatitic pneumatholitic process. Based on those relation and mineral association it was found that Mentawa Area has occurred 4 period para genesis phase. (author)

  1. Narrative depositional systems on the area with Nalinggou the relationship between uranium mineralization

    International Nuclear Information System (INIS)

    Meng Rui

    2012-01-01

    For sandstone-type uranium deposits in China began to research the late 1950s, 1990s in-situ leachable sand stone-type uranium deposits has become China's industrial significance of the important uranium deposits type. The sedimentary system analysis in in-situ leachable sandstone-type uranium deposit research plays a very important role. Based on the sedimentary system analysis and sequence stratigraphy as the basis, the area of Nalinggou on ridge middle Jurassic straight ROM group sedimentary system characteristics, middle Jurassic straight ROM group of sand body thickness, the area on ridge aspects of river channel exhibition cloth direction studied that: (1) river space distribution direction control the sand body cloth of the spatial distribution, then affects fu cloth of the spatial distribution of uranium sand body; (2) the evolution of the sedimentary environment created a good sand sequence distribution and enrichment conditions intercalation, be helpful for interlayer oxidation effect; (3) sequence of sedimentary control three layer structure lithology space combination. (authors)

  2. A discussion on tectonic geological evolution and the distribution pattern of uranium mineralization in Langshan mountain area, inner mongolia

    International Nuclear Information System (INIS)

    Yang Fuxin

    1994-01-01

    Langshan area is an orogenic belt which consists of two lithospheric faults, three ductile shear zones and some napped structures or thrusting napped structures, developed on palaeorift in Proterozoic Era. Uranium mineralization of ductile fault rock type and other types were with metallogenetic ages being of Middle-Late Proterozoic and Late Paleozoic. Major ore-controlling and ore-concentrating structural space are ductile fractures. Based on the above mentioned, the author points out the ore-prospecting potential and direction in this area

  3. Granite-related hypothermal uranium mineralization in South China

    International Nuclear Information System (INIS)

    Liu, X.; Wu, J.; Pan, J.; Zhu, M.

    2014-01-01

    Taoshan, Xiazhuang and Nanxuiang areas, South China. Preliminary geodynamic studies reveal that hypothermal uranium mineralization in granite predominantly occurs in areas with lithospheric extension in a crust thickening geological setting. This new type of uranium mineralization in granite is now considered as the new target for future exploration. (author)

  4. Gamma-Dose rate above uranium mineralization areas in western sudan

    International Nuclear Information System (INIS)

    Sam, A.K; Sirelkhatim, D.A; Hassona, R.K.

    2003-01-01

    Absorbed dose rate received from natural external irradiation in uranium mineralisation areas at Uro, Kurun and Jebel Mun was evaluated from the measured activity concentrations of 238 U, 232 Th and 40 K in rock samples.The analyses were performed using alpha-spectrometry and high-resolution gamma-ray spectrometry. A great spatial variability was observed in activity concentration of the primordial radionuclides indicating complexity in geological features. Converses to Jebel Mun, Uro and Kurun deposits exhibit very high U:Th mass ratio. The resulting absorbed dose rate in air as estimated using DRCF's fall within the range of 70-522 (Mun), 569-349 (Uro) and 84-320 n Gy/h (Kurun). At maximum, they correspond to annual effective dose of 0.64, 7.78 and 0.39 mSv, respectively. Uranium is the principal producer of the surface radioactivity at Uro and Kurun as it contributes 99.6% and 95% of the total absorbed dose whereas, in Jebel Mun the cause of radioactive anomaly is due to 40 K and 232 Th. In Uro and Kurun deposits, daughter/parent activity ratios along uranium series, Viz. 234 U: 238 U, 230 Th:U, 210 Po:U, are not differ from the equilibrium value of unity.(Author)

  5. Lung Cancer in uranium miners

    International Nuclear Information System (INIS)

    Zhou Chundi; Fan Jixiong; Wang Liuhu; Huang Yiehan; Nie Guanghua

    1987-01-01

    This paper analyese the clinical data of 39 uranium miners with lung cancer and of 20 patients with lung cancer who have not been exposed to uranium as control. The age of uranium miners with lung cancer was 36∼61 with an average of 48.8, nine years earlier than that of the control group (57.3). In the uranium miner patients the right lung was more susceptible to cancer than the left, the ratio being 2.5:1. However, in the control group the right lung had an equal incidence of cancer as the left lung. The relative frequency of small cell anaplastic carcinoma in uranium miner was higher than that in the control group. In the miner patients the mean occupation history was 11.1 ± 5.2 years; the exposure dose to radon and its daughters in 50% patients was 0.504J(120 WLM). The etiologic factor of lung cancer in uranium miners is strongly attributed, in addition to smoking, to the exposure to radon and its daughters in uranium mines

  6. Inhalation hazards to uranium miners

    International Nuclear Information System (INIS)

    Cross, F.T.

    1983-01-01

    This project is investigating levels or uranium mine air contaminants, using both large and small experimental animals to model human respiratory system disease. Lung cancer and deaths by degenerative lung disease have reached epidemic proportions among uranium miners, but the cause-effect relationships for these diseases are based on inadequate epidemiological data. This project identifies agents or combinations of agents (both chemical and radiological), and their exposure levels, that produce respiratory tract lesions, including respiratory epithelial carcinoma, pneumoconiosis, and emphysema

  7. Inhalation hazards to uranium miners

    International Nuclear Information System (INIS)

    Cross, F.T.

    1982-01-01

    This project is investigating levels of uranium mine air contaminants, using both large and small experimental animals to model human respiratory system disease. Lung cancer and deaths by degenerative lung disease have reached epidemic proportions among uranium miners, but the cause-effect relationships for these diseases are based on inadequate epidemiological data. This project identifies agents or combinations of agents (both chemical and radiological) and their exposure levels that produce respiratory tract lesions, including respiratory epithelial carcinoma, pneumonconiosis and emphysema

  8. Inhalation hazards to uranium miners

    International Nuclear Information System (INIS)

    Cross, F.T.

    1986-01-01

    This project is investigating levels of uranium mine air contaminants, using both large and small experimental animals to model human respiratory system diseases. Lung cancer and deaths by degenerative lung disease have reached epidemic proportions among uranium miners, but the cause-effect relationships for these diseases are based on inadequate epidemiological data. This project identifies uranium mine air agents or combinations of agents (both chemical and radiological), and their exposure levels, that produce respiratory tract lesions, including respiratory epithelial carcinoma, pneumoconiosis, and emphysema. Histopathologic data from serially sacrificed rats are reported for approximately 20- to 640- working-level-month (WLM) radon-daughter exposures delivered at one-tenth the rate of previous exposures. Exposure of male rats to radon daughters and uranium ore dust continues, along with exposure of male and female beagle dogs to uranium ore dust alone

  9. Radioactivity and the French uranium bearing minerals

    International Nuclear Information System (INIS)

    Guiollard, P.Ch.; Boisson, J.M.; Leydet, J.C.; Meisser, N.

    1998-01-01

    This special issue of Regne Mineral journal is entirely devoted to the French uranium mining industry. It comprises 4 parts dealing with: the uranium mining industry in France (history, uranium rush, deposits, geologic setting, prosperity and recession, situation in 1998, ore processing); radioactivity and the uranium and its descendants (discovery, first French uranium bearing ores, discovery of radioactivity, radium and other uranium descendants, radium mines, uranium mines, atoms, elements and isotopes, uranium genesis, uranium decay, isotopes in an uranium ore, spontaneous fission, selective migration of radionuclides, radon in mines and houses, radioactivity units, radioprotection standards, new standards and controversies, natural and artificial radioactivity, hazards linked with the handling and collecting of uranium ores, conformability with radioprotection standards, radioactivity of natural uranium minerals); the French uranium bearing minerals (composition, crystal structure, reference, etymology, fluorescence). (J.S.)

  10. Inhalation hazards to uranium miners

    International Nuclear Information System (INIS)

    Cross, F.T.

    1987-01-01

    Using both large and small experimental animals, this project is investigating levels of uranium-mine air contaminants that produce respiratory system disease in miners. Lung cancer incidence and deaths from degenerative lung disease are significantly elevated among uranium miners, but the cause-effect relationships for these diseases are based on inadequate epidemiological data. This project identifies agents or combinations of agents (both chemical and radiological), and their exposure levels, that produce respiratory tract lesions, including respiratory epithelial carcinoma, pneumoconiosis, and emphysema. Histopathological data for 100-working-level (WL) exposure rates show a significant increase in lung tumor risk over 1000-WL exposure rates for comparable cumulative radon-daughter exposures. Exposure of rats to radon daughters and other contaminants continues; the exposure of beagle dogs to uranium ore dust alone was terminated. Renal function and hematology data on ore-dust-exposed dogs are reported. 1 figure, 5 tables

  11. Inhalation hazards to uranium miners

    International Nuclear Information System (INIS)

    Cross, F.T.

    1985-01-01

    This project is investigating levels of uranium mine air contaminants, using both large and small experimental animals to model human respiratory system disease. Lung cancer and deaths by degenerative lung disease have reached epidemic proportions among uranium miners, but the cause-effect relationships for these diseases are based on inadequate epidemiological data. This project identifies agents or combinations of agents (both chemical and radiological), and their exposure levels, that produce respiratory tract lesions, including respiratory epithelial carcinoma, pneumoconiosis, and emphysema. Histopathologic data from rats are shown for approximately 300- to 10,000-working-level-month (WLM) radon-daughter exposures. Exposure of male rats to radon daughters and uranium ore dust continues, along with exposure of male and female beagle dogs to uranium ore dust alone. 4 tables

  12. Radiological hazards to uranium miners

    International Nuclear Information System (INIS)

    1990-05-01

    The purpose of the present document is to review and assess the occupational hazards to uranium miners in Canada. Amendments to regulations set the maximum permissible dose to uranium miners at 50 mSv per year. Uranium miners are exposed to radon and thoron progeny, external gamma radiation and long-lived alpha-emitting radionuclides in dust. The best estimate for the lifetime risk of inhaled radon progeny is about 3 x 10 -4 lung cancers per WLM for the average miner, with a range of uncertainty from about 1 -6 x 10 -4 per WLM. This central value is nearly twice as high as that recommended by the ICRP in 1981. The probability of serious biological consequences following exposure to external gamma rays is currently under review but is expected to be in the range of 3 - 6 x 10 -2 Sv -1 . Dosimetric calculations indicate that the stochastic risks per WLM of thoron progeny are about one-third of those for radon progeny. The annual limits on intake of inhaled ore dusts recommended by the ICRP are probably too low by at least a factor of two for the type of ore and dust normally encountered in underground uranium mines in Ontario; this is due in part to the fact that the average diameter of these dusts is five times greater than the value used by the ICRP. Radiological exposures of uranium miners in Canada were reviewed. The biological impact of these exposures were compared with those of conventional accidents on the basis of the years of normal life expectancy that are lost or seriously impaired due to occupational hazards. The objectives in considering all occupational risks are to reduce the total risk from all causes and to use funds spent for health protection as effectively as possible

  13. Mesozoic-Cenozoic tectonic evolution and its relation to sandstone-type uranium mineralization in northern Tarim area--Evidence from apatite fission track

    International Nuclear Information System (INIS)

    Liu Hongxu; Dong Wenming; Liu Zhangyue; Chen Xiaolin

    2009-01-01

    The apatite fission track dating and inversion result of geological thermal history of four rock specimens from Sawafuqi area and Talike area in northern Tarim Basin show that two areas uplifted at different ages. The apatite fission track ages of Sawafuqi range from 3.5 to 3.9 Ma, while the ages of Talike range from 53 to 59 Ma. The thermal history recorded by rock samples reveals that there are at least three prominent cooling phases since Late Cretaceous epoch. Detailed study was made on the division of uplifting stages during Mesozoic and Cenozoic tectonic evolution with the existing data in northern Tarim area. And new ideas on tectonic evolution and sandstone-type uranium mineralization have been put forward by combining with the sandstone-type uranium mineralization ages in this area.(authors)

  14. The Tosudite, a clayey mineral which marks the uranium-bearing mineralisation in the Arlit area (Niger)

    International Nuclear Information System (INIS)

    Billon, S.; Beaufort, D.; Sardini, P.; Wattinne, A.

    2009-01-01

    The authors report an investigation which aims at the identification of clayey minerals in the sedimentary series of the Tim Mersoi basin in Niger, and of their petrogenetic meaning. Based on spectrometry and on chemical micro-analysis, they identify the different components of the Tosudite present in the clayey phase: a sodoite-type chlorite and a montmorillonite-type smectite. The presence of Tosudite is interpreted as the result of a post-diagenetic episode related to infiltrations of magnesium-based and oxidative solutions. The way the uranium-bearing minerals precipitated suggests that the Tosudite is a marker of a mineralisation episode

  15. Uranium mineralization in peninsular Malaysia: Current status

    International Nuclear Information System (INIS)

    Mohd Azmi Ismail; Mohd Nazran Harun

    2010-01-01

    An appraisal of the regional reconnaissance geophysical, geochemical and geological data obtained under the Central Belt Project in 1977 -1978 appeared to constitute favourable uranium exploration targets. Follow-up surveys conducted until the year 1090 have proposed the exploration area to be divided into three transect. Transect 1 covers the western part of the state of Kelantan, northwest Pahang and the eastern half of Perak. Transect 2 covers southeastern tip of Perak, west Pahang, eastern half of Wilayah Persekutuan, eastern portion of Selangor, and the northwest portion of Negeri Sembilan. Transect 3 covers central Kelantan, northwestern of Terengganu and northern portion of Pahang. Results of the study indicate that the Main Range, Bujang Melaka, and Bukit Tinggi Plutons are most fertile with uranium spectrometric rock values range from 13 to 25 ppm. Further investigation to zero down the target areas for uranium mineralization are strongly recommended over these areas. (author)

  16. On the mineralization model of 'three sources--heat, water and uranium'

    International Nuclear Information System (INIS)

    Li Xueli

    1992-01-01

    In response to the relations between geological and geothermal settings, geothermal water and uranium mineralizations in the Southeastern China, the model of uranium mineralization in discharge area (depressurization area) of fossil geothermal systems in Mesozoic-Cenozoic Volcanic-magmatic active areas has been put forward and expounded in the view of mineral-formation by the 'three sources'-heat, water and uranium

  17. The primary discuss with migmatite uranium mineralization of 505 uranium points in Datian, Panzhihua, Sichuan province

    International Nuclear Information System (INIS)

    Zhao Jianbo; Yao Jian; Li Pilin

    2012-01-01

    The Presinian migmatitic complexes of Kangding Group distributed along 505 area of Datian, Panzhihua, Sichuan Province. Describing the geological features on 505 Uranium points, summarizing and analyzing the genesis of the migmatite complexes, overall structure, hydrothermal alteration, ore characteristics. It comes to a conclusion that the mineral type is migmatite uranium mineralization which is controlled by the migmatization and east-west structure. (authors)

  18. Uranium mineralization of migmatite in southern China

    Energy Technology Data Exchange (ETDEWEB)

    Feng, Mingyue

    1987-09-01

    The uranium mineralization occurs in migmatite in the form of disseminated uraninite is a new type found in southern China. According to the forms of uraninite existence in orebodies, it can be divided into primary and reworked subtypes. The principal uranium mineral in the deposits of primary subtype is uraninite, but those in reworked subtype are pitchblende and relict uraninite. The formation of uranium mineralization is considered as a result of remobilization, migration and local concentration caused by preferential melting of the uranium-rich strata.

  19. Uranium mineralization of migmatite in southern China

    International Nuclear Information System (INIS)

    Feng Mingyue.

    1987-01-01

    The uranium mineralization occurs in migmatite in the form of disseminated uraninite is a new type found in southern China. According to the forms of uraninite existence in orebodies, it can be divided into primary and reworked subtypes. The principal uranium mineral in the deposits of primary subtype is uraninite, but those in reworked subtype are pitchblende and relict uraninite. The formation of uranium mineralization is considered as a result of remobilization, migration and local concentration caused by preferential melting of the uranium-rich strata

  20. Aspects of uranium mineralization in the Beaufort West Karoo

    Energy Technology Data Exchange (ETDEWEB)

    Pretorius, L E

    1977-01-01

    The distribution and controlling factors of uranium mineralization in the sedimentary rocks of the Lower Beaufort Group have been investigated in the Beaufort West area between 22/sup 0/O' and 24/sup 0/O'E longitude and 32/sup 0/O' and 32/sup 0/45'S latitude. The mineralization is classified as 'primary' or 'secondary', depending on the time of emplacement and not on the oxidation state of the uranium minerals present. Petrographic and geochemical aspects of primary uranium deposition point to a syngenetic origin. Reconstruction of the paleodepositional environment suggests that the primary mineralization is restricted to paleo-pools or -meander cut-offs where stagnant reducing conditions existed. From geological mapping done to the south of Beaufort West it appears that this uranium mineralization is located in an 'intermediate' paleo-depositional zone between the true fluvial and delta front environments. The indications of secondary uranium distribution and epigenetic concentration in 'rolls' within the area were studied along with various other aspects of such mineralization. The permeability of the arenaceous rocks in the area seems to be too low to host large uranium deposits of this kind. Detail geochemical soil sampling suggests that Zn, P, Co and As could be used as pathfinder elements for uranium. Although regional anomalies were investigated no meaningful pattern could be developed.

  1. Uranium in soil, forest litter and living plant material above three uranium mineralizations in Northern Sweden

    International Nuclear Information System (INIS)

    Ek, John

    1982-01-01

    In order to investigate the feasibility of biogeochemical sampling media in uranium exploration, samples from the most common trees and low bushes together with forest litter were collected over the areas of three uranium mineralizations in Northern Sweden and analyzed for uranium. The results were compared with uranium content of the till and its radioactivity. The average uranium content was low for all sample types and considerably lower in the ash of the organic sample types compared to that of the till. No sample type showed any tendency of having higher uranium concentration above mineralizations compared to background areas. These results suggest that, under conditions prevailing in Sweden, the investigated sample types are not suitable for uranium exploration

  2. The discussion on the relationship between high-resolution sequence stratigraphy and uranium mineralization of Zhiluo formation in Dongsheng area, ordos basin

    International Nuclear Information System (INIS)

    Chen Xiaolin; Xiang Weidong; Li Tiangang; Fang Xiheng; Pang Yaqing

    2007-01-01

    According to the data of drill cores, outcrops and well logging, two orders base-level cycles are recognized from Zhiluo Formation in Dongsheng area, which consist of 8-14 short-term base-level cycles and 3 mid-term base-level cycles, and their structural types and stacking patterns are discussed by using principles and methods of high-resolution sequence stratigraphic theory. Based on the correlation of mid-term base-level cycles, the control of the A/S (Accommodation/Sediment supply) ratio in mid-term base-level cycles on the scale of sand bodies and physical properties of reservoir is analysed. Studies show that the sand bodies of braided stream in MSC1 of Zhiluo Formation are favourable to uranium mineralization, however, the sand bodies of meandering river in MSC2 and MSC3 are not favourable to uranium mineralization. The change of the A/S results in the difference in characters of sand body, such as physical properties, continuity and so on, which control the fluid flowing path. After discussing the immigration of uranium-bearing oxidizing ground water in the braided channel sand bodies, the paper tries to present the answers to the question of why the host orebody occurs mainly in the middle and upper sand body which the lower limb is thicker than the upper limb in the limb orebodies. (authors)

  3. Uranium mineralization in the Bohemian Massif and its exploration

    International Nuclear Information System (INIS)

    Matolin, M.; Pluskal, O.; Rene, M.

    1981-01-01

    Long-term systematic and planned uranium survey including airborne, carborne, ground, logging and laboratory radiometric measurements as well as geological and geochemical investigations have shown a difference in radioactivity of two regional geological units in Czechoslovakia. The higher regional radioactivity of the Variscan granitoid rocks of the Bohemian Massif differs from that of the West Carpathians and is associated with more frequent uranium mineralization. Endogenous vein-type uranium mineralization has a spatial association with high-radioactivity granitoids in the Bohemian Massif. Airborne prospection defined rock radioactivity features on a regional scale while surface and subsurface radiometric and geological investigations using various techniques localized important uranium deposits. Complex statistical evaluation of numerous geophysical and geological data was studied in order to delineate uranium-favourable areas. (author)

  4. Genetic aspects of uranium mineralization in the Himalaya

    International Nuclear Information System (INIS)

    Saraswat, A.C.; Mahadevan, T.M.

    1989-01-01

    The Himalayan Uranium Province hosts five major types of uranium mineralization: (1) stratiform remobilized (Proterozoic), (2) structurally controlled hydrothermal (Proterozoic), (3) black shale-phosphorite (Palaeozoic-Mesozoic), (4) sandstone (Siwalik belt, Tertiary), and (5) primary disseminations in granitoids (Tertiary). Evaluation of the genetic aspects of these types has led to the identification of distinct spatial (lithostratigraphic and tectonic units) and temporal relations among them. The sandstone types are confined to the Tertiary (Middle Miocene to Pleistocene) molasse formations found south of th Main Boundary Thrust (MBT). Between the MBT and the Main Central Thrust, in the Lesser Himalaya, mineralization hosted in the Chail quartzite-phyllite ± metabasic sequences is of stratiform remobilized type. The structurally controlled hydrothermal type is confined to Dalings and gneisses. Syngenetic uranium in black shale-phosphorite sequences of Palaeozoic-Mesozoic age is found on the southern fringes of the Lesser Himalaya, bordering the MBT. Disseminated uranium occurs in the Tertiary and Proterozoic(?) granitoids of the Greater Himalaya and Ladakh. Rb-Sr geochronological data on host rocks and U-Pb dates on uraninites from some areas indicate that uranium mineralization in stratiform remobilized and structurally controlled types hosted by the Chails, Dalings and gneisses is essentially Precambrian and thus existed much before the Himalayan Orogeny. The Himalayan Orogeny, however, appears to have aided in further remobilization. The sandstone type mineralization in the Siwalik, on the other hand, is directly related to the process of formation of the foredeep and molasse sedimentation and subsequent uplift and epigenesis of the uranium mineralization, all of which are directly relatable to the evolution of the Himalaya. The relevance of deep seated lineament structures to mineralization, particularly of uranium, needs to be evaluated critically, as most

  5. Ore-concentrating structures with telescoped uranium mineralization

    International Nuclear Information System (INIS)

    Shchetochkin, V.N.; Dmitriyev, V.I.; Tkachenko, I.I.

    1986-01-01

    Deep faults are the main controlling elements in uranium ore fields, although the immediate geologic environments may be quite varied. Within the fault zones, the uranium fields are usually associated with areas where major transverse and diagonal faults intersect or link, and with points of splitting or change in strike in disjunctive zones. Another distinctive feature of the mineralized structure is their long history, with a combination of tectonic elements differing in age and type, usually associated with retrograde dislocation metamorphism. The specific features of these structures control the uranium mineralization, which is usually localized in foci with telescoped tectonic, magmatic, hydrothermal, metasomatic, and sometimes exogenous processes. The unnamed area (in the Ukraine?) furnishes a good example of how successive stages of a complex geologic history affect the occurrence of such a highly mobile element as uranium. 12 references, 4 figures

  6. Conditions and potential evaluation of the uranium mineralization in volcanic basins at the west section of the Yanliao mineral belt

    International Nuclear Information System (INIS)

    Wang Zhengbang; Zhao Shiqin; Luo Yi; Zhou Dean; Xiao Xiangping

    1993-03-01

    The West section of the Yanliao Mineral Belt is an important prospective uranium mineralization area in volcanic basins at North China. It has undergone three evolutionary periods and developed into six large volcanic collapse faulted basins with tri-layer structure. This leads to three times of pre-enrichment and multiple mineralization of uranium. Finally, the accumulation of uranium and superimposed reworked actions of uranium mineralization resulted in the formation of uranium deposits. After analyzing conditions of uranium mineralization, a model for uranium mineralization of mixed hydrothermal solution of multiple sources in penetrating volcanic collapse faulted basins and seven exploring criteria are suggested. On this basis the evaluation of prospect in this area is positive, and the main exploring strategy has been decided. Furthermore, five prospective areas of mineralization and three most favorable mineralization zones are selected. For exploring large size or super-large size uranium deposits in the area, the key is to strengthen the study and boring of deep layers. Thus, the mineralization in the deep layers or basement may be found. The prediction of deep blind deposits in known ore districts has been proved effectively

  7. Uranium in the Bunter sediments of the Polish area

    International Nuclear Information System (INIS)

    Saldan, M.; Strzelecki, R.

    1980-01-01

    Uranium mineralization occurring in the Triassic sediments in the Polish area is discussed. Systematic work conducted for over ten years revealed the presence of uranium mineralization in the following geological units: Peribaltic syneclize, Fore-Sudetic monocline, Zary pericline and Pomerania trough. Out of three uranium-bearing horizons which can be correlated with each other two (the lower and the middle) are connected with the Middle Bunter, while the upper horizon is related to the Upper Bunter. Mineralization was found in sandstones, conglomerates, mudstones and claystones and, in the Fore-Sudetic monocline, also in carbonates. Among uranium minerals uranium black and coffinite were identified. In addition to uranium, increased vanadium, selenium and molybdenum contents were found in the sandstones. Some of the uranium-bearing horizons are of economic value. (author)

  8. Leukaemia and lymphoma among Czech uranium miners

    International Nuclear Information System (INIS)

    Tomasek, L.; Malatova, I.

    2006-01-01

    Leukaemia is one of the most sensitive cancers in relation to ionizing radiation. It is surprising that in studies of uranium miners, no risk of leukaemia in relation to cumulated radon exposure was observed (Darby et al, 1995). However, when the risk among Czech uranium miners was analyzed in dependence on duration of exposure, the trend was significant. These results were based on 10 cases (Tomasek, 1993). Since then the original cohort of 4320 miners has been extended by another cohort, now including nearly 10 000 uranium miners and the follow-up is longer by 10 years. The present report aims to analyze the risk of haemopoietic cancers in the Czech cohort accounting for both external and internal doses, similarly as reported by Jacobi and Roth (1995), and using available data on metal content and airborne particulates for dose estimates.The present results of follow-up show that increased risk of leukaemia among uranium miners is significantly associated with cumulated equivalent red bone marrow doses which is dominated by exposures to long lived alpha radionuclides in airborne particulates. The increased mortality is mainly observed decades after exposure and is consistent with estimated internal dose to red bone marrow. The estimated risk coefficient for leukaemia is consistent with results from other studies, however, further studies are needed to reduce uncertainty in the risk estimates. (N.C.)

  9. Leukaemia and lymphoma among Czech uranium miners

    Energy Technology Data Exchange (ETDEWEB)

    Tomasek, L.; Malatova, I. [National Radiation Protection Institute, Prague (Czech Republic)

    2006-07-01

    Leukaemia is one of the most sensitive cancers in relation to ionizing radiation. It is surprising that in studies of uranium miners, no risk of leukaemia in relation to cumulated radon exposure was observed (Darby et al, 1995). However, when the risk among Czech uranium miners was analyzed in dependence on duration of exposure, the trend was significant. These results were based on 10 cases (Tomasek, 1993). Since then the original cohort of 4320 miners has been extended by another cohort, now including nearly 10 000 uranium miners and the follow-up is longer by 10 years. The present report aims to analyze the risk of haemopoietic cancers in the Czech cohort accounting for both external and internal doses, similarly as reported by Jacobi and Roth (1995), and using available data on metal content and airborne particulates for dose estimates.The present results of follow-up show that increased risk of leukaemia among uranium miners is significantly associated with cumulated equivalent red bone marrow doses which is dominated by exposures to long lived alpha radionuclides in airborne particulates. The increased mortality is mainly observed decades after exposure and is consistent with estimated internal dose to red bone marrow. The estimated risk coefficient for leukaemia is consistent with results from other studies, however, further studies are needed to reduce uncertainty in the risk estimates. (N.C.)

  10. Uranium mineralization in the Molteno and Elliot Formations

    International Nuclear Information System (INIS)

    Le Roux, J.P.

    1990-01-01

    To date very little has been published on the uranium deposits of the Molteno and Elliot Formations. Two selected deposits from these formations are described and compared to the uranium occurrences of the Beaufort Group. Whereas the latter are generally confined to channel zones due to the fine grain size and impermeable nature of the host sandstones, uranium in the Molteno and Elliot Formations seems to be concentrated in the less permeable 'island' areas. An apparent association with dolerite sills and dykes also suggests that the host sandstones were still sufficiently permeable after intrusion of the dolorite so that ground waters could remobilize the uranium. This agrees with recently published isotopic ages for the mineralization. There is a distinct possibility that roll-type uranium deposits may be present in the Molteno and Elliot Formations, and any future exploration should bear this in mind. 9 figs., 1 tab., 16 refs

  11. Raw data from orientation studies in crystalline rock areas of the southeastern United States. [Maps, tables of field data and analytical data for sections of North and South Carolina and Georgia, previously reported sites of uranium mineralization

    Energy Technology Data Exchange (ETDEWEB)

    Price, V.

    1976-03-01

    Raw data are presented on orientation studies conducted in crystalline rock areas of the Southeast which were chosen because of published references to uranium mineralization. Preliminary data for four orientation study areas are included. These areas are Lamar County, Georgia; Oconee County, South Carolina; Brush Creek, North Carolina; and North Harper, North Carolina. Sample locality maps, tables of field data, and tables of analytical data are included for each study area. (JGB)

  12. Occurrence of tephra/volcanic tuff in the tertiary sediments of Himachal Himalaya from Tileli area, Mandi district, H.P.: implication for stratigraphy and uranium mineralization

    International Nuclear Information System (INIS)

    Pandey, Pradeep; Chabbra, Jyotsana; Joshi, G.B.; Parihar, P.S.

    2014-01-01

    Presence of Early Tertiary pyroclastic material (tephra) has been documented petrographically, for the first time, in the Mandi-Bilaspur Sector from Tileli area, Dharamsala basin of Himachal Pradesh. The tephra is reported from the red shale, identified as tuffaceous siltstone belonging to lower Dharamsala Formation that lies above the uraniferous sandstone body and occurs as thin layers of over 300m along the strike, close to the contact of lower and upper Dharamsala formations. The tuffaceous material shows crude but preferred orientation of minerals like biotite, muscovite, chlorite, clay, hematite and specularite. Various features indicating presence of tephra are, glass shards altered to clay but retaining 'U' shaped outline, spindle-shaped hematite with preferred orientation, spherical to sub-spherical clay and altered Fe oxide rich balls, clay groundmass with flow pattern, flaky minerals in association with clast depicting asymmetrical ramp structure. A zone of approximately 300 m length containing tuffaceous material has been established at Tileli overlying the uraniferous sandstone body. Identification of tephra at Tileli has significant implications as it enabled in demarcating the boundary between the upper and lower Dharamsala formations in central part of the basin in Bilaspur-Mandi Sector of HP Himalaya and also in guiding the uranium exploration programme in the lower Dharamsala Formation. (author)

  13. Uranium miner lung cancer study. Final report

    International Nuclear Information System (INIS)

    Saccomanno, G.

    1986-06-01

    This study on uranium miners was started in 1957 and extended through June 30, 1986. It consisted of the routine screening of sputum from uranium miners of the Colorado Plateau, and collection of surgical and autopsy material from uranium miners who developed lung cancer. The projects resulted in: (1) Proof, for the first time, that cancer takes from 10 to 15 years to develop from the maximum accumulated carcinogenic insult and can be demonstrated through progressive cellular changes of the bronchial tree; (2) Development of a method for preserving, concentrating, and processing sputum samples. This is known as the Saccomanno Technique, and is used worldwide in diagnosing lung cancer; (3) Publication of the 1st and 2nd editions of a full-color textbook entitled ''Diagnostic Pulmonary Cytology;'' (4) Presentation of conclusive data on the effects of cigarette smoking and alpha progeny radiation on uranium miners, and information on safe radiation exposure levels; (5) Development of a brush-wash tube for collecting, concentrating, and preparing bronchial brushings and washings; (6) Development of cytological criteria which has improved sensitivity from 30% to about 60%; (7) Development of criteria for cytologic identification of carcinoma in situ, making it possible to diagnose lung cancer before it can be detected on chest x-ray

  14. Uranium metallogenic features and prospecting potentialities in the areas around Shabazi uranium deposit in Nanling metallogenic belt

    International Nuclear Information System (INIS)

    Yang Shanghai

    2008-01-01

    Based on the actuality of exploration and research on Shabazi uranium deposit in Nanling metallogenic belt, the author analyzes and summarizes uranium metallogenic features of the deposit. Under the direction of modern metallogenic theories of uranium deposit, such as deep-source mineralization and deep prospecting for uranium deposits, it is shown that there is great mineralization and prospecting potentiality in the areas around Shabazi uranium deposit and high attention importance should be paid to the areas in the future exploration according to the synthetical analysis on geologic background of the deposit, uranium mineralization features, ore-controlling factors and systematic data of geology. (authors)

  15. Lead as a pathfinder for uranium mineralization

    International Nuclear Information System (INIS)

    Shouls, M.M.

    1983-01-01

    The theoretical aspects of the formation of radiogenic lead anomalies from uranium and thorium mineralization are discussed in the light of differing mobilities of the parent elements and the stable lead daughter. It is concluded that recognizable lead anomalies can persist in the weathered tops of ancient uranium deposits, and such anomalies can be identified from the stable lead isotope ratios. In addition, with mixed U-Th mineralization lead isotopic ratios may be identified after most of the uranium has been leached away. The theoretical models also include possible additions of entrained lead with the mineralization and its effects on the isotopic ratios. This reasoning was tested in the evaluation of a radiometric anomaly in northern Malawi where a discrepancy between the U and eU values suggested a uranium-depleted mixed U-Th deposit. However, the partly coincident lead anomaly did not fit the isotope models proposed in the first part of the paper, and they indicated an unexpectedly young age. The anomaly was therefore downgraded but the adequacy of the theory was not tested. (author)

  16. Study of Grants, new Mexico, uranium miners: current status

    International Nuclear Information System (INIS)

    Samet, J.M.; Morgan, M.V.; Buechley, R.W.; Key, C.R.; Valdivia, A.A.

    1981-01-01

    The Uranium Epidemiology Study at the University of New Mexico was initiated in 1977 with the objective of assessing health effects of uranium mining in the Grants, New Mexico, area. The planned approach was a cohort study of mortality that would capitalize on the availability of health records at the Grants Clinic. The first year's work confirmed the study's feasibility (Buechley, 1979). Subsequent efforts have focused on the health and exposure data base and comprehensive follow-up. A retrospective cohort study of early miners is in progress; a prospective cohort study of miners who began working under the current federal standard is planned. This report will summarize the current status of the Uranium Epidemiology Study

  17. Heavy mineral survey for uranium in the Philippines

    International Nuclear Information System (INIS)

    Tauchid, M.; Santos, G. Jr.; Hernandez, E.; Bernido, C.

    1983-01-01

    A reconnaissance geochemical survey for uranium was carried out in the island of Samar in the Philippines covering an area of about 13,000 km 2 . The survey represents the first practical demonstration in the country of the use of geochemical techniques to outline large possibly interesting areas within a short period and with modest monetary expenditure. The survey entailed the systematic collection of 1530 heavy mineral concentrates, stream sediments and water samples, and the measurement of radioactivity at 510 stations along the major drainage system of Samar. The average sampling density was 1/20-25 km 2 . All solid samples were analysed for U, Cu, Pb, Zn, Mn, Ag, Co and Ni. Uranium, radon, conductivity and pH were measured in most of the water samples collected. More than 9000 chemical determinations were made. Results of the survey clearly point to the usefulness of heavy mineral sampling at the low density level of observation. The non-magnetic fraction of the heavy mineral concentrates outlined strong and well defined areas of interest for most of the elements analysed. Stream sediment sampling at this sampling density indicated weaker, less clearly defined anomalies. Uranium and radon analyses performed on stream water samples and ground scintillometer readings provided invaluable complementary information relevant to the evaluation of the island's uranium potential. (author)

  18. Analysis on uranium resource situations and metallogenic potential of Heyuan mineralization belt of Guangdong province

    International Nuclear Information System (INIS)

    Chen Zhuhai; Zheng Mingliang; Song Shizhu; Liang Yewu; Zhao Wei

    2008-01-01

    Heyuan mineralization belt is a structure-magmatic activities belt which is charcterized by strong plastic deformation and shearing. The squeeze (overthrust) structure is formed early. Later stretch produced slide shovel-shaped normal fault which control the red basin and uranium mineralization. Comprehensive study shows that this area is of favorable uranium metallogenic condition due to the rich uranium source and higher degree of geology work, it is a target for the new round resources exploration. (authors)

  19. Remote sensing based geology interpretation and uranium mineralization prediction in Janchivlan, Mongolia

    International Nuclear Information System (INIS)

    Yang Guofang; Lin Ziyu

    2014-01-01

    Remote sensing technology and high resolution satellite image were used to interprete the geologic information in Janchivlan, Mongolia. Mineralization condition information related uranium such as rocks and strata, faults, hydrothermal alteration were studied. By information extraction and target recognition from ALOS and ETM image, Devonian was found to be composed of two lithological units. The double token-ring structures in the midwest of study area were closely related to uranium metalization period of magmatic activity. According to the relationship of the comprehensive information and uranium mineralization, favorable metallogenic target was predicted in the study area, which was useful to uranium prospecting in the study area. (authors)

  20. Mode of distribution of uranium mineralization and sequence of the formation of minerals in albitites

    International Nuclear Information System (INIS)

    Grechishnikov, N.P.; Kramar, O.A.; Rapovich, F.I.

    1985-01-01

    On the basis of analysis and generalization of factural material data on the distribution nature of accessory uranium mineralization in albitites permitting to judge of the role and textural-structural peculiarities of enclosing rocks in mineralization localization are given. It is shown that the uranium mineral formation is closely related with the albitite formation and proceeded during two stages. A main mass of primary uranium minerals (brannerites and uraninites) in the form of impregnated mineralization was formed during the first uraninite-brannerite-albitite stage. Uranium oxides, silicates and titanates in the shape of veines formed. During the second coffinite-pitchblende-chloritic stage the formation of uranium oxides, silicates and titanates occured. Uranium mineralization in albitites developes in zones of cataclasm, small jointing, mylonitization localizing in fine-grained aggregates. A main mass of primary uranium minerals in albitites (brannerite, uraninite relates to neogenic during metasomatosis dark-coloured minerals (riebenite, aegirine, chlorite)

  1. On dynamics of uranium vein mineralization

    International Nuclear Information System (INIS)

    Petrosyan, R.V.

    1981-01-01

    The formation of urnaium vein deposits and the essence of consanguinity of the mineralization and wall metasomatites are considered. The formation of uranium mineralization is analysed from the positions of Korzhinsky D. S. : the formation of metasomatite aureole and associated vein ores take place as a result of the development of one solution flow while the formation of mineral vein associations occurs on the background of contineous filtration of the solution during metasomato is due to a repeated (pulse) half-opening of fractures and their filling with a part of filtrating solution. The analysis of the available information on the example of two different uranium manifestations permits to reveal certain relations both in the character of wall rock alterations and between the metasomatosis and the formation of ore minerals in veins. The conclusion is made that spatial-time correlations of vein formations with wall metasomatites attest that the pulse formation of ores in veinlets occurs on the background and in interrelation with a consecutive precipitation of components in the aureole volume. The analysis of element migration dynamics in wall aureole carried out from the positions of the Korzhinsky hypothesis of the advance wave of acid components that takes into account the interaction of continuous and pulse mechanisms of solution movement permits to avoid contradictions when interpreting the processes of wall rock alterations and vein ore-forming, and permits to make a common scheme of vein ore-genesis [ru

  2. New french uranium mineral species; Nouvelles especes uraniferes francaises

    Energy Technology Data Exchange (ETDEWEB)

    Branche, G; Chervet, J; Guillemin, C [Commissariat a l' Energie Atomique, Lab. du Fort de Chatillon, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

    1952-07-01

    In this work, the authors study the french new uranium minerals: parsonsite and renardite, hydrated phosphates of lead and uranium; kasolite: silicate hydrated of uranium and lead uranopilite: sulphate of uranium hydrated; bayleyite: carbonate of uranium and of hydrated magnesium; {beta} uranolite: silicate of uranium and of calcium hydrated. For all these minerals, the authors give the crystallographic, optic characters, and the quantitative chemical analyses. On the other hand, the following species, very rare in the french lodgings, didn't permit to do quantitative analyses. These are: the lanthinite: hydrated uranate oxide; the {alpha} uranotile: silicate of uranium and of calcium hydrated; the bassetite: uranium phosphate and of hydrated iron; the hosphuranylite: hydrated uranium phosphate; the becquerelite: hydrated uranium oxide; the curite: oxide of uranium and lead hydrated. Finally, the authors present at the end of this survey a primary mineral: the brannerite, complex of uranium titanate. (author) [French] Dans ce travail, les auteurs etudient les nouveaux mineraux uraniferes francais: parsonsite et renardite, phosphates hydrates de plomb et d'uranium; kasolite: silicate hydrate d'uranium et de plomb uranopilite: sulfate d'uranium hydrate; bayleyite: carbonate d'uranium et de magnesium hydrate; {beta} uranolite: silicate d'uranium et de calcium hydrate. Pour tous ces mineraux, les auteurs donnent les caracteres cristallographiques, optiques, et les analyses chimiques quantitatives. Par contre, les especes suivantes, tres rares dans les gites francais, n'ont pas permis d'effectuer d'analyses quantitatives. Ce sont: l'ianthinite: oxyde uraneux hydrate; l'{alpha} uranotile: silicate d'uranium et de calcium hydrate; le bassetite: phosphate d'uranium et de fer hydrate; la hosphuranylite: phosphate duranium hydrate; la becquerelite: oxyde d'uranium hydrate; la curite: oxyde d'uranium et de plomb hydrate. Enfin, les auteurs presentent a la fin de cette etude

  3. Uranium in tertiary stream channels, Lake Frome area, South Australia

    International Nuclear Information System (INIS)

    Brunt, D.A.

    1978-01-01

    Uranium exploration over a wide area of the Southern Frome Embayment, South Australia, has defined a number of Lower Tertiary fluvial palacochannels incised in older rocks. The buried channels contain similar stratigraphic sequences of interbedded sand, silt, and clay, probably derived from the adjacent uranium-rich Olary Province. Uranium mineralization is pervasive within two major palacochannels, and four small uranium deposits have been found in the basal sands of these channel sequences, at the margins of extensive tongues of limonitic sand. A genetic model is proposed suggesting formation by a uraniferous geochemical cell which migrated down the stream gradient and concentrated uranium on its lateral margins adjacent to the channel bank

  4. Granite-related Hypothermal Uranium Mineralization in South China

    International Nuclear Information System (INIS)

    Liu Xiaodong; Wu Jianhua; Pan Jiangyong; Zhu Mingqian

    2014-01-01

    Moer and more evidence indicates that there are multi-stages uranium mineralization in many granite-related uranium deposits in south China. The early stage mineralization shares the characters of hypothermal U mineralization and had close relations to alkaline alterations.

  5. Cancer epidemiology in respiratory system among uranium miners

    International Nuclear Information System (INIS)

    Moraes, A.

    1976-11-01

    A summary of some published papers about cancer in respiratory system among uranium miners is presented. A comparative table relating cancer cases among uranium miners is shown. A table relating cases among miners in Checoslovaquia and cumulative exposure levels due to radon daughter products is also given [pt

  6. Geochemical characteristics of Wulunguhe Formation oxidation zone and its relation to uranium mineralization in Dingshan area, Junggar basin

    International Nuclear Information System (INIS)

    Xin Xiu; Xu Qiang; He Zhongbo

    2014-01-01

    The paper mainly analyzes and compares major elements, trace elements and REE in the phreatic oxidation zone and interlayer oxidized zone of Wulunguhe Formation in Dingshan area, Junggar basin. Characters of major elements and trace elements indicate that argillation and carbonatization and correlation of U, V and Mo in the phreatic oxidation zone are stronger than those in the interlayer oxidized zone. Conclusion from REE is as follows: there are congruent origins of sedimentation, depositional setting and tectonic setting. Differentiation of LREE and HREE and alterations in phreatic oxidation zone are more obvious than those in the interlayer oxidized zone. Negative anomaly of Eu in the interlayer oxidized zone is more obvious than that in the phreatic oxidation zone. (authors)

  7. Respiratory disease mortality among uranium miners

    International Nuclear Information System (INIS)

    Archer, V.E.; Gillam, J.D.; Wagoner, J.K.

    1976-01-01

    A mortality analysis of a group of white and Indian uranium miners was done by a life-table method. A significant excess of respiratory cancer among both whites and Indians was found. Nonmalignant respiratory disease deaths among the whites are approaching cancer in importance as a cause of death, probably as a result of diffuse parenchymal radiation damage. Exposure-response curves for nonsmokers are linear for both respiratory cancer and ''other respiratory disease''. Cigaret smoking elevates and distorts that curve. Light cigaret smokers appear to be most vulnerable to lung parenchymal damage. The predominant histologic cancer among nonsmokers is small-cell undifferentiated, just as it is among cigaret smokers

  8. Lung Cancer of the Uranium Miners

    International Nuclear Information System (INIS)

    Kiselev, M.F.; Shandala, N.K.; Gneusheva, G.I.; Seregin, V.A.; Kiselev, S.M.; Semenova, M.P.

    2012-01-01

    Full text: 'The Priargun Production Mining and Chemical Association' (hereinafter referred to as PPMCA) is the only world diversified mining company, which, in addition to underground mining of uranium ore, carries out refining of such ores in hydrometallurgical process to produce natural uranium oxide. The paper deals with the evaluation of the occupational morbidity of the PPMCA's miners depending on their work conditions. In order to evaluate radiological risks of the malignant neoplasm incidence, we used the available medical-dosimetry data being received over the Association life. Our study covers information of 584 miners. The main part of this group includes men (87%), involved in uranium mining (sinkers, timber-men, etc.). Women accounted 13%, being involved in subsidiary works. The highest mean external doses (20 - 40 mSv/year) got those, who worked in the mines over 1980-1983, but the number of this subgroup is small - 18 persons. Generally, mean doses over next years were about 5 mSv/year. However, almost each year, maximum doses above 20 mSv/year can be observed. Internal doses to men were 42.9 mSv on average, while those to women were 23.9 mSv. When generating the medical database, we collected data of 130 mail mines, employed to the PPMCA mines. Among all cases of the malignant neoplasm incidence of miners, the highest contribution is made by the lung cancer (46%); this is well above the national data (23.3 %). The second part is digestive tract cancer (the stomach, the lower lip, and pancreas), contributing 29 % in total, and the stomach cancer contributes 16 %. Depositions of these malignancies do not exceed the national data. The problem of the further work improvement of the miners to eliminate occupational lung disease in the uranium mining operations remains important to the present. Epidemiological and radio-ecological studies will help both regulators and operators to make more objective assessment of each specific situation and to determine

  9. Uranium

    International Nuclear Information System (INIS)

    Poty, B.; Cuney, M.; Bruneton, P.; Virlogeux, D.; Capus, G.

    2010-01-01

    With the worldwide revival of nuclear energy comes the question of uranium reserves. For more than 20 years, nuclear energy has been neglected and uranium prospecting has been practically abandoned. Therefore, present day production covers only 70% of needs and stocks are decreasing. Production is to double by 2030 which represents a huge industrial challenge. The FBR-type reactors technology, which allows to consume the whole uranium content of the fuel, is developing in several countries and will ensure the long-term development of nuclear fission. However, the implementation of these reactors (the generation 4) will be progressive during the second half of the 21. century. For this reason an active search for uranium ores will be necessary during the whole 21. century to ensure the fueling of light water reactors which are huge uranium consumers. This dossier covers all the aspects of natural uranium production: mineralogy, geochemistry, types of deposits, world distribution of deposits with a particular attention given to French deposits, the exploitation of which is abandoned today. Finally, exploitation, ore processing and the economical aspects are presented. Contents: 1 - the uranium element and its minerals: from uranium discovery to its industrial utilization, the main uranium minerals (minerals with tetravalent uranium, minerals with hexavalent uranium); 2 - uranium in the Earth's crust and its geochemical properties: distribution (in sedimentary rocks, in magmatic rocks, in metamorphic rocks, in soils and vegetation), geochemistry (uranium solubility and valence in magmas, uranium speciation in aqueous solution, solubility of the main uranium minerals in aqueous solution, uranium mobilization and precipitation); 3 - geology of the main types of uranium deposits: economical criteria for a deposit, structural diversity of deposits, classification, world distribution of deposits, distribution of deposits with time, superficial deposits, uranium

  10. Indochina area mineral prospects

    Energy Technology Data Exchange (ETDEWEB)

    1990-10-05

    Prospects for commercial mining of various minerals are considered for Kampuchea (Cambodia), Laos, Vietnam, Myanmar (Burma) and Thailand. Mineral production is much below its geologic potential for economic and political reasons. Resource potential is limited to tin, tungsten, lead and zinc, barytes and gemstones, and coal. 1 fig.

  11. Uranium mineralization environment and prospecting potential of Dawan ore field in Nanling metallogenic belt

    International Nuclear Information System (INIS)

    Yang Shanghai

    2011-01-01

    Located in the middle part of Jiuyishan complex pluton, Nanling metallogenic belt, Dawan uranium ore field in Hunan Province is an important uranium-producing and rare metal, nonferrous metal cluster area due to the favourable mineralization environment. The Cambrian is the main uranium source bed and their contact zone to the pluton is the favorable part for mineralization. The uranium deposits which have been explored are all located in the exocontact zone of Jinjiling pluton in the middle part of Jiuyishan complex pluton which is composed of the independent eastern and western magma evolution centers. In the west center, Jinjiling pluton is closely related to uranium mineralization where the trinity geologic setting was formed with magma evolution, hydrothermal fluid action and mineralization. The deep slitted and large faults provide the pathway and thermodynamic source for circulating migration of mineralizing fluid. The uranium mineralization mainly occurred in crustal stress conversion period of Late Cretaceous and related to the tensive NW extending fault and deep originated fluid. The gravity, aero magnetic, airborne gamma-ray spectrometry anomalies and radioactivity hydrochemical anomaly are important criteria for uranium prospecting. Based on the analysis of regional uranium mineralization environment, the prospecting potential is forecasted. (authors)

  12. Genesis of carbonate-siliceous-pelitic type uranium deposits in Baoyuan area

    International Nuclear Information System (INIS)

    Guo Baochi; Zhang Daishi; Li Shengxiang; Zhu Jiechen

    1995-01-01

    Based on systematic studies of the regional geology, the fundamental geological characteristics of uranium mineralizations, and according to the researches of uranium source, the REE characteristics, the H,O,C,S isotope compositions, as well as the chronology of uranium metallogenesis of the uranium deposits, the authors consider that the multistage accumulative metallogenesis (especially the hydrothermal superimposed and reworking metallogenesis) is the universal and important uranium metallogenesis in the formation of carbonate-siliceous-pelitic type uranium deposits in the area

  13. Fluid inclusions in minerals associated to uranium mineralization in Jazida do Engenho (anomaly 09), Lagoa Real uranium province - Bahia, Brazil

    International Nuclear Information System (INIS)

    Souza, Aurelio da Silva de

    2009-01-01

    The Engenho deposit (anomaly 09) is south-eastern from Cachoeira Mine (anomaly 13), in the northern part of the Province. The uranium mineralization is associated to 'albitites' (over 70% of albite/oligoclase). Epidosites with uranium may also occur. The 'albitite' main minerals are pyroxene, gamet, albite/oligoclase feldspar, amphibole and biotite. Pyroxene, gamet, plagioclase, titanite and epidote are the minerals associated to the uranium mineralization. The fluids related to pyroxene, gamet and epidote are aqueous-saline, primary and with no carbonic phases and are constant, with small variations. They all present medium to high salinity (14 to 18wt% NaCl eq.), the higher values being related to pyroxene and the lower ones related to gamet and epidote. The fluids associated to albite/oligoclase, although aqua-saline and with no carbonic phases, show salinities much lower than in pyroxene, gamet and epidote, suggesting a intense dilution process indicating dilution toward the later minerals phases. The data suggest the pyroxene formation process occurring under a 3,5 kbar pressure condition which corresponds to approximately 10km depth. The dispersion on Th in albites, due probably to the overheating and non elastic increase in volume, precluded a reliable pressure calculation. The IF's microscopy m plagioclase gneiss (albitites host-rocks) suggests the probability of primary carbonic fluids associated to these minerals. The fluids with CO 2 showed in the gneiss maybe also be present in the albitites, probably as late or intergranular fluids. This assumption is based on the fact that signs of carbonic gases were shown during crushing tests. These tendencies suggest the occurrence of two albitization phases in this Lagoa Real area: one associated to a fluid composed by H 2 O + CO 2 + salts (in the gneiss host) and another (in the albitite) formed by an aqueous-saline phase. The data indicate the Brasiliano event as a thermal event without a predominant fluid

  14. Microbes: uranium miners, money makers, problem solvers

    International Nuclear Information System (INIS)

    Williamson, A.L.; Payne, R.; Kerr, F.; Hall, S.; Spiers, G.A.

    2010-01-01

    Bioleaching, the microbial dissolution of minerals, is potentially useful in exploiting a variety of ore deposits, including the lower-grade uraniferous quartz-pebble conglomerate beds of the Quirke Syncline, Elliot Lake, Ontario. The metabolism of chemolithotropic bacterium Acidithiobacillus ferrooxidans is dependent on its ability to derive energy and reducing power from the oxidation of ferrous iron. The characteristics of this bacterium, in particular the ability to oxidize both iron and sulphur with an associated high tolerance of low acidity, allow the organism to contribute significantly to bioleaching processes. Under ideal conditions, A. ferrooxidans promotes the oxidation of iron-containing sulphide ore materials, breaking their crystal structure and promoting the dissolution of iron, base metals, as well as uranium, rare earth elements and associated elements of toxicological interest such as arsenic and selenium. The current study documents an overview of the recovery of uranium and rare earth elements to solution, plus investigates the acid generating potential of the solid residues from a series of environmentally controlled, biologically-mediated uranium ore extraction experiments. The findings will be used in the design of larger scale bioleaching experiments to further assess the potential for success of bioleaching as a metallurgical extraction technique potentially leading to minimum maintenance decommissioning strategies for the ore deposits of the Quirke Syncline. (author)

  15. Microbes: uranium miners, money makers, problem solvers

    Energy Technology Data Exchange (ETDEWEB)

    Williamson, A.L., E-mail: awilliamson@mirarco.org [MIRARCO, Sudbury, ON (Canada); Laurentian Univ., Sudbury, ON (Canada); Payne, R.; Kerr, F. [Pele Mountain Resources Inc., Toronto, ON (Canada); Hall, S. [Laurentian Univ., Sudbury, ON (Canada); Spiers, G.A. [MIRARCO, Sudbury, ON (Canada); Laurentian Univ., Sudbury, ON (Canada)

    2010-07-01

    Bioleaching, the microbial dissolution of minerals, is potentially useful in exploiting a variety of ore deposits, including the lower-grade uraniferous quartz-pebble conglomerate beds of the Quirke Syncline, Elliot Lake, Ontario. The metabolism of chemolithotropic bacterium Acidithiobacillus ferrooxidans is dependent on its ability to derive energy and reducing power from the oxidation of ferrous iron. The characteristics of this bacterium, in particular the ability to oxidize both iron and sulphur with an associated high tolerance of low acidity, allow the organism to contribute significantly to bioleaching processes. Under ideal conditions, A. ferrooxidans promotes the oxidation of iron-containing sulphide ore materials, breaking their crystal structure and promoting the dissolution of iron, base metals, as well as uranium, rare earth elements and associated elements of toxicological interest such as arsenic and selenium. The current study documents an overview of the recovery of uranium and rare earth elements to solution, plus investigates the acid generating potential of the solid residues from a series of environmentally controlled, biologically-mediated uranium ore extraction experiments. The findings will be used in the design of larger scale bioleaching experiments to further assess the potential for success of bioleaching as a metallurgical extraction technique potentially leading to minimum maintenance decommissioning strategies for the ore deposits of the Quirke Syncline. (author)

  16. Primary uranium mineralization in paleochannels of the Um Bogma formation at Allouga Southwestern Sinai

    International Nuclear Information System (INIS)

    Bisher, A. H.

    2012-12-01

    The Um Bogama formation in the Allouga area is within a major Graben trending NNW-SSE. The formation is composed mainly of sandy dolostone. Lactomicin marl, siltstone and carbonaceous shale with a high content of organic matter. The black carbonaceous shale represents the redox-front (reduced facies) at which hexavalent uranium can reduce to the presence state, resulting in the redeposition of uranium mineral. The presence of uranium minerals are increased with an increasing amount of carbonaceous matter in the paleochannels of the Allouga area. Small-scale fault planes also show an increase in the uranium content. The present study reveals the presence of the primary uranium contents, uranium, pitch blends and coffinite, which are recorded for the first time in the area. (Author)

  17. Uranium mineralization at Lagoa Real, BA, Brazil: the role of fluids in its genesis

    International Nuclear Information System (INIS)

    Prates, Sonia Pinto; Neves, Jose Marques Correia; Fuzikawa, Kazuo

    2009-01-01

    The Lagoa Real uranium province is situated in the central-south of Bahia state . Brazil and it is presently by far the most important and best known uranium occurrence in Brazil. Nowadays 34 anomalies are known in a 30 Km long and 5 km wide area. An open pit mine was open in Cachoeira Mine, in the north portion of the area, and it is the only uranium mine in operation in Brazil and even in South America as well. The uranium mineralization in the Lagoa Real uranium province occurs in metamorphic rocks named albitites, due to their albite content (over 70%). Uraninite is the main uranium mineral, followed by pechblende, uranophane, torbernite and other uranyl minerals. Uraninite occurs as tiny round and irregular crystals (20 a 30 μm) included or associated to mafic minerals, mainly pyroxene and garnet, and also to amphibole and biotite and sometimes to albite. Some secondary minerals such as, for instance, uranophane, torbernite and tyuyamunite are also found. The main albitites minerals from the Cachoeira mine (plagioclase, garnet, biotite, pyroxene, amphibole and titanite) were studied by means of Infrared Spectroscopy Techniques. Good results were obtained from small quantities of material (around 2 mg) and allowed the minerals identification, and also to know their composition (from the peak position) and to detect the presence of water molecules, which indicates an aqueous phase during the uranium formation, probably rich in Fluorine. (author)

  18. Uranium Sequestration by Aluminum Phosphate Minerals in Unsaturated Soils

    International Nuclear Information System (INIS)

    Jerden, James L. Jr.

    2007-01-01

    A mineralogical and geochemical study of soils developed from the unmined Coles Hill uranium deposit (Virginia) was undertaken to determine how phosphorous influences the speciation of uranium in an oxidizing soil/saprolite system typical of the eastern United States. This paper presents mineralogical and geochemical results that identify and quantify the processes by which uranium has been sequestered in these soils. It was found that uranium is not leached from the saturated soil zone (saprolites) overlying the deposit due to the formation of a sparingly soluble uranyl phosphate mineral of the meta-autunite group. The concentration of uranium in the saprolites is approximately 1000 mg uranium per kg of saprolite. It was also found that a significant amount of uranium was retained in the unsaturated soil zone overlying uranium-rich saprolites. The uranium concentration in the unsaturated soils is approximately 200 mg uranium per kg of soil (20 times higher than uranium concentrations in similar soils adjacent to the deposit). Mineralogical evidence indicates that uranium in this zone is sequestered by a barium-strontium-calcium aluminum phosphate mineral of the crandallite group (gorceixite). This mineral is intimately inter-grown with iron and manganese oxides that also contain uranium. The amount of uranium associated with both the aluminum phosphates (as much as 1.4 weight percent) has been measured by electron microprobe micro-analyses and the geochemical conditions under which these minerals formed has been studied using thermodynamic reaction path modeling. The geochemical data and modeling results suggest the meta-autunite group minerals present in the saprolites overlying the deposit are unstable in the unsaturated zone soils overlying the deposit due to a decrease in soil pH (down to a pH of 4.5) at depths less than 5 meters below the surface. Mineralogical observations suggest that, once exposed to the unsaturated environment, the meta-autunite group

  19. Formation conditions of uranium minerals in oxidation zone of uranium deposits

    International Nuclear Information System (INIS)

    Li Youzhu

    2005-01-01

    The paper concerns about the summary and classification of hydrothermal uranium deposit with oxidation zone. Based on the summary of observation results of forty uranium deposits located in CIS and Bulgaria which are of different sizes and industrial-genetic types, analysis on available published information concerning oxidation and uranium mineral enrichment in supergenic zone, oxidation zone classification of hydrothermal uranium had been put forward according to the general system of the exogenetic uranium concentration. (authors)

  20. Study on geochronology and uranium source of sandstone-type uranium deposit in Dongsheng area

    International Nuclear Information System (INIS)

    Liu Haibin; Xia Yuliang; Tian Shifeng

    2007-01-01

    This paper studied the geochronology of sandstone-type uranium deposit in the Dongsheng area of Ordos Basin. In eastern segment, ages of mineralization at the wing of the ore-roll are found to be 120 ± 5 Ma and 80 ± 5 Ma, and at the front of the ore-roll are 20 ± 2 Ma and 8 ± 1 Ma; While in middle segment, ages of mineralization are 124 ± 6 Ma and 80 ± 5 Ma. This means that the main mineralization in Dongsheng area were formed at early Jurassic and late Cretaceous, and correspondent to the time of structure uplift. Mineralization of roll-front (rich ore) which formed in Miocene and Pliocene may related to tectonic-thermal event taken place at that time and reformed the early mineralization in this area. The isochron line age of sample with uranium grade 0 ) in the sandbody is 24.64 x 10 -6 also shows the uranium pre-concentration in the strata. The even value of ΔU of rocks in Zhiluo formation is -70.2%, this shows that non-mineralized rocks have migrated uranium and acted as important metallogenic uranium sources. (authors)

  1. Methods of mineral potential assessment of uranium deposits: A mineral systems approach

    International Nuclear Information System (INIS)

    Jaireth, S.

    2014-01-01

    Mineral potential represents the likelihood (probability) that an economic mineral deposit could have formed in an area. Mineral potential assessment and prospectivity analysis use a probabilistic concepts to mineral deposits, where the probability of an event (formation of a mineral deposit) is conditional on two factors : i) geological processes occurring in the area, and ii) the presence of geological features indicative of those process. For instance, one of the geological processes critical for the formation of sandstone-hosted uranium deposits in an area is transport of uranium in groundwaters. Geological features indicative of this process in an area comprise, i) presence of leachable source rocks of uranium; ii) presence of highly permeable sandstone; and iii) suitable hydrogeological gradient driving flow groundwaters. Mineral deposits can also be conceptualised as mineral systems with more emphasis on mineralising processes. This concept has some clear parallels with the petroleum systems approach which has proven to be a useful in oil and gas exploration. Mineral systems are defined as ‘all geological factors that control the generation and preservation of mineral deposits’. Seven important geological factors are outlined to define the characteristics of a hydrothermal mineral system. These factors include: i) source of the mineralising fluids and transporting legends; ii) source of metals and other ore components; iii) migration pathways which may include inflow as well as outflow zones; iv) thermal gradients; v) source of energy to mobilised fluids; vi) mechanical and structural focusing mechanism at the trap site; and vii) chemical and/or physical cause for precipitation of ore minerals at the trap site. This approach, commonly known as the ‘source’, ‘transport’ and ‘trap’ paradigm has been redefined to introduce five questions as a basis to understand spatial and temporal evolution of a mineral system at all scales (regional to

  2. Behavior of Colorado Plateau uranium minerals during oxidation

    Science.gov (United States)

    Garrels, Robert Minard; Christ, C.L.

    1956-01-01

    Uranium occurs as U(VI) and U(IV) in minerals of the Colorado Plateau ores. The number of species containing U(VI) is large, but only two U(IV) minerals are known from the Plateau: uraninite, and oxide, and coffinite, a hydroxy-silicate. These oxidize to yield U(VI) before reacting significantly with other mineral constituents. Crystal-structure analysis has shown that U(VI) invariable occurs as uranyl ion, UO2+2. Uranyl ion may form complex carbonate or sulfate ions with resulting soluble compounds, but only in the absence of quinquevalent vanadium, arsenic, or phosphorous. In the presence of these elements in the +5 valence state, the uranyl ion is fixed in insoluble layer compounds formed by union of uranyl ion with orthovanadate, orthophosphate, or orthoarsenate. Under favorable conditions UO2+2 may react to form the relatively insoluble rutherfordine, UO2CO3, or hydrated uranyl hydroxides. These are rarely found on the Colorado Plateau as opposed to their excellent development in other uraniferous areas, a condition which is apparently related to the semiarid climate and low water table of the Plateau. Uranium may also be fixed as uranyl silicate, but little is known about minerals of this kind. In the present study emphasis has been placed on a detailing of the chemical and crystal structural changes which occur in the oxidation paragenetic sequence.

  3. Relative estimation of the mineral ages using uranium migration

    International Nuclear Information System (INIS)

    Danis, A.

    1990-01-01

    Using the uranium fission track micro mapping technique the correlation between the age and uranium migration from inclusions was studied. It is shown that during geological time, as function of the mineral, its age and its uranium migration speed, the pattern of the track, clusters corresponding to the uranium inclusions got a typical feature. Thus for a bulk polished geological sample it is possible to establish an age succession of the constituent minerals as a function of the track cluster patterns. Also, it is shown that knowing the migration speed of the uranium in a mineral it is possible to estimate the age of this mineral by measuring the migration distance on the micro mapping. (Author)

  4. Research on structure-alteration zone related to uranium mineralization and its exploration significance

    International Nuclear Information System (INIS)

    Huang Xianfang; Liu Dechang; Ye Fawang; Dong Xiuzhen; Yang Xu Zhang Hongguang

    2008-01-01

    The paper is focused on recommending geological characteristics of structure-alteration zone which is found from image interpretation in Bashibulake District, north of Tarim Basin, expounding remote sensing information enhancement and extraction technique, analyzing image feature, genetic mechanism and discussing the relationship between uranium mineralization and structure-alteration zone. A new discovery is raised through applying remote sensing information analysis and geologic analysis, that is, the uranium deposits in Bashibulake District are controlled by structure-alteration zone. The new understanding provides a new view point for reconsidering main controlling factors and uranium mineralization distribution in the area. It is helpful for further reconnaissance and exploration in the area. (authors)

  5. Depositional environments as a guide to uranium mineralization in the Chinle formation, San Rafael Swell, Utah

    International Nuclear Information System (INIS)

    Lupe, R.

    1977-01-01

    The sedimentary textures resulting from depositional processes operating in low-energy environments appear to have influenced uranium mineralization. The Chinle consists of three fining-upward, fluvial-lacustrine sequences. Uranium minerals are concentrated in the lower part of the lowest sequence in areas where sediments of low-energy environment are complexly interbedded with sediments of other environments. Areas favorable for uranium exploration exist in the subsurface to the north, west, and south of the Chinle outcrop in the Swell. This determination is based on the spatial distribution of depositional environments and the pattern of Chinle deposition through time. 8 refs

  6. Uranium mineralization possibilities in metamorphic Massif of Isla de Juventud, Cuba

    International Nuclear Information System (INIS)

    Gongora Dominguez, L.E.; Llanes Castro, A.I.; Pena Fortes, B.; Capote Rodriguez, G.

    1996-01-01

    The geologic and metallogenic characteristic of the metamorphic Massif shows the presence of possible uranium vein type mineralization as a result of a hidrotermal genetic process. Metalliferous fluids rising along the fault system were responsible for the deposition of the uranium in the reduction zones, i.e. presence of pyrite, organic matter and others. This type of uranium minerization is proposed for the Bibijagua area and for the Revolucion and Lela area the same type is expected. The gamma spectrometric analysis was used to evaluate the geological samples

  7. Uranium mineralization by ground water in sedimentary rocks, Japan

    International Nuclear Information System (INIS)

    Doi, K.; Hirono, S.; Sakamaki, Y.

    1975-01-01

    To solve the mechanism of uranium concentration in stratabound uranium deposits occurring in the basal part of Neogene sediments overlying granite basement, attention was paid to uranium leaching from weathered granite by circulating carbonated fissure waters, to effective adsorbents for fixing uranium from uraniferous ground waters, to structural features controlling the ground-water circulation, and other relevant factors. The evidence for uranium transportation by hydothermal solutions, including hot spring waters, is hard to observe. Conclusions are summarized as follows: Uranium in the deposits is supplied from surrounding source rocks, mostly from granite. Uranium is transported by circulating ground-water solutions. The uranium dissolved in ground water is fixed in minerals in various ways, the most important being adsorption by carbonaceous matter. Ore-grade uranium concentrated from very dilute solutions occurs by multiple repetition of a leaching-and-fixation cycle between minerals or adsorbents and circulating uraniferous ground water. Important factors for uranium mineralization are sufficient uranium, supplied mostly from granite, the existence of effective adsorbents such as carbonaceous matter in the host rocks, and favorable geological, geochemical, and geophysical environments. The last seem to require not only physical and chemical conditions but also correct flow and volume of ground water. (U.S.)

  8. Relation between uranium mineralization and structural features, Gebel Gattar, north eastern desert, Egypt

    International Nuclear Information System (INIS)

    Salman, A.B.; Shalaby, M.H.; Abuzaid, M.M.; Ragab, A.

    1998-01-01

    Gebel Gattar area is situated in the northern Eastern Desert of Egypt, SW Hurghada city and is considered as an area of high potentialities for uranium deposits. The area is covered by Hammamat sediments and Gattarian granites. The Hammamat sediments are dissected by different types of dykes, while Gebel Gattar granites are cut only by basic dykes. These granites are mentioned as the younger pink granites, perthitic leucogranites, calc-alkaline and within plate granites. The structural deformations of the study area are represented by primary structures and secondary ones. The most prevailing structures are folding, faulting and jointing. The faults, especially those trending in the NNE-SSW and N-S directions played as pass ways to the ascending uranium-bearing hydrothermal solutions carrying uranium mineralizations. Most of them are located within a large pull apart basin. It is found from the relation between structures and uranium mineralization within the highly pro missing shear zones that uranium mineralizations are located within a large pull-apart basin, having about 2 km length and 0.5 km width. This idea is based up on the distribution of uranium mineralized lenses as shown in a block diagram. This conclusion is based on the structural framework of the area, the shape of mineralization and its distribution and their mutual relationships of Gl, Gll and GVl shear zones

  9. VEIN-TYPE URANIUM MINERALIZATION IN THE EASTERN DESERT OF EGYPT

    Directory of Open Access Journals (Sweden)

    M. M. Ghoneim

    2018-03-01

    Full Text Available Vein type uranium deposits where uranium minerals fill cavities veins, fractures, fissures, pore spaces, shear zone, breccia and stockworks in igneous, meta-sediments and metamorphic rocks are common source of uranium mineralization all over the wold. In Egypt, El-Erediya, El-Missikat and El Sela uranium mineralization occur in younger granite plutons in the Eastern Desert of Egypt. These plutons are considered as good examples of intra-granitic vein-type uranium mineralization. The goal of this review article is to study the characteristics of granites and Th-U vein mineralization El Sela area. Main tasks are characteristics of vein type uranium mineralization in the world and Egypt, characteristics of ore-bearing intrusive rocks in the El Sela area, mineralogy of Th-U vein-type mineralization in El Sela area and secondary U and Th minerals in granites. Results. The article revealed that El Sela granite is a peraluminous, high-K Calc-Alkaline (HKCA granite. Two-mica leucogranitic pluton is considered the source rock of U-mineralization at El-Sela area, while the altered microgranite and dolerite dikes are good traps for these mineralizations. The reactivated faults system trending ENE-WSW and NNW-SSE make favorable condition to form uranium mineralization associated with polymetallic mineralization that are redeposited in the two mica granite, microgranite and dolerite dikes. The metallic mineral assemblages in the veins mainly consist of pyrite, chalcopyrite, galena, sphalerite and fluorite that are associated with primary (uraninite, coffinite and secondary U-mineralization (uranophane and autunite that occur either as disseminated clusters or as microfracture filling and coating joint surface. Five types of thorite-group minerals can be distinguished: thorite, Zr-rich thorite, phosphothorite, uranothorite and Zr-rich uranothorite. ThO2 content of uraninite vary from (1.1 to 3 wt.%, for PbO contents from 1.16 to 2.35 wt.%, P2O5 contents from

  10. Analysis of genomic instability in bronchial cells from uranium miners

    International Nuclear Information System (INIS)

    Neft, R.E.; Belinsky, S.A.; Gilliland, F.D.; Lechner, J.F.

    1994-01-01

    Epidemiological studies show that underground uranium miners have a radon progeny exposure-dependent increased risk for developing lung cancer. The odds ratio for lung cancer in uranium miners increase for all cumulative exposures above 99 Working Level Months. In addition, there is a strong multiplicative effect of cigarette smoking on the development of lung cancer in uranium miners. The purpose of this investigation was to determine whether or not early genetic changes, as indicated by genomic instability, can be detected in bronchial cells from uranium miners. Investigations of this nature may serve as a means of discovering sub-clinical disease and could lead to earlier detection of lung cancer and a better prognosis for the patient

  11. Flotation process of lead-, copper-, uranium-, and rare earth minerals

    International Nuclear Information System (INIS)

    Broman, P.G.; Kihlstedt, P.G.; Du Rietz, C.

    1977-01-01

    This invention relates to a flotation process of oxide or sulfide ores containing lead-, copper-, uranium-, and rare earth minerals applicating a new collector. Flotation is in the presence of a tertiary amine

  12. Characteristics of uranium mineralization and depositional system of host sediments, Bayantala basin, Inner Mongolia autonomous region

    International Nuclear Information System (INIS)

    Zhu Minqiang; Wu Rengui; Yu Dagan; Chen Anping; Shen Kefeng

    2003-01-01

    Based upon the research of basin fills at the Bayantala basin, the genetic facies of host sediments have been ascertained and the target beds and their range are delineated. The sand bodies of the Upper Member of Tengge'er Formation deposited in fan delta front is favorable to the formation of uranium mineralization of phreatic-interlayer oxidation. The Saihantala Fm deposited in fluvial system can be divided into Lower Member and Upper Member based on depositional microfacies and paleoclimate. The Lower Member of braided system is the most important target bed enriched in organic matter where basal-channel-type uranium mineralization occurs. Features of alteration and mineralization suggest that the early-stage and the late-stage uranium mineralization are related to phreatic oxidation and interlayer oxidation (roll-type) respectively. Meanwhile, the secondary reduction has superimposed over the earlier mineralization in the area caused by hydrocarbons raising along faults

  13. Concentration mechanisms of uranium in the mineralized fractures of the Lower Devonian of the Belgian Ardennes - The case of the Oizy area

    International Nuclear Information System (INIS)

    Charlet, J.M.; Doremus, P.; Quinif, Y.

    1987-01-01

    During a reconnaissance survey for uranium in the Belgian Paleozoic several anomalies or U occurrences have been discovered in the Lower Devonian by a car-borne radiometric survey. These anomalies appear in relation with mobilization and reconcentration processes at the boundary of redox fronts or following alteration fronts in the detrital series of the Lower Devonian. This paper describes the Oizy anomaly which occurs in a fracturated zone of the Gedinnian formations of the Ardenne Anticline and puts it back in the general context of the U concentrations of the Lower Devonian of the Belgian Ardennes. After a lithostratigraphic, structural and radiometric study of the quarry where the U concentrations occur, a laboratory study of the surrounding rocks has been performed by various techniques (γ- and α-spectrometry, X-ray diffraction, autoradiography and low-level counting technique, analytical chemistry). One can conclude that the mineralized fractures of Oizy are due to a downward remobilization of U by subsurface processes during post-Hercynian periods. 26 refs.; 11 figs.; 1 plate; 2 tabs

  14. Metamorphic history at Lagoa Real: implications for uranium mineralization

    International Nuclear Information System (INIS)

    Lobato, L.M.

    1987-01-01

    Metasomatism and attendant mineralization associated with shear zones have beem recently studied in detail by several investigators. It has emerged from these studies that whereas ground preparation by shearing is essential to the percolation of mineralizing solutions, the ultimate Loci of mineralization reflect chemical controls via fluid/rock interactions. Uranium mineralization at Lagoa Real can be conveniently understood through this perspective. (E.G.) [pt

  15. Discussion on the genesis and mineralization of sandstone type uranium deposit in the southern-central Longchuanjiang basin, western Yunnan province

    International Nuclear Information System (INIS)

    Cai Yuqi; Li Mangen

    2002-01-01

    The author mainly discusses the character of the depositional systems, geological structures and ore-bearing series in the south-central Longchuanjiang basin, and points out that the uranium mineralization is closely related to the two depositional discontinuities caused by the tectonic evolution. Based on the characteristics of uranium mineralization in the area, pitchblende, uranium blacks and phosphuranylite are discovered in No. 382 uranium deposit and radiometric super-micro-minerals in No. 381 deposit. The research on the uranium mineralization age in No. 382 deposit shows that the mineralization in the south-central part of the basin has genetically multi-staged

  16. Histologic findings in the tracheobronchial tree of uranium miners and non-miners with lung cancer

    International Nuclear Information System (INIS)

    Auerbach, O.; Saccomanno, G.; Kuschner, M.; Brown, R.D.; Garfinkel, L.

    1978-01-01

    The remaining tissue of the tracheobronchial tree from 210 men who died from lung cancer was studied to compare the histologic alterations leading to further sites of primary cancer. These men were uranium miners matched with nonminers for age and smoking habits. In the examination of a total of 28,928 cross-sections carcinoma in situ was found in 96 percent of the miners and in 92 percent of the nonminers. The number of slides from miners showing degree 2 or 3 atypia in areas of carcinoma in situ was about double the number found from the nonminers. Although the difference was not statistically significant, 32 percent of the miners had at least one section showing early primary invasive carcinoma compared with 22 percent of the nonminers. The data indicate that the synergistic effect of the exposure to uranium dust along with cigarette smoking increases the risk of lung cancer and that in addition to a main tumor mass, other sites of tissue alterations leading to tumor development are frequently already present in the lung

  17. Geology and uranium mineralization in Sarana sector, Kalan, West Kalimantan based on drilling data

    International Nuclear Information System (INIS)

    Sartapa; I Gde Sukadana

    2011-01-01

    Favourable zone of uranium mineralization in Sarana sector with NE-SW direction are contained in metapelite rock and some in muscovite quartzite. Mineralization of uranium is occurred fill in the fields of parallel fractures with stochasticity by ENE-WSW direction, and moderate to strong inclination to the north. Three points drilling with the depth of 126.6, 174.50, and 150.90 meter has been conducted. This study is aimed to obtain the knowledge of geology, and geometry of sub-surface uranium mineralization. Geologically, research area are consists of metapelite, muscovite quartzite and biotite quartzite with milli metric - centi metric thicknesses. Uranium mineralization are in forms of veins or tabular as uraninite and pitchblende associated with pyrite, chalcopyrite, pyrrhotite, ilmenite and molybdenite. Uranium Mineralization on the surface could be correlated with sub-surface from bore-hole data, with the result that zone of uranium mineralization in lenses or tabular form with sub-vertical dip may be identified. (author)

  18. Methodological Study on Dose Reconstruction for Uranium Miners in China (invited paper)

    International Nuclear Information System (INIS)

    Zhang, Y.; Yang, J.; Ma, J.; Zhou, J.; Li, X.; Yang, M.; Wang, W.

    1998-01-01

    Occupational exposure of uranium miners is very important in the nuclear industry. The individual dose to the miners in the earlier times in China suffers from a lack of information. To reconstruct the individual doses of uranium miners, a retrospective method was developed, the integration of annual effective working time and annual average alpha potential energy in working areas is used to calculate the individual dose to the miner by this method. In order to verify the validation of the method, some experiments were carried out in a uranium mine. Both internal and external individual doses received by the selected miners were monitored with individual dosemeters, area monitoring was also conducted: meanwhile, the working time and working places of the selected miners were recorded clearly. The result shows that the retrospective method can be used to estimate the collective dose and the dose level of miners with an unfixed working area in the mine, but there is a large difference between the results of the retrospective method and the monitoring result when the method is used to estimate the individual dose of miners with a relatively fixed working area. On the other hand, the collective dose and individual dose estimated according to the clearly recorded working history of the miners and alpha potential energy closely agree with the individual monitoring result. Based on the result, the importance of clearly recording the working history of the miners and area monitoring has been indicated when the individual monitoring of miners is inadequate. A simplified method with acceptable uncertainty has also been suggested to estimate the individual dose of uranium miners. (author)

  19. Mineral dusts and radon in uranium mines

    International Nuclear Information System (INIS)

    Abelson, P.H.

    1991-01-01

    The Environmental Protection Agency (EPA) continues to assert that radon is a major cause of lung cancer in this country. EPA is fostering a radon program that could entail huge financial and emotional costs while yielding negligible benefits to public health. Justification for the program was the occurrence of lung cancer in men exposed to huge amounts of radon, mineral dusts, and other lung irritants in uranium mines on the Colorado Plateau. Lung cancer has been reported in about 356 cigarette smokers and in about 25 nonsmokers. During the era of high radon levels, monitoring was sporadic. Conditions in only a small fraction of the mines were measured, and that on a few separate occasions. Later, cumulative exposure to radon was calculated on the basis of measurements involving only a tiny fraction of the miners. Some were exposed to more than 15,000 pCi/liter of radon and its products. The level in the average home is about 1.5 pCi/liter. In making extrapolations from mine to home, the assumption is made that residents are in their dwellings most of the time and that miners spend only 170 hours a month in the mine. Two major questionable assumptions are involved in extrapolations from high doses of radon in the mines to low doses in homes. One is that no threshold is involved; that is, that humans have no remediation mechanism for α particle damages. There is evidence to the contrary. The most unrealistic assumption is that heavy exposure to silica has no effect on inducing lung cancer. Many studies have shown that silica dust causes lung cancer in animals. Exposure of human culture cells to silica has resulted in formation of neoplastic tissue. EPA has no solid evidence that exposures to 4 pCi/liter of radon causes lung cancer in either smokers or nonsmokers. Indeed, there is abundant evidence to the contrary in the fact that in states with high levels of radon, inhabitants have less lung cancer than those in states with low levels

  20. The precambrian crustal evolution and mineralization cycle of uranium in the northeast of norern China platform

    International Nuclear Information System (INIS)

    Guo Zhitian.

    1986-01-01

    According to the evolution history of the crust the region is divided into three Precambrian structural structural units: (1) Archaean craton; (2) Early Proterozoic zone of fold; (3) Middle-late Proterozoic depression zone. The Archaean-craton mainly consists of granite complex and metasediments. They form the first generation of uranium sources. Proterozoic is characterized by the obvious cycle of sedimentation which consists of the second generation of uranium source. There were multiplestage and congenetic nature in the formation of uranium deposit. The mineralization of uranium coincides with geotectonicdeveloping stage -- igneous activity -- metamorphism in their time. The formation of uranium deposits generally underwent the weathering and erosion of original uraniferous bodies-the migration, redeposition and reformed concentration by metamorphism and metamorphosed hydrothermal solution, and the mineralization was not only of intermittence, but also of inheritance. The evolutional process of forming uranium deposits undergoing various geological function of a structural cycle in the uranium geochemical anomalous area is called uranium mineralizational cycle. The Northeast of Northern China Platform had undergone multiple times structural movements causing migration and concentration of uranium and having mutiple cycle mineralizational character. Corresponding to the three main developing stages of the crustal evolution the Precambrian uranium mineralization in the Northeast of northern China platform area may be divided into three cycles: Late Archaeozoic mineralizational cycle, Early Proterozoic mineralizational cycle, and Middle Proterozoic mineralizational cycle. It is possible to search for potential uranium metallogenetic provinces to study the crustal evolution and the multiple cycle characters of uranium minerogenetic process in the Northern China platform

  1. 300 Area Uranium Stabilization Through Polyphosphate Injection: Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Vermeul, Vincent R.; Bjornstad, Bruce N.; Fritz, Brad G.; Fruchter, Jonathan S.; Mackley, Rob D.; Newcomer, Darrell R.; Mendoza, Donaldo P.; Rockhold, Mark L.; Wellman, Dawn M.; Williams, Mark D.

    2009-06-30

    The objective of the treatability test was to evaluate the efficacy of using polyphosphate injections to treat uranium-contaminated groundwater in situ. A test site consisting of an injection well and 15 monitoring wells was installed in the 300 Area near the process trenches that had previously received uranium-bearing effluents. This report summarizes the work on the polyphosphate injection project, including bench-scale laboratory studies, a field injection test, and the subsequent analysis and interpretation of the results. Previous laboratory tests have demonstrated that when a soluble form of polyphosphate is injected into uranium-bearing saturated porous media, immobilization of uranium occurs due to formation of an insoluble uranyl phosphate, autunite [Ca(UO2)2(PO4)2•nH2O]. These tests were conducted at conditions expected for the aquifer and used Hanford soils and groundwater containing very low concentrations of uranium (10-6 M). Because autunite sequesters uranium in the oxidized form U(VI) rather than forcing reduction to U(IV), the possibility of re-oxidation and subsequent re-mobilization is negated. Extensive testing demonstrated the very low solubility and slow dissolution kinetics of autunite. In addition to autunite, excess phosphorous may result in apatite mineral formation, which provides a long-term source of treatment capacity. Phosphate arrival response data indicate that, under site conditions, the polyphosphate amendment could be effectively distributed over a relatively large lateral extent, with wells located at a radial distance of 23 m (75 ft) reaching from between 40% and 60% of the injection concentration. Given these phosphate transport characteristics, direct treatment of uranium through the formation of uranyl-phosphate mineral phases (i.e., autunite) could likely be effectively implemented at full field scale. However, formation of calcium-phosphate mineral phases using the selected three-phase approach was problematic. Although

  2. Geology and potential of the formation of sandstone type uranium mineralization at Hatapang region, North Sumatera

    International Nuclear Information System (INIS)

    Ngadenin

    2013-01-01

    The Study based on geological setting of Hatapang region, North Sumatera, identified as a favourable area to the formation of sandstone type uranium mineralization. This characterized by the occurred of anomalous radioactivity, uranium contents of the upper cretaceous granite intrusions and radioactivity anomalous of tertiary sedimentary rocks deposited in terrestrial environments. The study is objective to find out the potential formation of sandstone type-uranium mineralization within tertiary sedimentary rocks based on data’s studies of geological, geochemical, mineralogy, radioactivity of rocks. Stratigraphy of Hatapang area of the oldest to youngest are quartz units (permian-carboniferous), sandstone units (upper Triassic), granite (upper cretaceous), conglomerate units (Lower –middle Miocene) and tuff units (Pleistocene). Hatapang’s granite is S type granite which is not only potential as source of radioactive minerals, particularly placer type monazite, but also potential as source rocks of sandstone type-uranium mineralization on lighter sedimentary rocks. Sedimentary rock of conglomerate units has potential as host rock, even though uranium did not accumulated in its rocks since the lack number of carbon as precipitant material and dissolved U"+"6 in water did not reduced into U"+"4 caused the uranium mineralization did not deposited. (author)

  3. Uranium fixation by mineralization at the redox front

    International Nuclear Information System (INIS)

    Isobe, Hiroshi

    1998-01-01

    The behavior of actinide elements including uranium in geomedia is controlled by redox conditions. Under the oxidized conditions, uranium forms uranyl ion (UO 2 2+ ) and its complexes, and dissolves in ground water. Under the reduced conditions, U(IV) has much lower solubility than uranyl ion. In the Koongarra uranium deposit, Australia, lead-bearing uraninite, uranyl lead oxide and uranyl silicate minerals occur in the unweathered, primary ore zone, and uranyl phosphate minerals occur in the weathered, secondary ore zone. Between unweathered and weathered zones, the transition zone exists as a redox front. In the transition zone, graphite and sulfide minerals react as reducing agents for species dissolved in ground water. By SEM, spherical grains of uraninite were observed in veins with graphite. Pyrite had coffinite rim with crystals of uraninite. Calculation based on the ground water chemistry and hydrology at Koongarra shows that the uranium in the transition zone may be fixed from the ground water. In the Koongarra transition zone, recent mineralization of uranium by reduction takes place. Mineralization is much stronger fixation mechanism than adsorption on clay minerals. Pyrite in the buffer materials of possible radioactive waste repositories can fix radionuclides in oxidized ground water by mineralization with reducing reactions. (author)

  4. The determination of phosphorus in uranium minerals and resulting solutions

    International Nuclear Information System (INIS)

    Petrement Eguiluz, J. C.; Parellada Bellod, R.; Fernandez Cellini, R.

    1964-01-01

    Interferences of several elements present in Spanish uranium minerals in the phosphorus determination by the spectrophotometrical method of the molibdovanada te phosphoric acid are studied. A method is described with a previous separation of these element by a cationic resin. This method is successfully applied to the phosphorus determination in acid or alkaline lixiviation solutions of uranium minerals, as well as in the evaluates of ion exchange resins used used technically for the concentration of solutions with a low uranium content. (Author) 11 refs

  5. Study geology and uranium mineralization of ririt-amir engkala - tiga dara sector West Kalimantan

    International Nuclear Information System (INIS)

    Bambang Soetopo

    2009-01-01

    The results of previous research from Ririt, Amir Engkala, Tiga Dara sector which consist of geology, geophysics and drilling data show that all of the areas has similar in geology and Uranium mineralization. The purpose of this study is to know the relationship between geological condition and Uranium mineralization in Ririt, Amir Engkala and Tiga Dara sector. In general the geology of Ririt and Amir Engkala is similar with Tiga Dara sector. Those areas consist of tourmaline quartzite, muscovite quartzite, meta ignimbrite, biotite quartz schist, muscovite quartz schist, and micro diorite. The direction of the stratification is NE - SW and dipping to SE and the direction of the stochasticity is W - E and dipping to N. The dextral faults have WNW-ESE and NNE - SSW trends, while the sinistral one is WSW - ENE direction. There are also a thrust fault and a normal fault with WSW-ESE and NW-SE striking respectively. Uranium mineralization as a uraninite fill in the stochasticity and fracture N2600-30° E37°-59° in orientation which associated with magnetite, chalcopyrite, pyrite, arsenopyrite,. rutile, ilmenite, tourmaline and quartz. Radiometric value of Uranium mineralization is in the range of 500-15.000 c/s. The mineral association and the present of calcite, gypsum and quartz veins suggest that Uranium mineralization was resulted by hydrothermal magmatic processes. (author)

  6. The hydrogeochemical characteristics of the certain uranium deposit and their relationship with uranium mineralization

    International Nuclear Information System (INIS)

    Li Huanguang

    2010-01-01

    On the basis of previous work, this paper studies characteristics of the stratum,lithology,structure, ore bodies, ore and wall rocks and the relations between hydrochemical characteristics and uranium mineraliztion are stressed and anaysed.The environmental index of hydrogeochemisty is closely related with the uranium form, migration,and precipitation. According to negative ion, the ground water is classified into HCO3-,SO42-, HCO3--SO42-and HCO3-Cl-. For deposit genesis, uranium source comes from two parts; there are five mineralizations such as leaching, adsorption, hydrogeochemistry, palaeo-climatology and geothermal mineralization. Hydrogeochemical mineralization is the key process.. (authors)

  7. Clay minerals in sandstone uranium deposits: radwaste applications

    International Nuclear Information System (INIS)

    Brookins, D.G.

    1990-01-01

    Clay minerals play an important role in the genesis of uranium deposits in sandstones. They incorporate the rate earths (REE), U, Sb, Th, Cs, Rb, Sr, Y, Ba, and even small amounts of chalcophiles. These minerals possess analog elements for many of the radwaste fission products as well as actinides and some actinide daughters. In sandstone uranium deposits, clay minerals are also associated with sulfide minerals, usually pyrite, and organic carbonaceous matter. The primary clay minerals are usually smectites, illites, chlorites and mixed layer varieties. The integrity of these clay minerals is demonstrated by their retention of formational-mineralization ages determined by Rb-Sr geochronologic investigation of the Grants Mineral Belt of the United States. The importance of the clay minerals as analog for parts of the multi-barrier concept in radwaste disposal is their ability to impede water penetration into - and movement of key elements out of uranium rich zones. The clay minerals further sorb and in other ways incorporate into their structures many fission products and actinide analogs from man-made nuclear wastes. 22 refs., 1 fig., 3 tabs

  8. Diseases of uranium miners and other underground miners exposed to radon

    International Nuclear Information System (INIS)

    Samet, J.M.

    1991-01-01

    Excess lung cancer has been demonstrated in many groups of underground miners exposed to radon, including uranium miners and those mining other substances in radon-contaminated mines. In the United States, most underground uranium mines had shut down by the late 1980s, but occupational exposure to radon progeny remains a concern for many other types of underground miners and other underground workers. Worldwide, uranium mining continues, with documented production in Canada, South Africa and other African countries, and Australia. Thus, radon in underground mines remains a significant occupational hazard as the end of the twentieth century approaches.39 references

  9. Synthesis on Biology and Uranium Mineralization of Rabau Hulu Sector Kalan, Kalimantan Barat

    International Nuclear Information System (INIS)

    Bambang-Soetopo; Retno-Witjahyanti; Yanu-Wusana

    2004-01-01

    The results of previous research on Rabau Hulu sector consist of geology, geophysics and drilling data show that the area prospect for finding U mineralization. Goal of this synthesis is to know geological and U mineralization of Rabau sector in order to develop further followup program. In general geology the area consists of biotite micro quartzite, muscovite micro quartzite, muscovite quartzite, leopard quartzite, horn fels and granite. The directions of stratification is NE-SW of the dipping is NW. Prominent fault is NE-SW sinistral fault, NNE-SSW and NW-SE dextral fault. Uranium mineralization as a uraninite fill in the space between minerals and fractures system ENE-WSW, its associated with pyrite, pyrrhotite, chalcopyrite, molybdenite, sphalerite, magnetite, tourmaline and quartz. With radiometric anomalies values are about 1.000-15.000 c/s. Uranium mineralization process is connected with the granite intrusion as the hydrothermal magnetic process. (author)

  10. Analysis on geochemical conditions of uranium mineralization in Bashibulake uranium deposit, Xinjiang

    International Nuclear Information System (INIS)

    Liu Zhangyue; Dong Wenming; Cai Genqing; Liu Hongxu; Deng Huabo

    2011-01-01

    By studying the palaeoclimate and metallogenesis related geochemical indexes, this paper proposes that the hosting rocks should form in geochemical oxidation setting under arid palaeoclimate. The study on element assemblage associated with uranium mineralization indicates that the target hosting rocks suffered from different degrees of reworking of reducing fluid at first and then being superimposed by supergene oxidative fluid at tectonic uplifting stage. The uranium mineralization is located in reworked and superimposed places of two types of fluid. (authors)

  11. Formation mechanism of uranium minerals at sandstone-type uranium deposits

    International Nuclear Information System (INIS)

    Li Shengfu; Zhang Yun

    2004-01-01

    By analyzing the behavior and existence form of uranium in different geochemical environments, existence form of uranium and uranium minerals species, this paper expounds the formation mechanism of main commercial uranium mineral--pitchblende: (1) uranium is a valence-changeable element. It is reactivated and migrates in oxidized environment, and is reduced and precipitated in reducing environment; (2) [UO 2 (CO 3 ) 3 ] 4- , [UO 2 (CO 3 ) 2 ] 2- coming from oxidized environment react with reductants such as organic matter, sulfide and low-valence iron at the redox front to form simple uranium oxide--pitchblende; (3)the adsorption of uranium by organic matter and clay minerals accelerates the reduction and the concentration of uranium. Therefore, it is considered, that the reduction of SO 4 2- by organic matter to form H 2 S, and the reduction of UO 2 2+ by H 2 S are the main reasons for the formation of pitchblende. This reaction is extensively and universally available in neutral and weakly alkaline carbonate solution. The existense of reductants such as H 2 S is the basic factor leading to the decrease of Eh in environments and the oversaturation of UO 2 2+ at the redox front in groundwater, thus accelerating the adsorption and the precipitation of uranium

  12. Study on Kalimantan uranium province: The assessment on uranium mineralization of metamorphic and granitic rocks at Schwaner mountains

    International Nuclear Information System (INIS)

    Tjokrokardono, Soeprapto

    2002-01-01

    Uranium exploration activities done by CEA-BATAN had discovered uranium occurrences as the radiometric and uranium content anomalies at metamorphic and granite rocks of Schwaner Mountains, Kalimantan. A part of the occurrences on metamorphic rocks at Kalan basin has been evaluated and be developed onto follow-up step of prospecting by construction of some drilling holes and an exploration adit. In order to increase the national uranium resources, it is necessarily to extent the exploration activity to out side or nearby of Kalan basin. The goal of this assessment is to understand the uranium accumulation mechanism at Pinoh metamorphic rocks of Kalan Kalimantan and to delineate areas that uranium may exist. The assessment was based on the aspect of geology, anomaly of radioactivity and uranium contents, tectonics and alterations. Pinoh metamorphic rocks which is influenced by Sukadana granite intrusion are the high potential rocks for the uranium accumulation, because the intrusion contains a relatively high of U, Th, Cu, Zn, Nb, Mn, and W. The potential rock distributions are in between G. Ransa granite intrusion at the east and Kotabaru granite intrusions at the west. The mineralizations are categorized as vein type deposits of granitic association

  13. Uranium mineralization in tertiary volcanic rocks of the Los Frailes formation (Bolivia)

    International Nuclear Information System (INIS)

    Aparicio, A.

    1981-01-01

    The Los Frailes Formation, a 9000 km 2 area of Miocene-Pliocene age, contains uranium mineralization in acid tuffs, ignimbrites and lavas. Uranium also occurs in sedimentary rocks of various types and ages which outcrop in adjacent areas. So far the most extensive mineralization seems to be confined in volcanic pyroclastic rocks. Although the surface mineralization varies in grade from 0.01% to more than 2.5%, the average grade in the only deposit being mined (Cotaje) is 0.05% of U 3 O 8 . On the basis of the available data it is believed that certain leaching processes, during the last erosion cycle (Pliocene-Pleistocene) and under very humid conditions, brought about the mobilization of the uranium from the volcanic rocks in aqueous alkaline and calco-alkaline solutions circulating on the surface and underground. Uranium minerals were deposited, generally by chemical reduction, in tectonic zones and/or zones of high porosity. The common metallogenetic model in the western area, defined as the 'Sevaruyo uraniferous district', is exogenic and is characterized by epigenetic uranium occurrences and deposits formed by supergene enrichment. On the basis of their mechanism of formation, control of mineralization and mineral associations, these deposits are classified according to: those with strictly tectonic control, those with sedimentary control and those of mixed genetics. Recent discoveries in the eastern area of the volcanic complex give evidence of epigenetic mineralization, apparently linked with hypogene hydrothermal processes, in addition to exogenic mineralizations contained in rocks stratigraphically subjacent to the Los Frailes Formation. There is no intention of making an evaluation of the recently discovered resources since the studies and exploration are still at too early a stage to warrant prediction of their real potential. (author)

  14. The basic principle and criteria for ore prospecting of uranium neutralizing-reduction mineralization

    International Nuclear Information System (INIS)

    Shi Weijun; Zhou Wenbin; Yuan Xiaoqin

    1992-01-01

    The author discuss the geological criteria, alternated mineral and geochemical criteria of field recognition which is beneficial to the uranium neutralizing-reduction mineralization sectors on the basis of brief introduction to the principle of uranium neutralizing-reduction mineralization, and the geological significance of uranium neutralizing-reduction mineralization is also stated

  15. On the possibility of occurrence of uranium mineralization in some sedimentary formations of the Sudety Mts

    International Nuclear Information System (INIS)

    Miecznik, J.B.; Strzelecki, R.

    1979-01-01

    The Sudety Mts represent a part of the Bohemian Massif which is one of the richest uranium-bearing regions in Europe. The possibilities of occurrence of uranium in most interesting sedimentary formations of the Sudety Mts are analysed. The sedimentary formations which originated during the platform stage of evolution of these Mountains, after formation of Variscan endogenic mineralization, were recognized as perspective here. Sandstone-type uranium deposits and uraniferous black shales were assumed to be the most important in that area. Sandstone-type uranium deposits are related to continental uppermost Carboniferous (Glinik Beds - Westphalian C-D and, possibly, lowermost Stephanian) of the Central Sudety (Intra-Sudetic Depression). They closely resemble uranium deposits known from continental clastic Permo-Carboniferous sections of several parts of Europe. Westphalian D and Stephanian rocks developed in similar lithofacies in the western Sudety Mts (North-Sudetic Depression) may be also characterized by increased content of uranium. Attention is also paid to the possibilities of occurrence of uranium mineralization in shallow-marine sandstones and continental deposits of the Cenomanian as uranium deposits are known from similarly developed Cenomanian in the North Czech Upper Cretaceous Table area, i.e. in the direct neighbourhood of the Sudety Mts. Traces of uranium mineralization were found in black shales of the Lower Silurian section in the Kaczawa Mts (western Sudety Mts) and Bardo Mts (Central Sudety). The recorded concentrations (up to several hundred ppm) may be compared with uranium occurrences known from Lower Silurian sections of the Barrandian (CSSR) and Thuringia (GDR). (author)

  16. Gebel Gattar prospect, an obvious model of intra granitic uranium mineralization

    Energy Technology Data Exchange (ETDEWEB)

    Salman, A A; Shalaby, H M; Noseir, L; Elkhouli, D; Roz, M; Abu Zeid, M; Mostafa, M; Amin, N; Ayoub, R; Khamis, H [Nuclear materials authority, El Maadi, Cairo, (Egypt)

    1995-10-01

    Gebel Gattar area is situated in the northern Eastern desert, SW Hurghada city and is considered as an area of high potentiality for workable uranium deposits. The field radiometric prospect has started in May 1984. The geologic, structural and radiometric studies have resulted in the northern parts of the pluton and are controlled by some important structural features, namely NNE-SSW, ENE-WSW, NW-SE and to a lesser extent the N-S faults. The uranium content of the fresh granites in the area ranges from 20 to 30 ppm and thus could be considered as uraniferous granites. The mineralized samples are ranging from 1000 to 5000 ppm, while hand piked sample could reach as much as 14000 ppm. Detailed mineralogical studies proved the presence of various types of secondary uranium minerals presented mainly by molybdates, vanadates, silicate and sulphates. Exploratory tunneling works during 1990 to 1992 demonstrated that the uranium mineralization is still persistent from level 900 m (asl) to level 660 m (asl) which is nearly the wadi level. The alteration of the rocks especially hematitization, kaolination and partial silicificant is still well noticed and the gaping of the fault zone is more open and shows an increasing width. Moreover, secondary uranium minerals are still present indicating persistence of the oxidizing conditions. 5 figs., 4 tabs.

  17. Reconnaissance geochemical survey for uranium and related industrial minerals in Cebu Island

    International Nuclear Information System (INIS)

    Reyes, R.Y.; Ramos, A.F.; Magsambol, W.N.; Hernandez, E.

    1989-03-01

    Consistent with the program of evaluating the nuclear mineral resource potential and related industrial minerals of the Philippines, a reconnaissance geochemical survey was conducted in Cebu with considerable success. The total area covered by the survey was about 5,088 sq. kms. The survey consisted of systematic collection of 857 geochemical stream and water and heavy mineral samples, and measurement of radioactivity in over 352 stations. The average sampling density was about one set of samples per 15 to 30 sq. kms. All solid samples were analyzed for U, Cu, Pb, Zn, Mn, Ag, Co and Ni. Uranium, radon and conductivity were measured on most water samples collected. A total of 4,518 elemental determinations were involved. All field and analytical data were treated by statistics, and the computed parameters data were correlated with the geology of the area to establish anomalous zones. Four areas were delineated for possible uranium mineralization. Of the areas, the Mandaue river area is the most interesting for uranium. The contact zone between the diorite and the sedimentary rocks in this area appears to be a favorable geological environment for uranium mineralization. The other anomalous uranium values were found to be related with the guano and phosphate deposits. Uranium was also shown to be independent of the other seven elements in the geologic environment of Cebu. No definite elemental association could be established at present. This study also marks the thorough utilization of Q'GAS, Cadplot and Autocad, all microcomputer-based programs/systems, in the evaluation and interpretation of exploration-oriented geochemical and geological data, and with more significance in the sense that computer generated quality geochemical maps were produced, a first in the country. (Author). Appendices (23); 23 figs; 13 refs.; 4 tabs

  18. Characterization of uranium minerals from Chihuahua using synchrotron radiation

    International Nuclear Information System (INIS)

    Burciaga V, D. C.; Reyes C, M.; Reyes R, A.; Renteria V, M.; Esparza P, H.; Fuentes C, L.; Fuentes M, L; Silva S, M.; Herrera P, E.; Munoz, A.; Montero C, M. E.

    2010-01-01

    Uranium mineral deposits in the vicinity of Chihuahua City (northern Mexico) have motivated a multidisciplinary investigation due to their tech no-environmental importance. It provides a broad scope study of representative mineral samples extracted from the San Marcos deposit, located northwest of Chihuahua City. The zone of interest is the source of the Sacramento River, which runs at Chihuahua City. The high uranium content of the San Marcos deposit, which was formed by hydrothermal mineralization, has resulted in elevated levels of uranium in surface and ground water, fish, plants and sediments in this region. Mineral identification of the uranium-bearing phases was accomplished with a suite of techniques. Among these phases are those called meta tyuyamunite (Ca(UO 2 ) 2 (VO 4 ) 2 ·3-5 H 2 O) and becquerelite [Ca(UO 2 ) 6 O 4 (OH) 6 ·8(H 2 O)]. It was decided to study an almost pure meta tyuyamunite sample extracted from Pena Blanca, Chihuahua uranium ore and to synthesize the becquerelite, using a modified procedure from a published one. In the current work the crystal structure of meta tyuyamunite is presented, resolved by the Rietveld refinement. Both samples were studied by X-ray absorption fine structure at beamline 2-3, Stanford Synchrotron Radiation Light source. In the present work both the spectra and extended X-ray absorption fine structure parameters are presented. (Author)

  19. Characterization of uranium minerals from Chihuahua using synchrotron radiation

    Energy Technology Data Exchange (ETDEWEB)

    Burciaga V, D. C.; Reyes C, M.; Reyes R, A.; Renteria V, M.; Esparza P, H.; Fuentes C, L.; Fuentes M, L; Silva S, M.; Herrera P, E.; Munoz, A.; Montero C, M. E. [Centro de Investigacion en Materiales Avanzados, S. C., Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua (Mexico)

    2010-02-15

    Uranium mineral deposits in the vicinity of Chihuahua City (northern Mexico) have motivated a multidisciplinary investigation due to their tech no-environmental importance. It provides a broad scope study of representative mineral samples extracted from the San Marcos deposit, located northwest of Chihuahua City. The zone of interest is the source of the Sacramento River, which runs at Chihuahua City. The high uranium content of the San Marcos deposit, which was formed by hydrothermal mineralization, has resulted in elevated levels of uranium in surface and ground water, fish, plants and sediments in this region. Mineral identification of the uranium-bearing phases was accomplished with a suite of techniques. Among these phases are those called meta tyuyamunite (Ca(UO{sub 2}){sub 2}(VO{sub 4}){sub 2{center_dot}}3-5 H{sub 2}O) and becquerelite [Ca(UO{sub 2}){sub 6}O{sub 4}(OH){sub 6{center_dot}}8(H{sub 2}O)]. It was decided to study an almost pure meta tyuyamunite sample extracted from Pena Blanca, Chihuahua uranium ore and to synthesize the becquerelite, using a modified procedure from a published one. In the current work the crystal structure of meta tyuyamunite is presented, resolved by the Rietveld refinement. Both samples were studied by X-ray absorption fine structure at beamline 2-3, Stanford Synchrotron Radiation Light source. In the present work both the spectra and extended X-ray absorption fine structure parameters are presented. (Author)

  20. Hydrometallurgic treatment of a mineral containing uranium, vanadium and phosphorus

    International Nuclear Information System (INIS)

    Echenique, Patricia; Fruchtenicht, Fernando; Gil, Daniel; Vigo, Daniel; Bouza, Angel; Vert, Gabriela; Becquart, Elena

    1987-01-01

    A preliminary study of a mineral has been made towards the hydrometallurgy separation of uranium, vanadium and phosphorus. After the ore dressing, work on sulfuric acid with oxidation leaching has been made, to get the uranium, vanadium and phosphorus in solution. For the separation and purification of these elements, two alternative solvent extraction methods have been tested. One of them has been the extraction of uranium and vanadium and a selective stripping of both elements. The second one has been the selective extraction of uranium and vanadium at different aqueous solutions pH. In both methods, the same reagent has been used: di(2-ethylhexyl) phosphoric acid, kerosene as diluent with two different synergistic agents: TOPO (tri-n-octyl phosphine oxide) and TBP (tri-n-butyl phosphate). Batch studies have been made to determine the equilibrium isotherms for uranium and vanadium. A continuous countercurrent simulation method has been used to get the best phase ratio and to test different stripping agents. For the first method, an important loss of uranium and vanadium at the feed solution conditioning for the extraction step has been observed. For the second method, a good recovery of uranium has been reached, but there has been losses of vanadium in pH adjustment. Nevertheless, among these processes, the last seems to work better in this mineral hydrometallurgy. (Author) [es

  1. Study of uranium mineralization in rock samples from marwat range bannu basin by fission track analysis technique

    International Nuclear Information System (INIS)

    Qureshi, A.Z.; Ullah, K.; Ullah, N.; Akram, M.

    2004-07-01

    The Geophysics Division, Atomic Energy Minerals Centre (AEMC), Lahore has planned a uranium exploration program in Marwat Range, Bannu Basin. In this connection 30 thin sections of rock samples, collected from four areas; namely, Darra Tang, Simukili, Karkanwal and Sheikhillah from Marwat Range, and one from Salt Range were provided to Nuclear Geology Group of Physics Research Division, PINSTECH for the study of nature and mechanism of uranium mineralization These studies are aimed to help in designing uranium exploration strategy by providing the loci of uranium sources in the Marwat and Salt Ranges. The samples have been studied using fission track analysis technique. (author)

  2. Uranium occurence in the Rio Cristalino area, South of Para

    International Nuclear Information System (INIS)

    Andrade, S.M. de; Ribeiro, E.; Camarco, P.E.N.; Puppin, C.; Santos Filho, J.L. dos.

    1986-01-01

    The Rio Cristalino area where occurs uranium mineralization is located in the Western part of the Santana do Araguaia Town, Para State. This area comprises 1.350 Km 2 , and was selected from the evolution of the 'Projeto Geofisico Brasil - Canada - PGBC'. According to the results obtained from this Project, 15 airbone anomalies were selected for ground check. In the anomalies AN-03 and H-09 were found the best uranium occurence. The host rocks consist of arkose and sandstone of Pre-Cambriam ages, which show a very low-grade of metamorphism. The primary mineralization occurs in arkose along the cataclastic foliation (N70 0 W / 65 0 NE). The secundary mineralization involves clay galls and fills fracture zones in sandstone of the anomaly H-09. The highest grade detected in a rock sample of the anomaly AN-03 was 6,1% U 3 O 8 , whereas in the trenches there are intervals of 6 m thickness with a grade of 0,59% U 3 O 8 . Based on some mineralization aspects and field data, the genetic conceptual model to the uranium mineralization is proposed. (author) [pt

  3. Acid lixiviation of phophorite minerals for uranium extraction

    International Nuclear Information System (INIS)

    Linzama, H.; Rivas, J.

    1988-01-01

    Lixiviation studies of the phosphorite mineral, found in the north of Chile, using sulfuric acid solutions are described. These minerals contain 62.0 ppm of Uranium, 24% of Silice, 18.9% of P 2 O 5 and other metal-oxides. The influence of the acid concentration, the amount of acid used, granulometry, and the lixiviation yield as a function of the H 3 PO 4 and uranium concentrations was evaluated. In addition, the thermodinamic parameters of the lixiviation process were also evaluated. (author) [pt

  4. Birth effects in areas of uranium mining

    International Nuclear Information System (INIS)

    Wiese, W.H.

    1981-01-01

    A study of the reproductive history of families of 26 former uranium miners and 30 controls in San Juan County, New Mexico is presented. Studies of the secondary sex ratios, cytogenetic study of human sperm, and studies of rates of congenital anomalies are reported

  5. Treatability Test Plan for 300 Area Uranium Stabilization through Polyphosphate Injection

    Energy Technology Data Exchange (ETDEWEB)

    Vermeul, Vincent R.; Williams, Mark D.; Fritz, Brad G.; Mackley, Rob D.; Mendoza, Donaldo P.; Newcomer, Darrell R.; Rockhold, Mark L.; Williams, Bruce A.; Wellman, Dawn M.

    2007-06-01

    The U.S. Department of Energy has initiated a study into possible options for stabilizing uranium at the 300 Area using polyphosphate injection. As part of this effort, PNNL will perform bench- and field-scale treatability testing designed to evaluate the efficacy of using polyphosphate injections to reduced uranium concentrations in the groundwater to meet drinking water standards (30 ug/L) in situ. This technology works by forming phosphate minerals (autunite and apatite) in the aquifer that directly sequester the existing aqueous uranium in autunite minerals and precipitates apatite minerals for sorption and long term treatment of uranium migrating into the treatment zone, thus reducing current and future aqueous uranium concentrations. Polyphosphate injection was selected for testing based on technology screening as part of the 300-FF-5 Phase III Feasibility Study for treatment of uranium in the 300-Area.

  6. Treatability Test Plan for 300 Area Uranium Stabilization through Polyphosphate Injection

    International Nuclear Information System (INIS)

    Vermeul, Vince R.; Williams, M. D.; Fritz, Brad G.; Mackley, Rob D.; Mendoza, Donaldo P.; Newcomer, Darrell R.; Rockhold, Mark L.; Williams, Bruce A.; Wellman, Dawn M.

    2007-01-01

    The U.S. Department of Energy has initiated a study into possible options for stabilizing uranium at the 300 Area using polyphosphate injection. As part of this effort, PNNL will perform bench- and field-scale treatability testing designed to evaluate the efficacy of using polyphosphate injections to reduced uranium concentrations in the groundwater to meet drinking water standards (30 (micro)g/L) in situ. This technology works by forming phosphate minerals (autunite and apatite) in the aquifer that directly sequester the existing aqueous uranium in autunite minerals and precipitates apatite minerals for sorption and long term treatment of uranium migrating into the treatment zone, thus reducing current and future aqueous uranium concentrations. Polyphosphate injection was selected for testing based on technology screening as part of the 300-FF-5 Phase III Feasibility Study for treatment of uranium in the 300-Area

  7. Summary of investigations of uranium deposits in the Pumpkin Buttes area, Johnson and Campbell Counties, Wyoming

    Science.gov (United States)

    Troyer, Max L.; McKay, Edward J.; Soister, Paul E.; Wallace, Stewart R.

    1954-01-01

    Uranium minerals were discovered in the Pumpkin Buttes area, Campbell and Johnson Counties, Wyo., by the U. S. Geological Survey in October 1951. From June to November 1952, an area of about 750 square miles was examined for uranium deposits, and 211 localities having abnormally high radioactivity were found; uranium minerals are visible at 121 of these localities. All known uranium mineralization in the area is restricted to sandstones of the Wasatch formation, except sparsely disseminated uranium in the sandstone of the White River formation, which caps the Pumpkin Buttes, mid several localities on the Great Pine Ridge southwest of the Pumpkin Buttes where iron-saturated sandstone and clinker in the Fort Union formation have above-normal radioactivity. The uranium occurrences in the Wasatch formation are in a red sandstone zone 450 to 900 feet above the base of the formation and are of two types: small concretionary masses of uranium, iron, manganese and vanadium minerals in sandstone, and irregular zones in which uranium minerals are disseminated in sandstone. The second type is usually larger but of lower grade than the first. Most of the localities at which uranium occurs are in a north-trending belt about 60 miles long and 18 miles in maximum width.

  8. Review of the uranium miner experience in the United States

    International Nuclear Information System (INIS)

    Hilberg, A.W.

    1973-01-01

    Mining of uranium ores on a very small scale began in the United States in 1898. In 1948 mining of uranium ores increased significantly as a result of the increasing demands of the atomic energy program, particularly, the weapons program. It was well-known that radioactivity was associated with uranium ore and potential health hazards had been identified as early as 1921. It was then suggested that the large number of lung cancers found in the Schneeberg miners could possibly be caused by ionizing radiation. Radiation exposure to the lungs of uranium ore miners comes about because of varying concentrations of radon decay products in the mine atmosphere. Measurements of the amount of radioactivity in mine atmospheres began in the United States in 1950 and between 1951 and through 1968, approximately 43,000 measurements were made in about 2,500 uranium mines. Periodic medical surveys were made starting in 1950, but it was not until 1954, that a concerted effort was made to examine all miners. At this time an epidemiological study was begun by the U.S. Public Health Service to determine the effects of uranium mining with particular emphasis on the problem of lung cancer induction. The study of the miners, the results of which have been published, revealed a distinct and somewhat dramatic increase in lung cancer. This increase has been ascribed to the radiation exposure to radon-daughters. Because of the presence of a number of other potential occupational carcinogens in the dust of underground mines, there has been some question as to whether radon and radon-daughters constitute the principal cause of increased lung cancer risk among these miners

  9. Uranium mineralization of the Witwatersrand and Dominion Reef systems

    International Nuclear Information System (INIS)

    Simpson, P.R.; Bowles, J.F.W.

    1977-01-01

    Uranium-bearing minerals in the Witwatersrand and Dominion Reef sediments have been studied by ore microscopic, electron microprobe, fission track and neutron activation analytical methods to determine the controls of uranium mineralization. In the Dominion Reef, which represents a high-energy banket type of depositional environment, allogenic thorian uraninite occurs in hydraulic equivalence with allogenic pyrite, quartz and possibly also gold in the sediments which have uranium-thorium ratios between 3.1 and 5.6 indicating substantial amounts of thorium-rich resistate minerals. The Witwatersrand sediments have uranium-thorium ratios ranging between 7.1 and 19.6 indicating lesser amounts of resistates which is consistent with the lower-energy depositional environment. The proximal or nearshore deposits are of banket type but are distinguished from the Dominion Reef by the abundance of concretionary pyrite formed within the Basin and the presence of carbonaceous matter. The distal deposits formed at greater distance from the shoreline contain decaying organic material which has precipitated both uranium and gold from solution. Subsequent metamorphism has resulted in the formation of carbonaceous material bearing finely disseminated low-thorium pitchblende and a fine dissemination of gold associated with sulphides and arsenides. (author)

  10. Geology and evaluation of the uranium mineral occurrence at Igdlorssuit, South Greenland

    International Nuclear Information System (INIS)

    Armour-Brown, A.

    1986-05-01

    Geological and radiometric mapping, and petrological and mineralogical investigations were made of a uranium mineral occurrence at Igdlorssuit, South Greenland during 1984 and 1985. The results have been evaluated in terms of the uranium potential and genesis the showing. The work was part of the South Greenland Exploration Programme (Sydex) carried out by the Geological Survey of Greenland (GGU) in cooperation with Risoe National Laboratory (Risoe). It was financed by the Danish Ministry of Energy. Igdlorssuit is located at the northerly limit of the fjord system about 60 km north of Kap Farvel (60 deg. 23 min.; 46 deg. 06 min.). The main uranium mineral showing is on a small alp on the eastern side, 500 m vertically above the fjord. Detailed plane table mapping (1:1000), and radiometric measurements with a lead collimated scintillometer calibrated for uranium delineated this occurrence: Regional mapping (1:10 000), however, showed that it was only one of many similar uranium occurrences in the area albeit the largest and richest. Over 35 uranium mineral occurences have been found scattered over the hillside. Textural and paragenetic relationships, and isotopic data show that the uranium was present in the supracrustal units before the folding, metamorphism and intrusion of the granite. The largest, highest grade uranium mineralised zone is about 50m long and up to 5m wide with an average grade of 0.31% with highs up to 7%. The results of the mapping and sampling has established that this type of mineral occurence can reach economic grades, and its surface expression suggests a size which could approach economic proportions. 3 maps, 30 refs. (EG)

  11. Removal of radioactivity and mineral values from uranium mill tailings

    International Nuclear Information System (INIS)

    Williams, J.M.; Cokal, E.J.; Dreesen, D.R.

    1981-01-01

    One possible approach to remedial action on uranium mill tailings involves the removal of the components that are responsible for the environmental concern (notably radon releases) posed by these materials. Removing mineral values at the same time can defray much of the cost. This paper presents laboratory results on sulfuric acid leachings and their effectiveness in accomplishing these aims. 9 figures, 4 tables

  12. Metallogenetic condition and mineralization characteristics of uranium deposit No.114

    International Nuclear Information System (INIS)

    Niu Lin; Ma Fei; Yang Wanjin

    1988-01-01

    Deposit No 114 is one of the typical carbonate-type uranium deposits, that are widely distributed in South China. In this paper formational environment of host rock, wall-rock alteration, sulfur, oxygen, carbon isotopes, mineralization temperatures, ore compsitions were studied. Based on the U-Pb isotopic research three mineralization stages in deposit No 114 were established, namely 104 Ma, 61 Ma and 11 Ma. It is suggested, that the deposit No 114 is a polygenetic deposit formed primarily by supergene leaching and hydrothermal reworked. The uranium deposit has multi-sources, the main uranium source of which is from the granite body situated nearby. According to metallogenetic characteristics the authors suggest the favourable geological exploration guides for this kind of ore deposits

  13. Applied mineral exploration with special reference to uranium

    International Nuclear Information System (INIS)

    Bailey, R.V.; Childers, M.O.

    1977-01-01

    An explanation of the fundamentals of organizing, operating, and concluding an exploration program, particularly uranium exploration, is presented. Discussion of many exploration practices currently being used in the industry and a review of some new developments or research projects which are being studied or which show promise are included. The material is presented in 13 chapters entitled: the Mineral Explorationist and the Role He Plays; Types of Uranium Deposits; Development of Idea and Preliminary Investigation: Uranium; a Review of Mining Law as it Pertains to Mineral Exploration and Development in the United States; Land Ownership and Leasing; Continuing Detailed Geologic Work; the Decision to Make a Play; Selling a Deal; Legal and Accounting Aspects; the Drilling Program; Using Geology in Planning and Executing Drilling; Transition from Exploration to Development; and a Forward Look

  14. Mortality analysis in the French cohort of uranium miners

    International Nuclear Information System (INIS)

    Vacquier, B.

    2008-10-01

    The objective of this thesis is to contribute to the estimation of radiation-induced risks at low dose rates. This work is based on the cohort of uranium miners French presenting multiple exposures, contamination by internal (radon and uranium dust) and external exposure (gamma radiation). An analysis of the risk of death and the relationship risk exposure was carried out within the cohort of uranium miners after extension of the monitoring until 1999, for cancers diseases and non-cancers. In addition, an analysis taking into account multiple exposures to ionizing radiation was carried out within the framework of this thesis. This analysis has improved knowledge on the risk of mortality associated with low levels of exposure to radon. (author)

  15. Uranium minerals in Upper Carboniferous rocks in the Nowa Ruda region

    International Nuclear Information System (INIS)

    Bareja, E.

    1981-01-01

    Results of mineralogical studies on uranium in Upper Carboniferous rocks (Glinik Beds - Westphalian C - D and Ludwikowice Beds - Stephanian) in the vicinities of Nowa Ruda (Central Sudetic Depression) are presented. Uranium mineralization is here related to sandstones and polymictic conglomerates with clay and clay-carbonate cement. The major uranium-bearing horizon was found in middle part of the Glinik Beds, and some increase in uranium content - at the base of that unit. In the case of Stephanian rocks, points with uranium mineralization were found in various parts of the Ludwikowice Beds sequence: in basal conglomerate horizon and platy sandstones. Uranium minerals mainly occur in cement of sandstones and conglomerates. They were mainly identified as uranium blende and minerals of the sulfate group - zippeite and uranopilite. Mineralized uranium-bearing horizons display mineral paragenesis typical of Upper Carboniferous rocks of the Central Sudetic Depression: uranium blende, pyrite, chalcopyrite, sphalerite and galena. (author)

  16. Fractal character of structural control on uranium mineralization in south china

    International Nuclear Information System (INIS)

    Zhou Quanyu; Tan Kaixuan; Xie Yanshi

    2009-01-01

    South China is the most important uranium producer in the country. Most uranium ore deposits in south China are strictly controlled by NE-NNE trending regional fracture structure. Fractal analyses on spatial distribution of uranium ore deposits and regional fracture structure in south China have been done in this paper. It indicates that the spatial distribution of both uranium ore deposits and regional fracture structure in south China show fractal character. The fractal dimension D=1.414 2 for the spatial distribution of regional fracture structure in the whole area indicate a higher ripening degree in the fracture structure evolution and an advantages to fluid flow and uranium mineralization. The fractal dimension D=1.052 7 for the spatial distribution of uranium ore deposits in south China show a lower complexity than regional fracture structure. The fractal dimensions in three sub-areas in south China on spatial distribution of uranium ore deposits show a positive correlation to which of regional fracture structure. The fractal spatial distribution of uranium ore deposits in south China is the result of the evolution of the fractal fracture structure system. (authors)

  17. Relationship between the feature of gravity and magnetic fields and uranium mineralization in the south piedmont of Tianshan mountain

    International Nuclear Information System (INIS)

    Cui Huanmin; Luo Juecheng.

    1988-01-01

    The figures of Bouguer anomalies and vertical magnetic anomalies obtained at the scales of 1:1000 000, 1:500 000 and 1:100 000 were processed and the Moho depths were calculated. The feature of gravity and magnetic fields over uranium deposits was determined through interpreting cmprehensive data from uranium deposits No. 504 and No. 509 and potential areas of uranium mineralization were predicted

  18. Recovery of uranium mineral concentrate from copper tailings

    International Nuclear Information System (INIS)

    Chakravarty, S.; Tewari, U.K.; Beri, K.K.

    1991-01-01

    Based on the studies conducted on the samples of copper tailings from Surda Copper Concentrator plant, wet concentrating table (Diaster Diagonal Deck) was found most suitable for recovering uranium mineral concentrate. Based on this technique, uranium recovery plants were set up at Surda, Rakha and Mosabani. The recoveries obtained from Surda Uranium Recovery Plant and Rakha Uranium Recovery Plant were in the range of 40-50%. But in Mosaboni Uranium Recovery Plant which is treating copper tailings from Mosaboni Copper Concentrator Plant, the biggest concentrator plant processing nearly 2,700 MT/day of copper ore, the recovery by wet concentrating tables was found to be around 22%. Low recovery was mainly due to low concentration of uranium in ore and as well as more percentage of uranium distribution in fines which tables were unable to recover. Studies were done to recover uranium mineral concentrate from the fines with new set of equipment viz. Curved Static Screen/Bartles Mozley Separator/Cross Belt Concentrator. This gave an improvement of 14-16% only. Studies by low acid leaching in chemical process side have shown that an overall recovery of 68% can be achieved. Though the chemical process is best as far as recovery is concerned but there are several constraints. The major constraint is pertaining to environmental and pollution control. Depending on the results of studies to overcome the constraints decision for the process to be adopted will be taken up and executed. The test results and plant performance data have also been included in the paper. (author). 8 figs., 11 tabs., 1 appendix

  19. Concentrations of uranium and thorium isotopes in uranium millers' and miners' tissues

    International Nuclear Information System (INIS)

    Wrenn, M.E.; Singh, N.P.; Paschoa, A.S.; Lloyd, R.D.; Saccomanno, G.

    1985-09-01

    The alpha-emitting isotopes of uranium and thorium were determined in the lungs of 14 former uranium miners and in soft tissues and bones of three miners and two millers. These radionuclides were also determined in soft tissues and bones of seven normal controls. The average concentrations in pCi/kg wet weight in 17 former miners' lungs are as follows: 238 U, 75; 234 U, 80; 230 Th, 79. Concentrations of each nuclide ranged from 2 to 325 pCi/kg. The average ratio of 238 U/ 234 U was 0.92, ranging from 0.64 to 1.06. The mean ratio of 230 Th/ 234 U was 1.04, ranging from 0.33 to 3.54. The near equilibrium between 230 Th and /sup 238,234/U indicates that the rate of elimination of uranium and thorium from lungs is the same in former uranium miners. The concentrations of 234 U and 238 U were highest in lung; however, the concentration of 230 Th in bones was either higher than or comparable to its concentration in lung. The concentration ratios of 230 Th/ 234 U in bone of uranium miners and millers measured in our laboratory have been compared with results predicted by ICRP-30 metabolic models. These results indicate that the ICRP metabolic models for thorium and uranium were only marginally successful in predicting the ratio of 230 Th/ 234 U in bones, and that effective release rate of uranium from skeleton may be more rapid than predicted by the ICRP model. 9 figs., 21 tabs

  20. Characteristics and geneses of rossing type uranium mineralization in Chenjiazhuang granite, Danfeng, Shanxi

    International Nuclear Information System (INIS)

    Xu Zhan; Du Letian.

    1988-01-01

    According to the study of field geology and Rb-Sr isotopic system (initial 87 Sr/ 86 Sr = 0.7130, isochron age = 378Ma), oxygen isotope (δ 18 O = 12.772/1000), rare earth elements (ΣREE = 370ppm, δEu = 0.14-0.67) and the structure state of K-feldspar (t 1 = 0.93-0.98, t 10 = 0.90-0.97) of Chenjiazhuang granite, it is recognized that Chenjiazhuang granite is a continental crust-transformation type granite, mainly derived from terrigenous clastic sediment rather than intermediate-basic volcanic rocks in Qinling group. Uranium mineralization occurs as disseminated within the granite. Uraninite is the only ore mineral. U-Pb isotopic system of uraninite gives a mineralization age of 407 Ma ±, this is similar to the whole-rock isochron age of Rb-Sr. These, combined with the observation of thin sections and the study of other aspects, come to the conclusion that this uranium mineralization is a syngenetic one, that is ,Rossing type U-mineralization The study of genesis and mineralization of Chenjiazhuang granite is of significance not only to the exploration of uranium in this area, but also to the regional geology of Qinling area

  1. The appilcation of variogram to the evaluation of vocanic uranium mineralization in Gan-Hang structural belt

    International Nuclear Information System (INIS)

    Li Hanbo; Pan Wei; Mao Yuxian

    2010-01-01

    Based on a brief introduction of principle, algorithm of variogram and the geological condition of study area, variogram was introduced into the correlation study of volcanic type uranium mineralization and terrain. The process of calculating variogram of terrain elevation where uranium deposits (orefield) with different scales occur in Gan-Hang Tectonic Belt was described in detail. The geological significance of variogram statistics was preliminarily analyzed. The results show that the long axis direction of variogram of terrain elevation could reflect the main structure direction of study area, while the radius of long axis and short axis of variogram are consistent with uranium mineralization scales in a certain extent. (authors)

  2. Multisource data set integration and characterization of uranium mineralization for the Montrose Quadrangle, Colorado

    International Nuclear Information System (INIS)

    Bolivar, S.L.; Balog, S.H.; Campbell, K.; Fugelso, L.E.; Weaver, T.A.; Wecksung, G.W.

    1981-04-01

    Several data-classification schemes were developed by the Los Alamos National Laboratory to detect potential uranium mineralization in the Montrose 1 0 x 2 0 quadrangle, Colorado. A first step was to develop and refine the techniques necessary to digitize, integrate, and register various large geological, geochemical, and geophysical data sets, including Landsat 2 imagery, for the Montrose quadrangle, Colorado, using a grid resolution of 1 km. All data sets for the Montrose quadrangle were registered to the Universal Transverse Mercator projection. The data sets include hydrogeochemical and stream sediment analyses for 23 elements, uranium-to-thorium ratios, airborne geophysical survey data, the locations of 90 uranium occurrences, a geologic map and Landsat 2 (bands 4 through 7) imagery. Geochemical samples were collected from 3965 locations in the 19 200 km 2 quadrangle; aerial data were collected on flight lines flown with 3 to 5 km spacings. These data sets were smoothed by universal kriging and interpolated to a 179 x 119 rectangular grid. A mylar transparency of the geologic map was prepared and digitized. Locations for the known uranium occurrences were also digitized. The Landsat 2 imagery was digitally manipulated and rubber-sheet transformed to quadrangle boundaries and bands 4 through 7 were resampled to both a 1-km and 100-m resolution. All possible combinations of three, for all data sets, were examined for general geologic correlations by utilizing a color microfilm output. Subsets of data were further examined for selected test areas. Two classification schemes for uranium mineralization, based on selected test areas in both the Cochetopa and Marshall Pass uranium districts, are presented. Areas favorable for uranium mineralization, based on these schemes, were identified and are discussed

  3. Uranium mineralization in the central region of Cuba

    International Nuclear Information System (INIS)

    Valdez, M.G.; Olivera, J.; Fernandez, P.

    1995-01-01

    The present work shows different geological and geophysical index for uranium mineralization found at Loma Alta iron ore deposit, located in the central region of Cuba. In this deposit was carried out pull work of iron ore. The tunnels were radiometrically documented in the wall and the floor observing some anomalies of the gamma ray intensity (up to 1700 c.p.s.) associated with the poor iron ore. In those points were collected solid sample. The obtained results were very important (uranium concentrations values up to 3500 ppm)

  4. The assessment of radioactive dose of uranium miners

    International Nuclear Information System (INIS)

    Zhou Zhumou

    1988-01-01

    The main factors of radioactive hazard in uranium mines are radioactive ore dust, radon gas and its daughters. These hazards often result in contracted sillicosis and lung cancer among miners. However, they can be fully avoided if some active radiation protection measures are adopted. According to the statistics over the past 30 years, the average annual sillicosis rate in uranium mines in China was only 0.083%, far less than that of coal mines and metal mines. On the other hand, the average lung cancer rate was 108.3/million.men.annum, which is also very low

  5. Fluorimetrich determination of uranium in mineral samples and phosphoric solutions

    International Nuclear Information System (INIS)

    Pupo Gonzales, I.; Cuevillas, J.; Estevez, J.

    1991-01-01

    In this paper an analytical technique for the determination of uranium in different cuban minerals and acid leaching liquors of phosphorites is proposed. The method used for solid samples includes their disolution and further dilution of the solution obtained. For liquid samples dilution is the only intermediate step used. A study of HNO3 concentration (pH) was made in fluorimetric measurements. The method was applied to the uranium analysis in two IAEA standard reference samples (phosphate base), in natural phosphorites and a synthetic one, in clays and phosphoric liquors. The results agree with those obtained by other methods

  6. Characterization of pyroxenes associated with the uranium mineralization of the Jazida Cachoeira (Lagoa Real Uranium Province, Bahia State, Brazil

    International Nuclear Information System (INIS)

    Goncalves, Rhaine Matos

    2005-01-01

    This work has as objective to contribute for the knowledge about the genesis of the Cachoeira uranium deposit (Lagoa Real Uranium Province, Bahia State, Brazil), characterizing pyroxenes (with emphasis in those associated with the uranium mineralization and those hosting inclusions) of the deposit and their associated inclusions. In function of the accomplished analyses, steps that should be followed to obtain and interpret data from fluid inclusions (FI), in the D09B XRF X-Ray Fluorescence Beam Line of the National Synchrotron Light Laboratory, Campinas, Brazil, have been described. The analyzed pyroxenes are augites, diopsides and aegirine-augites, and intermediate terms, for example between augite and diopside, were detected. They presented two and three phases fluid inclusions being some, possible, primary ones. The three phases FI could present a birefringent solid phase. The pyroxenes presented, also, solid inclusions. The analysis of some solid inclusions revealed that they were albites. These albites are, probably, previous to the pyroxene host mineral. The obtained results indicated that the studied pyroxenes are associated to an important phase of caleic metasomatism. These pyroxenes are not totally associated to the precipitation of the uranium. In the petrographic study of the samples, two types of plagioclase were identified, one very altered and other less altered. Synchrotron light is a powerful tool for analyze FI. It was verified that care in the preparation of the sample, such as the selection of near-surface FI, are very important to obtain reliable data. In the studies with synchrotron light only the vanadium was detected in larger amount in the area that contained FI (in pyroxene), in relation to the control area, due, mainly, to experimental factors. The presence of this element it is not easy to interpret. Additional studies, on solid and fluid inclusion in pyroxene, and in other minerals, will be important to understand the Cachoeira uranium

  7. Analyses on the Bayintala basin tectonic movement control of the uranium mineralization

    International Nuclear Information System (INIS)

    Guo Funeng; Yao Rongyan; Cai Jianfang; Zhou Wenbo

    2014-01-01

    Ban Tara tectonic evolution, analysis of the relationship between depression of ore-bearing layer deposition system and epigenetic alteration and uranium mineralization, forms of uranium precipitation and enrichment in each movement stage, thus mineralization regularity in the area and oreprospecting direction. Depression experienced extensional Early Cretaceous warped fault, pull-apart sedimentary, four main stages of evolution inversion uplifting since the late Cretaceous sedimentary and. Deposition of the Tenggeer group and the Saihan group two prospecting target layer, the fan delta Tenggeer formation is sand body and Saihan group of braided river facies sand body, as the main prospecting target layer. According to the analysis of faulted depression-depression sedimentary stage of the formation of the grey clastic rocks are the important ore-bearing horizon, and inversion uplifting the strata with relatively open environment, to provide the necessary conditions for the later formation of uranium deposits. (authors)

  8. Detection of trisomy 7 in bronchial cells from uranium miners

    Energy Technology Data Exchange (ETDEWEB)

    Lechner, J.F.; Neft, R.E.; Belinsky, S.A. [and others

    1995-12-01

    New Mexico was the largest producer of uranium in the western world during 1960s and 1970s. Investigators at the University of New Mexico School of Medicine`s Epidemiology and Cancer Control Program have been conducting epidemiological studies on uranium miners over the past 2 decades. Currently, this cohort includes more than 3600 men who had completed at least 1 y of underground work experience in New Mexico by December 31, 1976. These miners, who are now in their 5th through 7th decades, the age when lung cancer incidence is highest, are at high risk for developing this disease because they were exposed to high levels of radon progeny in the mines, and they also smoked tobacco. However, not all people comparably exposed develop lung cancer; in fact, the lifetime risk of lung cancer for the smoking uranium miners has been projected by epidemiological analyses to be no higher than 50%. Therefore, the identification of gene alterations in bronchial epithelium would be a valuable tool to ascertain which miners are at greatest risk for lung cancer. The underlying significance of the current effort confirms the hypothesis that chronic exposure to high concentrations of {alpha}-particles and tobacco smoke produces genetically altered lung epithelial cells throughout the respiratory tract of some susceptible individuals before they develop clinical disease.

  9. Detection of trisomy 7 in bronchial cells from uranium miners

    International Nuclear Information System (INIS)

    Lechner, J.F.; Neft, R.E.; Belinsky, S.A.

    1995-01-01

    New Mexico was the largest producer of uranium in the western world during 1960s and 1970s. Investigators at the University of New Mexico School of Medicine's Epidemiology and Cancer Control Program have been conducting epidemiological studies on uranium miners over the past 2 decades. Currently, this cohort includes more than 3600 men who had completed at least 1 y of underground work experience in New Mexico by December 31, 1976. These miners, who are now in their 5th through 7th decades, the age when lung cancer incidence is highest, are at high risk for developing this disease because they were exposed to high levels of radon progeny in the mines, and they also smoked tobacco. However, not all people comparably exposed develop lung cancer; in fact, the lifetime risk of lung cancer for the smoking uranium miners has been projected by epidemiological analyses to be no higher than 50%. Therefore, the identification of gene alterations in bronchial epithelium would be a valuable tool to ascertain which miners are at greatest risk for lung cancer. The underlying significance of the current effort confirms the hypothesis that chronic exposure to high concentrations of α-particles and tobacco smoke produces genetically altered lung epithelial cells throughout the respiratory tract of some susceptible individuals before they develop clinical disease

  10. Discussion on the basement topography and its relation with the uranium mineralization in Xiangshan basin

    International Nuclear Information System (INIS)

    Long Qihua; Liu Qingcheng

    2002-01-01

    The depth of the basement and the relation between the basement relief shape and uranium mineralization are discussed by forward and inverse computation for large-scale gravity data in Xiangshan basin. The difference of basement topography result in the inhomogeneous distribution of uranium mineralization. The margin of the basement upheaval section and the variation place of basement topography are the favorable place for uranium mineralization. It's helpful to prospect deep and blind uranium deposit in Xiangshan basin

  11. Environmental prospects of uranium from mineral phosphates

    International Nuclear Information System (INIS)

    Schnug, Ewald; Haneklaus, Nils

    2012-01-01

    Uranium (U) is a natural resource that is found in rock phosphates (P). Each year farmers apply unwittingly 167 t/yr U to their soils by P fertilisation. If extracted and used for electricity generation with state of the art nuclear power plants this amount of U could cover the energy demand of 2.4 x 10 6 average German households. Otherwise this finite resource is wasted. U from P fertilisers is an uncommon contribution of agriculture to climate protection. Using the key to calculate the CO 2 depending German car tax band, 1 kilogram P would be valued with 1.8 Euro. More than that the extraction of U from rock phosphates is an efficient measure to avoid U entering the food chain. In particular translocation processes in soils of fertiliser-applied U by run-off and leaching which result in the contamination of surface waters and finally drinking water can be impeded efficiently. (orig.)

  12. Prospect analysis for sandstone-type uranium mineralization in the northern margin of Qaidam basin

    International Nuclear Information System (INIS)

    Liu Lin; Song Xiansheng; Feng Wei; Song Zhe; Li Wei

    2010-01-01

    Affected by the regional geological structural evolution, a set of sedimentary structure, i.e. the construction of coal-bearing classic rocks which is in favor of the sandstone-type uranium mineralization has deposited in the northern margin of Qaidam Basin since Meso-Cenozoic. A NWW thrust nappe tectonic belt, i.e. the ancient tectonic belt which is the basis for the development of ancient interlayer oxidation zone formed by the tectonic reverse in late Jurassic and Cretaceous. The Mid and late Jurassic layer was buried by the weak extension in Paleogene and the depression in early Neogene. The extrusion reversal from late Neogene to Quaternary made the basin into the development era of the modern interlayer oxidation zone. It can be concluded that the layer of the northern margin of Qaidam Basin has the premise for the formation of sandstone-type uranium ore. Based on the analysis of the characteristics of the thrust belt, the structure of the purpose layer, the sand body, the hydrogeology, the interlayer oxidation zone and uranium mineralization, the results indicated that the ancient interlayer oxidation zone is the prospecting type of sandstone-type uranium ore. Beidatan and the east of Yuqia are the favorable prospective area of sandstone-type uranium mineralization. (authors)

  13. Mineral resources of the Hawk Mountain Wilderness Study Area, Honey County, Oregon

    International Nuclear Information System (INIS)

    Turrin, B.D.; Conrad, J.E.; Plouff, D.; King, H.D.; Swischer, C.C.; Mayerle, R.T.; Rains, R.L.

    1989-01-01

    The Hawk Mountain Wildeness Study Area in south-central Oregon is underlain by Miocene age basalt, welded tuff, and interbedded sedimentary rock. The western part of this study area has a low mineral resource potential for gold. There is a low mineral resource potential for small deposits of uranium in the sedimentary rocks. This entire study area has a low potential for geothermal and oil and gas resources. There are no mineral claims or identified resources in this study area

  14. 226Ra and natural uranium in egyptian bottled mineral waters

    International Nuclear Information System (INIS)

    Higgy, R.H.

    2000-01-01

    Concentration levels of 226 Ra and natural uranium have been analysed bottled mineral water commercially available in egypt. 226 Ra was determined by applying a chemical procedure in which Ra was coprecipitated with Ba as sulphate. The precipitate was then dissolved with EDTA and then measured by liquid scintillation system, after mixing with a scintillation cocktail. Natural uranium was determined by applying a chemical procedure for uranium extraction using MIBK and then measured using laser fluorimeter system. The concentration values obtained were compared with concentrations reported by other countries and with reference values accepted for drinking water. Based on the consumption rate and the measured concentrations, the collective committed effective doses were calculated. In addition, Ca, Mg and Na were measured using Icp system and compared with some worldwide values

  15. Geology of the uranium occurrence in the Bungua area, Siavonga District, Zambia

    International Nuclear Information System (INIS)

    Prasad, R.S.; Money, N.J.; Thieme, J.G.

    1979-01-01

    Uranium mineralization related to the fluviatile continental sandstone of the Escarpment Grit Formation of Upper Karroo System has been studied in detail in the Bungua area. Airborne and ground gamma-radiation surveys resulted in the discovery of mineralized bodies containing secondary minerals such as meta-autunite, phosphuranylite, uranocircite, abernythite, boltwoodite, etc. disseminated in various ways. Geological, radiometric, stratigraphic, sedimentological and petrological studies coupled with exploration pitting, trenching and drilling were employed to assess the nature, distribution and sub-surface continuation of mineralized bodies. Drilling, logging and XRF analysis revealed that the uranium mineralized bodies are mainly lenses at different levels, which may be concordant or discordant with bedding. The thickness and grade of ore horizons differ considerably. Mineral distribution and controls are complex and that the main deposit is controlled by reducing lithologies, organic matter, clay traps, micas, iron cementing and permeable channels. Although no definite mode of origin can be attributed to the presently seen uranium mineralized bodies, they appear to be from a pre-existing ore deposit which is mobilized and redistributed during oxidation by supergene processes. It is suggested that the original uranium was in solution as uranylion and came from the same source area as the host rocks and the uranium-bearing groundwater and streams moved in the same direction as the associated Escarpment Grit sediments. Uranium was precipitated wherever favourable conditions prevailed in the Escarpment Grit Formation. (author)

  16. Retrospective chromosome aberration analysis of former uranium miners

    International Nuclear Information System (INIS)

    Meszaros, G.; Bognar, G.; Koeteles, G. J.

    2003-01-01

    In this paper we present our data collected in the period of 1981-1985 on 165 persons exposed by different radon concentrations expressed in working level month (WLM) units from 100 up to 600. Following the decommissioning of the uranium mine in Hungary in 1997 cytogenetic status of 131 persons were within a follow-up-study of their health conditions initiated by the Hungarian Academy of Science. The persons have terminated their underground activities 5 to 20 years before testing. The comparison of the two datasets suggest a long-term persistence of cytogenetic alterations above the population average values in large percentages of persons investigated. The frequency of chromosome aberrations of uranium miners was found increased in function of their exposure to radon. The comparison of the miner's categories 20 years ago and in the recent years demonstrated the long-term existence of aberrations for many years after completion of underground mining activities. (authors)

  17. Beaufort group uranium mineralization - a model that may aid exploration

    International Nuclear Information System (INIS)

    Stuart-Williams, V.

    1982-01-01

    The ore bodies examined while working on the Pristerognathus Diictodon Assemblage Zone West of Beaufort West are of the URAVAN type (URA - uranium, VAN - vanadium). It was found that uranium mineralization in any one ore body was not strictly random and tends to be associated with a fairly consistent sandstone and siltstone geometry. Mineralization is only found where coalescence between the two sandstones has occurred and it disappears where the sandstones remain coalesced. At a point of coalescence the fluids from the upper and lower sandstone are mixed, the oxidizing fluid penetrating progressively deeper in the sandstone couplet until the entire couplet is oxidizing. This generates a weakly dipping REDOX front. The REDOX front is not considered strong enough to have precipitated uranyl carbonate complexes in transport

  18. Environmental prospects of uranium from mineral phosphates

    Energy Technology Data Exchange (ETDEWEB)

    Schnug, Ewald [Technische Univ. Braunschweig (Germany). Faculty 2 - Life Sciences; Haneklaus, Nils [Stuttgart Univ. (Germany). Inst. fuer Kernenergetik und Energiesysteme

    2012-12-15

    Uranium (U) is a natural resource that is found in rock phosphates (P). Each year farmers apply unwittingly 167 t/yr U to their soils by P fertilisation. If extracted and used for electricity generation with state of the art nuclear power plants this amount of U could cover the energy demand of 2.4 x 10{sup 6} average German households. Otherwise this finite resource is wasted. U from P fertilisers is an uncommon contribution of agriculture to climate protection. Using the key to calculate the CO{sub 2} depending German car tax band, 1 kilogram P would be valued with 1.8 Euro. More than that the extraction of U from rock phosphates is an efficient measure to avoid U entering the food chain. In particular translocation processes in soils of fertiliser-applied U by run-off and leaching which result in the contamination of surface waters and finally drinking water can be impeded efficiently. (orig.)

  19. Geology and Uranium Mineralization of Tanah Merah and Dendang Arai Sectors, West Kalimantan

    International Nuclear Information System (INIS)

    Bambang-Soetopo

    2004-01-01

    Tanah Merah and Dendang Arai sectors are one of the mineralized sectors at Kalan. Goal of this study is to understand the relationship between geology and uranium mineralization character of Tanah Merah and Dendang Arai sectors. In general geology of Tanah Merah is similar with Dendang Arai which consist of biotite quartzite, leopard quartzite, muscovite quartzite, biotite muscovite quartzite, metasilt, metapelite, and granite. The folding is anticline with axel N45F in direction. The prominent fault is NE-SW sinistral fault, NW-SE dextral fault and N-S normal faults. U mineralization fills in the area space between minerals and also as the vein that fill in the fracture system W-E to WNW-ESE in direction. The thickness of mineralization is milimetric to centrimetric. Uranium minerals are uraninite, monazite, autunite and gummite associated with feldspar, tourmaline, zircon, biotite, quartz, pyrite, pyrhotite, hematite, rutile, chalcopyrite, magnenite ilmenite and molybdenite. Radiometric value is in the range of 1.000 to 15.000 c/s and the total grade of U are 12.6 to 2661.25 ppm. U mineralization process connected with intrusion of granite and in the secondary phase. (author)

  20. Radioactive mineral occurrences in the Bancroft area

    Energy Technology Data Exchange (ETDEWEB)

    Satterly, J

    1958-12-31

    The report summarizes three years of field work conducted in the Bancroft area investigating occurrences of radioactive minerals, and also includes accounts of properties in the area for which drill logs and survey reports have been filed. It begins with a history of exploration and development of radioactive mineral deposits in the area, a review of the area`s general geology (Grenville metasediments, plutonic rocks), and general descriptions of the types of radioactive mineral deposits found in the area (deposits in granitic and syenitic bodies, metasomatic deposits in limy rocks, hydrothermal deposits). It also describes the mineralogy of radioactive minerals found in the area and the Geiger counter technique used in the investigation. The bulk of the report consists of descriptions of radioactive mineral properties and mine workings, containing (where available) information on exploration history, general and economic geology, and production.

  1. Mineral transformations during the dissolution of uranium ore minerals by dissimilatory metal-reducing bacteria

    Science.gov (United States)

    Glasauer, S.; Weidler, P.; Fakra, S.; Tyliszczak, T.; Shuh, D.

    2011-12-01

    Carnotite minerals [X2(UO2)2(VO4)2]; X = K, Ca, Ba, Mn, Na, Cu or Pb] form the major ore of uranium in the Colorado Plateau. These deposits are highly oxidized and contain U(VI) and V(IV). The biotransformation of U(VI) bound in carnotite by bacteria during dissimilatory metal reduction presents a complex puzzle in mineral chemistry. Both U(VI) and V(V) can be respired by metal reducing bacteria, and the mineral structure can change depending on the associated counterion. We incubated anaerobic cultures of S. putrefaciens CN32 with natural carnotite minerals from southeastern Utah in a nutrient-limited defined medium. Strain CN32 is a gram negative bacterium and a terrestrial isolate from New Mexico. The mineral and metal transformations were compared to a system that contained similar concentrations of soluble U(VI) and V(V). Electron (SEM, TEM) microscopies and x-ray spectromicroscopy (STXM) were used in conjunction with XRD to track mineral changes, and bacterial survival was monitored throughout the incubations. Slow rates of metal reduction over 10 months for the treatment with carnotite minerals revealed distinct biotic and abiotic processes, providing insight on mineral transformation and bacteria-metal interactions. The bacteria existed as small flocs or individual cells attached to the mineral phase, but did not adsorb soluble U or V, and accumulated very little of the biominerals. Reduction of mineral V(V) necessarily led to a dismantling of the carnotite structure. Bioreduction of V(V) by CN32 contributed small but profound changes to the mineral system, resulting in new minerals. Abiotic cation exchange within the carnotite group minerals induced the rearrangement of the mineral structures, leading to further mineral transformation. In contrast, bacteria survival was poor for treatments with soluble U(VI) and V(V), although both metals were reduced completely and formed solid UO2 and VO2; we also detected V(III). For these treatments, the bacteria

  2. Geophysical anomalies associated with uranium mineralization from Beldih mine, South Purulia Shear Zone, India

    International Nuclear Information System (INIS)

    Mandal, Animesh; Biswas, Arkoprovo; Mittal, Saurabh; Mohanty, William K.; Sharma, Shashi Prakash; Sengupta, Debashish; Sen, Joydip; Bhatt, A.K.

    2013-01-01

    Beldih mine at the central part of the South Purulia Shear Zone (SPSZ) has been reported with low grade uranium-bearing formation within quartz-magnetite-apatite host in kaolinized formation. Therefore, the present integrated geophysical study with gravity, magnetic, radiometric, very low frequency electromagnetic (VLF) and gradient resistivity profiling methods around the known mineralized zones aimed at identifying the exact geophysical signatures and lateral extent of these uranium mineralization bands. The closely spaced gravity-magnetic contours over the low to high anomaly transition zones of Bouguer, reduced-to-pole magnetic, and trend surface separated residual gravity-magnetic anomaly maps indicate the possibility of high altered zone(s) along NW-SE direction at the central part of the study area. High current density plots of VLF method and the low resistive zones in gradient resistivity study depict the coincidence with low gravity, moderately high magnetic and low resistivity anomalies at the same locations. Moderate high radioactive zones have also been observed over these locations. This also suggests the existence of radioactive mineralization over this region. Along profile P2, drilled borehole data revealed the presence of uranium mineralization at a depth of ∼100 m. The vertical projection of this mineralization band also identified as low gravity, low resistivity and high magnetic anomaly zone. Thus, the application of integrated geophysical techniques supported by geological information successfully recognized the nature of geophysical signatures associated with the uranium mineralization of this region. This enhances the scope of further integrated geophysical investigations in the unexplored regions of SPSZ. (author)

  3. The effect of sedimentation background of depression target stratum containing mineral in Erlian basin, Ulanqab to uranium mineralization type

    International Nuclear Information System (INIS)

    Kang Shihu; Jiao Yangquan; Men Hong; Kuang Wenzhan

    2012-01-01

    The ore bearing stratum in depression of Ulanqab contains target stratum of lower cretaceous Saihan formation, upper cretaceous Erlian formation, paleogene system etc. The uranium mineralization type which have found by now contains sandstone type, mudstone type and coal petrography. The genetic type of mineral deposit contains paleovalley-type, reformed type after superposition with sedimentation and diagenesis by sedimentation. Uranium mineralization of both the natural type and genetic type have close relationship with its ore bearing stratum. Different geological background forms different sedimentary system combination, and different sedimentary system combination forms different uranium mineralization type. (authors)

  4. Uranium

    International Nuclear Information System (INIS)

    Cuney, M.; Pagel, M.; Leroy, J.

    1992-01-01

    First, this book presents the physico-chemical properties of Uranium and the consequences which can be deduced from the study of numerous geological process. The authors describe natural distribution of Uranium at different scales and on different supports, and main Uranium minerals. A great place in the book is assigned to description and classification of uranium deposits. The book gives also notions on prospection and exploitation of uranium deposits. Historical aspects of Uranium economical development (Uranium resources, production, supply and demand, operating costs) are given in the last chapter. 7 refs., 17 figs

  5. The characteristics of soda metasomatite type uranium mineralization for proterozoic strata in the central-southern part of Kang-Dian earth's axis

    International Nuclear Information System (INIS)

    Qian Farong

    1995-12-01

    The uranium mineralization for Proterozoic strata in the central-southern part of Kang-Dian earth's axis can be divided into four typy (sandstone, soda metasomatite, proterozoic epimetamorphics and quartzite). The soda metasomatite type is the dominant type of uranium mineralization and has the prospecting potential in the area. The characteristics of this type uranium mineralization and the problems of metallogenesis are discussed. Soda metasomatite type uranium mineralization is controlled by soda metasomatite and structure. Uranium exists mainly in the forms of minerals (pitchblende, uranate). Its cell parameter is high and oxygenated coefficient is low, belonging to moderate-low temperature hydrothermal origin. The metallogenetic materials originated from deep-seated crust and country rocks. The metallogenetic solution includes a great quantity of atmospheric water, besides hydrothermal solution from deep-seated crust. The metallogene underwent the two stages i.e. Jinnin and Chengjiang. (4 tabs., 3 figs.)

  6. Phosphorus - uranium mineralization of the Mandacaru Farm, Iraucuba, state of Ceara, Brazil

    International Nuclear Information System (INIS)

    Leal, J.R.L.V.; Azevedo, L.F. de; Castro, G.L.; Alcantara e Silva, J.R. de

    1984-01-01

    The phosphorus-uranium mineralization of the Mandacaru Farm (Iraucuba - state of Ceara) is located in the phosphorus-uranium Province of north-central Ceara. The area is a mobile belt placed between the Sao Luiz and the Sao Francisco cratons, related to the Northeast Folding Region. It is represented by lithologies from the Fundamental Complex (Transamazonico Cycle) and the Ceara Group ectinict series (Brasiliano Cycle). All the rocks are cut by Eo-Cambrian acidic dikes and Jurassic basic dikes. The plastic tectonics acted over the regional rocks through four folding phases; the first two being of isoclinal recumbent type, and the last two subvertical open folds. The fissural tectonics affected the area in the form of overthrust faults and transcurrent faults. The fracturing system was reactivated as normal faults during the Brasiliano Cycle. The phosphorus-uranium mineralization appears in the form of uraniferous collophane/apatite forming disseminations i gnaisses, calc-silicated rocks and amphibolites; stockwork structures in marbles; and occurring as matrix in breccias and cataclasites. This mineralization occurs in fractured ad faulted areas, associated to diaphthoresis, sodic metasomatism and episyenitization processes. (Author) [pt

  7. Preliminary study of the uranium favorability of granitic and contact-metamorphic rocks of the Owens Valley area, Inyo and Mono Counties, California, and Esmeralda and Mineral Counties, Nevada

    International Nuclear Information System (INIS)

    Cupp, G.M.; Mitchell, T.P.

    1978-01-01

    Granitic and contact-metamorphic rocks of the Owens Valley area were sampled to determine their favorability for uranium. Uranium deposits associated with these rocks were examined to determine the mode of occurrence. Metamorphic rocks near contacts with intrusive rocks include skarns, schists, quartzites, metaconglomerates, hornfels, gneisses, and metavolcanics. The grade of contact metamorphism ranges from slight to intense, depending upon the distance from the intrusive contact. The average U 3 O 8 content of the metamorphic rock samples is 3 ppM. Metamorphic rock samples in a roof pendant at the Claw prospect contain as much as 3 percent U 3 O 8 . Skarn samples from the Birch Creek pluton contain as much as 114 ppM U 3 O 8 ; those from the Santa Rita Flat pluton contain as much as 23 ppM U 3 O 8 . Most of the intrusive rocks are granite, quartz monzonite, or monzonite. Granodiorite and diorite are less common, and gabbro is rare. The average U 3 O 8 content of the crystalline rock samples is 4 ppM. Samples from a quartz-monzonite pluton east of Lone Pine, California, and quartz monzonite in the Santa Rosa Hills had maximum contents of 28 and 13 ppM U 3 O 8 , respectively. Areas of contact metamorphism and metasomatism, such as those at the Claw prospect and Birch Creek pluton, are probably the most favorable sites for uranium deposits. There are many miles of granitic and contact-metamorphic zones in which undiscovered uranium deposits may exist. Although the overall uranium content of granitic rocks appears to be low, the pluton east of Lone Pine and the Hunter Mountain pluton in the area of the Santa Rosa Hills have sufficient uranium to have acted as uranium and detrital source rocks for uranium deposits that may now be buried in Tertiary sediments in the basins around the plutons. The Claw deposit is the only known uranium deposit of a size and grade to be of possible commercial interest

  8. Study on the remote sensing geological information of uranium mineralization in Western Liaoning and Northern Hebei

    International Nuclear Information System (INIS)

    Yu Baoshan; Wang Dianbai; Jin Shihua; Qiao Rui

    1996-01-01

    Based on the whole areal geological map joint application rd exploitation, composite forming map, generalization analysis and field examination in detail of key region that mainly depend on remote sensing information and generalize the data of geology, geophysical and geochemical prospecting, and geohydrology, this paper reveals the structure framework, regional geological background, uranium metallogenic condition and space time distribution rule of orustal evolution and its result, and set up the interpretation marks of arc-shaped structure in different of rock area and discusses its geological genesis. The author also interprets volcanic apparatus, small type closed sedimentary basin, magmatic rock body which relate closely to uranium deposit, ore control structure and occurrence and type of mineralization alteration envelope. The thermal halo point of satellite image is emphatically interpreted and its geological meaning and its relation to uranium deposit is discussed. Remote sensing geological prospecting ore model and synthetic provision model is determined lastly

  9. Micronuclei in lymphocytes from currently active uranium miners

    International Nuclear Information System (INIS)

    Zoelzer, Friedo; Freitinger Skalicka, Zuzana; Havrankova, Renata; Hon, Zdenek; Rosina, Jozef; Navratil, Leos; Skopek, Jiri

    2012-01-01

    Micronuclei can be used as markers of past radiation exposure, but only few studies have dealt with uranium miners. In this paper, we report on micronuclei in lymphocytes from individuals currently working at Rozna, Czech Republic, the last functioning uranium mine in the European Union. A modified micronucleus-centromere test was applied to assess the occurrence of micronuclei in stimulated lymphocytes, as well as their content in terms of whole chromosomes or fragments. Compared with unexposed individuals, the miners had higher frequencies of micronucleus-containing lymphocytes and higher percentages of micronuclei without centromeres, and the differences were significant for both parameters (0.74 ± 0.60 vs. 0.50 ± 0.42, p = 0.017 and 49 ± 44 vs. 12 ± 21, p = 0.0002; means ± standard deviations). There were also significant correlations between one or other of these parameters on the one hand and various dose values on the other, in particular with a 'retrievable' dose, that is, a dose whose effect should still be recognisable in lymphocytes assuming a half-life of 3 years. The 'retrievable' dose at which a doubling of the micronucleus frequency was observed was around 35 mSv, corresponding to a total dose of 90 mSv received while working in the mines. Altogether, our data show that the micronucleus-centromere test is a valuable tool for the assessment of past radiation exposure in uranium miners. The scatter in the data is of course far too great to allow individual dosimetry, but for groups of a few dozen exposed individuals, the method can be used to monitor doses clearly below 100 mSv. (orig.)

  10. Uranium miner lung cancer. A study about two cases

    International Nuclear Information System (INIS)

    Madelrieux, J.-M.

    1977-01-01

    The problem of lung cancer in uranium miners is analyzed on the basis of the two cases observed. Epidemiological studies establish conclusively the existence of increased hazards in the case of early working conditions, which gave rise to large accumulated doses of irradiation. Unfortunately these studies have their limits, the most important being inadequacy of sampling, and doubts remain about the low exposure levels prevailing nowadays and which concerns the cases investigated. The absence of certainty over long-term effects of low exposure levels is leading to the development of research to establish the exact nature of the dose-effect relationship and the possible existence of a radiotoxicity threshold on the basis of which the protective measures from the CMA angle could be revised. Biological research has proved the responsibility of α radiation from active radon deposits as a source of lung cancer in uranium miners, but other contributing factors must not be neglected: tobacco for instance, which plays an important part, but also the presence of engine exhaust gases and non-specific lung aggressions connected with dampness and ventilation. The occupational risk examined concerns only 600 miners now working at the bottom of uranium mines in France, and since extraction began a dozen cancers have been detected including 10 in heavy smokers. 2 cases correspond to exposures of 300 WLM, 3 to values between 150 and 100WLM and the rest to very slight exposures, 10 to 50 WLM. Although these figures are not conclusive the fact that exposure in French mines averages 0.3 WL means that the results of the French epidemiological study can be awaited with some optimism [fr

  11. Radioactive mineral deposits of the Pembroke-Renfrew area

    International Nuclear Information System (INIS)

    Masson, S.L.; Gordon, J.B.

    1981-01-01

    This report deals with the geological features of all the reported uranium and thorium occurrences in the Pembroke-Renfrew area of southeastern Ontario. There are 118 radioactive occurrences within the study area of which 102 were examined by the authors during the summers of 1977 and 1978. The report consists of a comprehensive description of the geological association and mineral content of the deposits which were examined. In addition, an attempt has been made to determine their mode of origin in order to assess the potential for discovery of additional deposits and to provide guidelines for exploration

  12. Environmental restoration. Stabilization of mining tailing and uranium mineral

    International Nuclear Information System (INIS)

    Perez, C.; Carboneras, P.

    1998-01-01

    ENRESA has dismantling a uranium mill facility and restored the site since 1991 to 1994. Since 1997, 19 uranium mines are being re mediated. The Andujar uranium mill was operational since 1959 to 1981. The remedial action plan performed in the Andujar mill site involved stabilizing and consolidating the uranium mill tailings and contaminated materials in place. Mill equipment, building and process facilities have been dismantled and demolished and the resulting metal wastes and debris have been placed in the pile. The tailings mass has been reshape by flattening the side slopes and cover system was placed over the pile. The uranium mines are located in Extremadura and Andalucia. There is a great diversity among the mines in terms of the magnitude of the disturbed areas by mining work and the effects on the environment, including excavations, waste rock piles, abandoned shafts and galleries, and remaining of surface structures and facilities. Remedial measures include the sealing for shafts and openings to prevent collapse of mine workings and subsidence, the dewatering and the open-pit excavation and the treatment of the contaminated waters, the disposal and the stabilization of mining debris piles to prevent dispersion, the placement of a re vegetated cover over the piles to control dust and erosion, and the restoration of the site. (Author)

  13. Hydrogeochemical methods for studying uranium mineralization in sedimentary rocks

    International Nuclear Information System (INIS)

    Lisitsin, A.K.

    1985-01-01

    The role of hydrogeochemical studies of uranium deposits is considered, which permits to obtain data on ore forming role of water solutions. The hydrogeochemistry of ore formation is determined as a result of physicochemical analysis of mineral paragenesis. Analysis results of the content of primary and secondary gaseous - liquid inclusions into the minerals are of great importance. Another way to determine the main features of ore formation hydrogeochemistry envisages simultaneous analysis of material from a number of deposits of one genetic type but in different periods of their geochemical life: being formed, formed and preserved, and being destructed. Comparison of mineralogo-geochemical zonation and hydrogeochemical one in water-bearing horizon is an efficient method, resulting in the objective interpretation of the facts. The comparison is compulsory when determining deposit genesis

  14. Uranium mineralization in the Mesoproterozoic Banganapalle formation near Nagayapalle, Cuddapah Basin, Andhra Pradesh

    International Nuclear Information System (INIS)

    Basu, Himadri; Harikrishnan, T.; Hanumanthappa, D.; Rengarajan, M.; Saravanan, B.; Bhagat, Sangeeta; Mahendra Kumar

    2008-01-01

    Cuddapah Basin is the hub of uranium exploration for years together in India. Initial efforts were for quartz-pebble-conglomerate type mineralization. However, the emphasis later shifted towards dolostone-hosted mineralization and finally to unconformity-associated uranium mineralization. The recent finding of uranium mineralization associated with the Banganapalle Formation near Nagayapalle is the outcome of continuous exploration input in the Cuddapah Basin over years. Uranium mineralization (up to 0.278% U 3 O 8 ) associated with the Mesoproterozoic Banganapalle Formation near Nagayapalle is represented by pitchblende and autunite. Pitchblende occurs as tiny grains in the intergranular spaces and along grain boundaries; and also at places replaces pyrite and covellite grains. The geological set-up indicates that the geodomain is favourable for uranium mineralization. (author)

  15. Alkaline autoclave leaching of refractory uranium-thorium minerals

    International Nuclear Information System (INIS)

    Milani, S. A.; Sam, S.

    2011-01-01

    This paper deals with the study of an innovative method for processing the Oman placer ores by alkaline leaching in ball mill autoclaves, where grinding and leaching of the refractory minerals take place simultaneously. This was followed by the selective separation of thorium and uranium from lanthanides by autoclave leaching of the hydroxide cake with ammonium carbonate-bicarbonate solutions. The introduced method is based on the fact that thorium and uranium form soluble carbonate complexes with ammonium carbonate, while lanthanides form sparingly soluble double carbonates. It was found that a complete alkaline leaching of Oman placer ores (98.0 P ercent ) was attained at 150 and 175 d egree C within 2.5 and 2h, respectively. Oman placer ores leaching was intensified and accelerated in a ball mill autoclaves as a result of the grinding action of steel balls, removal of the hydroxide layer covering ores grains and the continuous contact of fresh ore grains with alkaline solution. The study of selective carbonate processing of hydroxide cake with ammonium carbonate-bicarbonate solutions on autoclave under pressure revealed that the complete thorium recovery (97.5 P ercent ) with uranium recovery (90.8 P ercent ) and their separation from the lanthanides were attained at 70-80 d egree C during l-2h. The extraction of lanthanides in carbonate solution was low and did not exceed 4.6 P ercent .

  16. Metallogenic geologic conditions and prospecting direction of sandstone type uranium mineralizations in Yili basin of Xinjiang

    International Nuclear Information System (INIS)

    Chen Daisheng; Wang Ruiying; Li Shengxiang; Zhang Kefang

    1994-09-01

    Yili basin is a Mesozoic down-warped basin superimposed on the late Paleozoic volcanic taphrogenic basin. Uranium mineralizations are hosted in the Middle-Lower Jurassic coal-bearing series. The depositions environment in the basin is turbulent in the east and relatively stable in the west. It is characterized by coarse-grained sequence with thin thickness in the eastern part and fine-grained with thick thickness in the western part. On the analytical basis of sedimentary facies indices, it is the first time to present a sedimentary model of 'alluvial fan-braided stream-(narrow) lakeshore delta-lacustrine facies and marsh facies' for the coal-bearing series. The authors have summarized the basic geologic features of U-mineralizations in the interlayer oxidation zone, analyzed the difference and cause of U-mineralizations between the south and north, as well as the east and west. The genetic mechanism of U-mineralizations in the basin is discussed. Finally, seven items of geologic prerequisites for the formation of in-situ leachable sandstone type uranium deposits have been suggested and the potential of sandstone type U-mineralizations in the basin has been evaluated. Four promising target areas are selected

  17. Remote sensing application research of mineralization prospect of uranium-polymetal deposits in west side of Daxinganling

    International Nuclear Information System (INIS)

    Luo Fusheng; Cui Zhenkui; Fang Maolong; Wang Guojuan; Yao Hua

    1998-12-01

    The key of mineral exploration by remote sensing method is the extraction and identification of mineralization-related geologic information from remote sensing data under the guidance of mineralization theory. Remote sensing research of deposits is combined with the analysis of regional geology setting, so as to give full play to the advantage of remote sensing technology. According to the geologic features of the covered area, different kinds of satellite data are, at first, selected and processed with different methods and therefore mineralization-related geologic information is effectively extracted. Then regional geologic setting is discussed and main mineralization-controlled factors, such as uranium-occurred volcanic basins, mineralization-controlled faults and granite bodies, Mesozoic volcanic rock series, volcanic framework, are identified. On the basis of the former study, the remote sensing image models of different kinds of deposits have been established. Finally, multi-source information integration technique has been applied to the assessment of favorable mineralization areas. This research shows that it is feasible to extract and identify mineralization-related information from remote sensing images in complicated and covered areas, and that the study area is favorable for uranium and polymetal deposit explorations because of its favorable geologic setting and mineralization conditions

  18. Laboratory investigations of refractory uranium minerals from the Kvanefjeld uranium deposit, Greenland

    International Nuclear Information System (INIS)

    Rose-Hansen, J.; Soerensen, H.; Makovicky, M.; Konnerup-Madsen, J.; Holm, P.M.

    1982-01-01

    The project described in this report is a contribution to a large project on the beneficiation of the Kvanefjeld uranium deposit in the Ilimaussaq intrusion in South Greenland. The main object of our project has been to undertake laboratory experiments on steenstrupine in order to define the optimum extraction conditions. A pressurized carbonate leaching method was introduced. The Risoe experiments are carried out on bulk samples of the ore while we decided to study the minerals, first of all steenstrupine, and carbonate solutions as leaching media. Our experiments demonstrated that the leaching conditions arrived at by the Risoe group give the highest recovery and thus may be termed the optimum conditions using sodium carbonate leaching methods. Studies of the solid products left after the leaching experiments by means of the electron microprobe show that the grains of steenstrupine remain and that the leaching of uranium proceeds from the margins of the grains and towards their interior. We decided also to study the effect of applying ammonium sulphate solutions. These gave significantly higher recoveries. We consider the results of the experiments using ammonium sulphate solutions as an essential new information on the extractability of the Kvanefjeld ore and as a main result of our study. It is demonstrated that in the 13 types of rocks examined, including lujavrites, 25-75 % of the thorium and 2-58 % of the uranium contained in the rocks can be leached out and are thus not firmly bound in the minerals. (author)

  19. Recovery of uranium mineral from Liaoning Fengcheng ludwigite ore by gravity concentration

    International Nuclear Information System (INIS)

    Zhang Tao; Liang Haijun; Xue Xiangxin

    2009-01-01

    A laboratory research was carried out to recover uranium mineral from Liaoning Fengcheng ludwigite ore. Gravity concentration methods including hydroclone, spiral chute and shaking table were applied in this study. The results show that a concentrate with uranium grade of 0.216% and recovery of 44.24% could be produced from the feed of uranium content 0.006 3%. This research is helpful to comprehensive utilization of the mineral resources. Increasing further uranium mineral liberation degree is the key to improve separation effects. (authors)

  20. BfR recommends the establishment of a European maximum level for uranium in drinking and mineral water

    OpenAIRE

    German Federal Institute for Risk Assessment

    2007-01-01

    Uranium is a widespread, radioactive heavy metal on earth. It is to be found in varying concentrations and states in various rocks and minerals as well as in water, soil and air. Uranium may also reach the environment anthropogenically for instance in mineral phosphate fertilisers. Because of its widespread presence traces of uranium can also be detected in foods like drinking and mineral water. Uranium is not essential for humans. The ongoing intake of higher uranium concentration...

  1. Analysis on geology condition of uranium mineralization and the exploration orientation for Baixingtu district southwestern Songliao basin

    International Nuclear Information System (INIS)

    She Xinmin; Cui Jiahua; Gong Wenjie; Li Zeming; Li Changhua; Zhao Junlong

    2007-01-01

    The paper mainly analyses the uranium mineralization conditions at Baixingtu district of southwestern Songliao basin. The research is focused on the characteristic of braided stream faces grey sandbody of Yaojia formation and the feature of epigenetic deoxidation and oxidization features of uranium mineralization abnormity, relation of uranium mineralization abnormity to fault, relation of uranium mineralization abnormity to interval oxidation, genesis of uranium mineralization and their controlling factors. It is considered that there are favorable metallogenic conditions in the Baixingtu-Donghuagen district of the east edge of Baixingtu denuded structure window for the formation of Qianjiadian type uranium deposit. (authors)

  2. Local distribution of uranium in rocks and miner:als as an indicator of its geochemical history

    International Nuclear Information System (INIS)

    Omel'yanenko, B.I.; Kozlova, P.S.; Eliseeva, O.P.; Simonova, L.I.

    1983-01-01

    Uranium behaviour at all stages of magmatic and postmagnetic processes is s tudied. The data obtained ground the orn-generating ability of magmatic melts. The basic tendencies of geohemical uranium history in crystalline rocks are det ermined by the process of its redistribution with a transition from accessory mi nerals to secondary minerals-concentrates

  3. The geology of uranium mineralization at Mika, N.E. Nigeria

    International Nuclear Information System (INIS)

    Funtua, I.I.; Okujeni, C.P.; Elegba, S.B.

    1995-01-01

    The Uranium mineralization at Mike is located near Zing in Taraba State, N.E., Nigeria. The host rock consist of a sheared Pan-African medium-grained granite which is in places intruded by rhyolite and siliceous veins. Numerous joints, faults and fractures criss-cut the area. Some of the fractures are filled with secondary quartz. The ore occurs in two parallel N-S trending shear Zones with the western limb hosting a rhyolite body. Drill section reveals a subsurface extension of the mineralization. In the upper limb, mineralization consisting of metal autunite and coffinite occurs associated with the rhyolite body. In lower ore limb meta-autunite, coffinite and pitchblende occur along a set of two parallel shear surface. The pitchblende occurs massive and as vein lets in association with sulphides. The ore body is marked by distinct hydrothermal alteration zones which feature sericitization, silicification, hematization and kaolination. Reactivated regional structures of NE-SW and the N140oE and N170E played an important role in the formation of Mika mineralization. These acted as channel and as mechanical barrier for the mineralization fluid. The bimodal magmatism of the Burashika group is postulated to be related to the process of mineralization in view of the ubiquitous rhyolite in the mineralized bodies

  4. Uranium mineralization associated with late Palaeozoic acid magmatism in northeast Queensland

    International Nuclear Information System (INIS)

    Bain, J.H.C.

    1977-01-01

    The late Palaeozoic acid igneous petrographic province, covering some 120,000 km 2 in the Cairns-Townsville hinterland, has associated uranium mineralization characterized by various combinations of uranium, fluorine, and molybdenum. Mineralization of this type has been described from other parts of the world, but is best known in the USSR. Information about the Australian deposits and occurrences is very limited, but it is apparent that the mineralization is mainly of hydrothermal origin and genetically related to extensive late Palaeozoic magmatism. A detailed description of the mineralization and the prospect of additional discoveries of uranium deposits of similar and related types in other parts of Australia are discussed. (J.R.)

  5. Radioactive waste disposal and study of mineral deposit of uranium

    International Nuclear Information System (INIS)

    Doi, Kazumi

    2003-01-01

    To realize high level radioactive waste disposal, it is need to guarantee with high reliability safety of isolation of radioactive waste during some ten thousand years. There are two important factors related to geophysics such as ground water and diastrophism. The problems to be solved in the present point are followings; 1) increasing data of characteristics of radionuclide within high level radioactive waste, 2) development of undisruptive exploration technologies of lithosphere, especially formal fabric of pore and 3) improvement of protection technologies of diastrophism. Our country has to make efforts to realize the safety of isolation of radioactive waste on the basis of researches, by means of keeping them in the strong facilities without disposal. The formation of concentrated uranium in the mineral deposit was explained in relation with high level radioactive waste disposal. (S.Y.)

  6. Cause of death in former miners of uranium mines

    International Nuclear Information System (INIS)

    Vich, Z.; Koskova, D.

    1992-01-01

    The mortality in a cohort of 4,803 former miners from uranium mines was analyzed with special reference to other causes of death than bronchogenic cancer. The observed frequencies of death from other causes were significantly lower than the expected rates for the period of 1968-1985 as well as in various periods of observation, this especially in the group of cardiovascular diseases, other tumors and the group of other diseases; at the same time, frequencies of death from diseases of respiratory and digestive systems and from injuries were not different from the expected rates. This may be caused by the s.c. health worker effect or by increased mortality from lung tumors at a younger age than that which is usual in the non-exposed male population. (author) 4 tabs., 14 refs

  7. Analysis of geological condition of uranium mineralization in the Xiangshan northern uranium orefield in central region of Jiangxi Province

    International Nuclear Information System (INIS)

    Zhou Yulong; Liu Yunlang; Gao Yan

    2013-01-01

    According to the basic conditions of 'source, guide, transportation, storage' for uranium mineralization in strata and different types of geological structure, departure from the condition, the coupling effect of stratigraphy, lithology and structure are studied in the process of uranium mineralization in northern Xiangshan volcanic basin. Studies show that the northern ore field are of good metallogenic geological conditions and the uranium rich ancient land mass and uranium rich magma generated by the melting of deep metamorphic rocks. The main geologic events are volcanic eruptions, accompanied by repeated subvolcanic magma intrusion and strong faults and nappe tectonics which result in volcanic collapse and volcanic ring structures. These ore-forming geological condition control the structural frame for the formation of main uranium deposit type-subvolcanic rocks in northern Xiangshan ore field. (authors)

  8. Occupational exposure and mortality in the German uranium miner cohort

    International Nuclear Information System (INIS)

    Schnelzer, M.; Dufey, F.; Grosche, B.; Sogl, M.; Tschense, A.; Walsh, L.; Kreuzer, M.

    2014-01-01

    The German uranium miners cohort study comprises 58,982 men employed in the GDR by the Wismut company for at least six months between 1946 and 1989. Particularly in the early years, miners were exposed to high levels of radon, silica and other harmful substances. The aim of the cohort study is to investigate the health effects of occupational exposures. The cohort was established in 1998 with mortality follow-ups every five years, i.e. vital status and cause of death are ascertained. Annual exposures to radon progeny, external gamma-radiation, long-lived radionuclides, fine dust, silica and arsenic dust were individually assessed by means of a comprehensive job-exposure matrix. For data analyses Poisson regression models were used. By end of 2008, 25,438 (43 %) cohort members were deceased with known cause of death in 94 %. In total 7,780 cancer mortalities were observed, including 3,500 from lung cancer. Lung cancer mortality is twice as high as in the general population largely due to occupational radon progeny and silica exposure. Also 975 silicosis deaths were observed and there is some evidence for a relationship between radon progeny exposure and cancers of the extra-thoracic airways. Circulatory diseases and non-malignant diseases of the airways were also investigated, but no relationship to occupational exposure was found. Up to now health effects of uranium mining in the Wismut cohort primarily manifest themselves as increases in lung cancer and silicosis mortality due to high radon progeny and silica exposure. With increasing duration of follow-up, further findings regarding more rare causes of death and levels of exposure relevant today are expected.

  9. Uranium mineralization in fluorine-enriched volcanic rocks

    Energy Technology Data Exchange (ETDEWEB)

    Burt, D.M.; Sheridan, M.F.; Bikun, J.; Christiansen, E.; Correa, B.; Murphy, B.; Self, S.

    1980-09-01

    Several uranium and other lithophile element deposits are located within or adjacent to small middle to late Cenozoic, fluorine-rich rhyolitic dome complexes. Examples studied include Spor Mountain, Utah (Be-U-F), the Honeycomb Hills, Utah (Be-U), the Wah Wah Mountains, Utah (U-F), and the Black Range-Sierra Cuchillo, New Mexico (Sn-Be-W-F). The formation of these and similar deposits begins with the emplacement of a rhyolitic magma, enriched in lithophile metals and complexing fluorine, that rises to a shallow crustal level, where its roof zone may become further enriched in volatiles and the ore elements. During initial explosive volcanic activity, aprons of lithicrich tuffs are erupted around the vents. These early pyroclastic deposits commonly host the mineralization, due to their initial enrichment in the lithophile elements, their permeability, and the reactivity of their foreign lithic inclusions (particularly carbonate rocks). The pyroclastics are capped and preserved by thick topaz rhyolite domes and flows that can serve as a source of heat and of additional quantities of ore elements. Devitrification, vapor-phase crystallization, or fumarolic alteration may free the ore elements from the glassy matrix and place them in a form readily leached by percolating meteoric waters. Heat from the rhyolitic sheets drives such waters through the system, generally into and up the vents and out through the early tuffs. Secondary alteration zones (K-feldspar, sericite, silica, clays, fluorite, carbonate, and zeolites) and economic mineral concentrations may form in response to this low temperature (less than 200 C) circulation. After cooling, meteoric water continues to migrate through the system, modifying the distribution and concentration of the ore elements (especially uranium).

  10. Preliminary study of the uranium mineralization in the Eastern Belt, San Ramon, Oxapampa

    International Nuclear Information System (INIS)

    Valencia, Jacinto

    2013-01-01

    Permotriasic intrusive magmatic rocks of the eastern belt, consisting of San Ramon and Oxapampa granites, have a good favorability as fertile uranium rocks, one facie of red granite called monzo-granite; this condition is the result of the execution the cooperation project IPEN IAEA PER 2/16, ‘Improving the uranium potential of Peru’. The field work consisted of geological and radiometric review, with sampling of outcrop intrusive. The field radiometry and chemical analysis of the rock samples indicate the presence of radiometric and uranium anomalies, the petro-mineragraphyc study identified the presence of uranium ore, a phosphate hydrated uranium and copper, torbernite type, secondary mineral formed from leaching of primary uranium minerals in granite, the mineralization is found both in the granite and sedimentary rock contact. (author).

  11. Inventory of uranium resources potency at Kawat area, upper Mahakam, East Kalimantan detailed prospecting stage

    International Nuclear Information System (INIS)

    Ngadenin; I Gde Sukadana; Adi Gunawan Muhammad; Suripto

    2011-01-01

    Result of the general prospecting in East Kalimantan has found several radioactivity outcrop anomalies at upper Mahakam in the acid volcanic rock area which is approximately 25 km 2 in wide. The objective of the research is to know detailed geological information and characteristic of uranium mineralization. Method of this research are detailed geological, radiometric and geochemical mapping 1:10.000 on scale. The lithology of Kawat area is composed of seven units of rock. They are black clay unit, feldspatic sandstone unit, Nyaan rhyolite unit, lower andesite unit, Kawat rhyolite unit, upper andesite unit and tuffaceous sandstone unit. Evolving fault is dextral fault and normal fault. The trending of dextral fault is west-east and southwest-northeast, meanwhile the trending of normal faults is west-east and southwest northeast. There are two period of uranium mineralization occurrences in the area, the first is connected with the eruption of Nyaan rhyolite magma and the second is connected with the eruption of Kawat rhyolite magma. Uranium mineralization occurred in the stage of hydrothermal process and including in the pneumatogenic class of volcanogenic uranium deposits. This investigation has yielded two sites of potential uranium sector are the Nyaan sector with an area of about 6 km 2 and Kawat sector with an area of about 10 km 2 . (author)

  12. Discussion on causes and geochemical Characteristics of lamprophyre with uranium mineralization at the west of Mianning country, Sichuan Province

    International Nuclear Information System (INIS)

    Sun Yue; Li Juchu; Ding Jun; Yao Yifeng; Xiang Jie; Wang Zhanyong

    2014-01-01

    Moyite body of middle and late period is filled with normal lamprophyre and lamprophyre of uranium mineralization along cracks of Yan Mountain at the west of Mianning country, Sichuan Province. There are significant differences between the two types of lamprophyre, such as petrological characteristics, output location and scale, radioactive anomalies and geochemical characteristics. The main types of rocks are camptonite, mica-plagioclase lamprophyre and minette. Mineralized lamprophyre belongs to potassic-ultrapotassic lamprophyre according to macro-element analysis, while normal lamprophyre belongs to lamprophyre of calc-alkaline type. The transition elements allocation model are both mantle 'W' type with LILE (K, Rb, Ba) and HFSE (Nb, Ta, Zr, Hf). The rare earth elements allocation model of normal lamprophyre is Rightist LREE with δEu value of 0.73∼0.87. The rare earth elements allocation model of mineralized lamprophyre is 'M' type with δEu value of 0.28∼0.48. It indicates that lamprophyre is the result of partial melting of enriched mantle, and mineralized lamprophyre can be changed obviously by fluid flow. In the area, the type of uranium mineralization is that of vein rock, which is strictly controlled by mineralization lamprophyre, that is a new type of uranium mineralization in China. (authors)

  13. Ore bearing system and hydrological characteristics of mineralized sector in Hushiliang area

    International Nuclear Information System (INIS)

    Zhang Zhaolin; Liu Zhengbang; Miao Aisheng

    2010-01-01

    Hushiliang area is one of the best uranium ore bearing areas in Erdos basin from the point of fluvial sedimentary system and uranium geochemical environment, So far, three mineralized sector has been found that are Nalingou, Nongshengxin, Baobeigou. By using the first-hand data of uranium regional survey in this area lately and systematically comparing and analyzing of the hydrological structure in the mineralized sector of this area, the thesis ascertain the ore and water bearing fluid reservoir's spatial relationship generally, and argues that the Zhiluo formation ore and water bearing fluid reservoir in this area is a unified underwater ore bearing system, and the orebody's hydrological structure is propitious in the distributary channel and unpropitious in the main channel because of deep ore bearing layer to the ISL. (authors)

  14. Uranium and radium-226 in the environment of the post-uranium mining areas in Poland

    Energy Technology Data Exchange (ETDEWEB)

    Kardas, M.; Suplinska, M.; Ciupek, K. [Central Laboratory for Radiological Protection (Poland)

    2014-07-01

    The work carried out under the project NCBiR - 'Technologies Supporting Development of Safe Nuclear Power Engineering'; Task 3: Meeting the Polish nuclear power engineering's demand for fuel - fundamental aspects. Depending on location, environmental components may have different concentration levels of radionuclides. Main source of uranium and radium in the natural environment is atmospheric precipitation of the material resulting weathering and erosion of older rocks, enhanced due to human activity by fertilizers used in agriculture and fossil fuel combustion. The waste heaps and dumps, especially derived from post-uranium mining and phosphate fertilizer industry are the another source of uranium and radium in the environment. Our studies include post-uranium mining areas (inactive mines and waste dumps) and those adjacent meadows and grassland at the area of the Giant Mountains (Karkonosze Mountains) in the south-west Poland. Samples of soil and mineral material from mine shafts, water samples from ponds, streams and small rivers and vegetation samples (grass, alfalfa, birch leaves) were analyzed. Also, similar samples from agricultural regions of Poland were examined as a reference level. Uranium isotopes were determined by radiochemical method (ion exchange and extraction) and activity measurement using alpha spectrometry. Concentration of {sup 226}Ra was determined radiochemically using emanation method. For the validation of the method, determinations of uranium isotopes and radium-226 in reference samples were performed. Depending on location, the different levels of activity concentration of analyzed radionuclides were detected. Samples from the mine shafts and dumps, both water and soil, were characterized by the activity concentrations of {sup 238}U and {sup 226}Ra even by several orders higher than outside of those areas. The concentrations of the radionuclides in the areas located in further distances from mine and dumps are similar to

  15. Monitoring of uranium levels intake in some uranium-miners in egypt. Vol. 4

    Energy Technology Data Exchange (ETDEWEB)

    Anwar, S M [Nuclear Research Center, Atomic Energy Authority, Cairo (Egypt); Abdelmonem, A A; Aly, M M [Nuclear Materials Authority Cairo (Egypt)

    1996-03-01

    Uranium extraction results in conditions of intake of amounts of soluble uranium (U) salts and may reflect internal exposure levels. Proteinuria and albuminuria were also determined which reflect effect of U salts on kidney. These parameters can be used for checking the intake conditions and identifying the effect of absorbed U compounds on kidney. The U l eve in urine was evaluated in twenty male volunteers not involved in U mining processes, it ranged from 0.09 to 0.21 g/L. Twenty U miners were subjected to full clinical examination and urine analysis for estimation of U with six month interval. Significant differences were shown between the two groups. The same results were obtained for proteinuria and albuminuria, and only six workers appeared to have the signs of high U dust intake at the beginning of the experiment and decreased after six month by about 50% periodic estimation of the total annual effective dose equivalent in miners is determined to keep it always the annual limit of 20 mSv through improvement of the ventilation system and applying other effective precautions. 3 tabs.

  16. Monitoring of uranium levels intake in some uranium-miners in egypt. Vol. 4

    International Nuclear Information System (INIS)

    Anwar, S.M.; Abdelmonem, A.A.; Aly, M.M.

    1996-01-01

    Uranium extraction results in conditions of intake of amounts of soluble uranium (U) salts and may reflect internal exposure levels. Proteinuria and albuminuria were also determined which reflect effect of U salts on kidney. These parameters can be used for checking the intake conditions and identifying the effect of absorbed U compounds on kidney. The U l eve in urine was evaluated in twenty male volunteers not involved in U mining processes, it ranged from 0.09 to 0.21 g/L. Twenty U miners were subjected to full clinical examination and urine analysis for estimation of U with six month interval. Significant differences were shown between the two groups. The same results were obtained for proteinuria and albuminuria, and only six workers appeared to have the signs of high U dust intake at the beginning of the experiment and decreased after six month by about 50% periodic estimation of the total annual effective dose equivalent in miners is determined to keep it always the annual limit of 20 mSv through improvement of the ventilation system and applying other effective precautions. 3 tabs

  17. Radon-222 measurement in a uranium prospecting area in Brazil

    International Nuclear Information System (INIS)

    Binns, D.A.; Melo, V.P.; Gouvea, V.A.

    1996-01-01

    Rn-222 concentrations were determined in about 100 measuring points in an uranium prospecting area in the eastern part of Brazil. The single measurement results in open areas, identified as environmental points, present values between 4 ± 2 Bq/m -3 and 404 ± 16 Bq/m -3 with a mean value of 62 ± 10 Bq/m -3 . Comparing the mean values for each measuring point, the values obtained are between 15 ± 2 Bq/m -3 in the deposit for mineral samples and 245 ±7 Bq/m -3 for the central point, AN08, of the prospective mine. Makrofol SSNTD were used for the measurements and exposed for 120 days alternated periods from May 1992 to May 1994. (authors). 8 refs., 1 tab

  18. Maps compiled by the ESSO Minerals Company during their exploration program for uranium in South Africa

    International Nuclear Information System (INIS)

    Bertolini, A.; Pretorius, L.; Weideman, M.; Scheepers, T.

    1985-09-01

    The report is a bibliography of approximately one thousand maps. The maps contain information of ESSO Minerals Company's prospecting activities for mainly uranium in South Africa. ESSO explorated for uranium in the Karoo, Northwestern Cape and the Bushveld. The bibliography contains two indexes. The one is a list of prospects and projects as per geological province and the other is an alphabetic list of projects and prospects. Three geological provinces are distiguished, namely, the Bushveld province, Karoo province and Namaqualand province. The annotations contain information on the location and geographic area of the map, the name of the project or prospect, the title, a statement of resposibility (this includes the compiles i.e. geologists, and/or draftsmen), the statement of scale which is always expressed as a ratio, the date of compilation and/or revision and a few keywords to indicate the topical subject matter

  19. Uranium mineralization in the Rum Jungle-Alligator Rivers Province, Northern Territory, Australia

    International Nuclear Information System (INIS)

    Dodson, R.G.; Needham, R.S.; Wilkes, P.G.; Page, R.W.; Smart, P.G.; Watchman, A.L.

    1974-01-01

    Renewed interest in uranium exploration in northern Australia in the late 1960s led to the discovery of one of the most important uranium fields in the world. To obtain an understanding of the geological setting of the uranium deposits, and to provide guidelines for future exploration, the Bureau of Mineral Resources (BMR) undertook an investigation which included semi-detailed mapping, aided by geophysical surveys, isotopic dating, and stratigraphic drilling. From the results so far obtained and from the important data made available by mining companies engaged in exploration in the region, a pattern of uranium mineralization can be recognized, particularly in relation to the Lower Proterozoic sedimentation of the region. (author)

  20. Automated electron microprobe identification of minerals in stream sediments for the national uranium resources evaluation program

    International Nuclear Information System (INIS)

    Mosley, W.C. Jr.

    1979-01-01

    Over 500 stream sediment particles have been analyzed. About 96% have been identified as distinct minerals. Most of the others appeared to be mixtures. Only zinc-bearing gahnite had to be analyzed further for positive identification. Monazite and zircon were the only minerals with concentrations of uranium significantly above the detection limit. The Frantz Isodynamic Magnetic Separator isolated the monazite into the 1.0 fraction. Monazite particles in anomalous sediments contained up to 3.7 wt % uranium. This uranium concentration is unusually high for monazite, which normally has about 0.5 wt % uranium, and may be the cause of the anomaly

  1. On the geology of the uranium mineralization in the Swiss Alps

    International Nuclear Information System (INIS)

    Gillieron, F.

    1988-01-01

    Numerous radiometric anomalies and several uranium occurrences were found in the Swiss Alps by systematic prospecting of selected areas carried out between 1957 and 1984. Most of the uranium indications lie in a rather narrow belt that follows roughly the valleys of the Rhone und of the Rhine Anterior, from Martigny onto Ilanz and extending northwards towards the Lake of Walenstadt. The uranium occurrences were found in the following geological environments: - permocarboniferous continental, variably metamorphosed series, belonging either to the formation of the 'Verrucano' or to the Penninic St. Bernhard nappe; - muscovite-chlorite-albite gneisses belonging to the pre-Westphalian basement of the St. Bernhard nappe; - muscovite-chlorite gneisses and phyllites of the Hercynian Tavetsch massiv; - muscovite-biotite gneisses within the southern border of the Aar massif; - Vallorcine granite of the Auguilles-Rouges massiv and polymetamorphic biotite gneisses along its northwestern contact zone. The possible geological (or 'in situ') resources are estimated to be 50-250 tonnes uranium in each one of the investigated mineralization zones of some importance; the respective estimated grades are 50-250 ppm U. Therefore the occurrences are actually of no economic value. (author) 25 figs., 1 tab., refs

  2. Uranium mineralization rules controlled by sedimentation in Bayanwula region in Erlian basin

    International Nuclear Information System (INIS)

    Lu Chao

    2012-01-01

    Uranium mineralization is closely related to sedimentation in Bayanwula region in Erlian Basin. Clarifying the relation of sedimentation and Uranium Mineralization Through detailed analysis of vertical sequences, stratigraphic correlation and the heterogeneity of sand body. Study show that the of development characteristics of sequences of Bayanwula region control the vertical positioning of favorable sand, the skeleton sand bodies of LST in upper Saihan formation is the most favorable reservoir space for uranium. Uranium mineralization is closely related with the heterogeneity of the sand bodies of upper Saihan formation. the heterogeneity of Sand body is mainly reflected in plane and vertical. In plane, with the research of the sand distributed system of upper Saihan formation, the change position of sandstone thickness and sand rate, the position of the variation of shape and trend of sand body, and the change position of sand body character and genesis are most favorable for uranium mineralization. In vertical, the number of layers and thickness of isolated barrier bed not only control the thickness of oxide sandstone. but also they are associated with the distribution of uranium mineralization; The evolution of sedimentary basins created Bayanwula uranium deposits. There is a second order sequence boundary between the upper Saihan formation and the Erlian formation of Late Cretaceous, which is a long-term exposure and erosion unconformity, resulting in the partly erosion of the upper Saihan formation, providing the best conditions of the penetration of the uranium-bearing oxygen water and the development of phreatic oxidation and interlayer oxidation zone. (author)

  3. Lichens as biomonitors of uranium in the Balkan area

    International Nuclear Information System (INIS)

    Loppi, S.; Riccobono, F.; Zhang, Z.H.; Savic, S.; Ivanov, D.; Pirintsos, S.A.

    2003-01-01

    Widespread contamination by depleted uranium was not detected in the Balkan area. - The contribution of the conflict of 1999 to the environmental levels of uranium in the Balkan area was evaluated by means of lichens used as biomonitors. The average U concentration found in lichens in the present study was in line with the values reported for lichens from other countries and well below the levels found in lichens collected in areas with natural or anthropogenic sources of U. Measurement of isotopic ratios 235 U/ 238 U allowed to exclude the presence of depleted uranium. According to these results, we could not detect widespread environmental contamination by depleted uranium in the Balkan area

  4. Mineralization mechanism and geodynamic setting of No. 337 deposit in Xiazhuang uranium orefield

    International Nuclear Information System (INIS)

    Zhang Zhanshi; Wu Jianhua; Liu Shuai; Hua Renmin

    2009-01-01

    Uranium deposit No.337 in Xiazhuang uranium orefield has been regarden as a representative of the earliest forming, relatively high temperature and short time gap between the formation of pluton and the mineralization. But the latest study revealed that the formation age of the Maofeng pluton, which is the most important uranium host granite in Xiazhuang uranium orefield, is 206-238.2 Ma by LA-ICP-MS zircon dating, while the secondary origin muscovite in Maofeng pluton has the age of 131-136 Ma by 40 Ar/ 39 Ar dating which correspond to the main mineralization age of 130.3-138 Ma in uranium deposit No.337. In Guidong granitic complex, Maofeng pluton shown some unique characteristics. It has the Al 2 O 3 /TiO 2 ratio that infers the lowest forming temperature, the lowest ΣREE and it is the only pluton which presents typical tetrad effects of REE, it is also shown a varying δ 18 O values and the lowest( 87 Sr/ 86 Sr) i values. According to the above findings, a concept model of uranium mineralization and geodynamic setting for No.337 uranium deposit might be presented: in late or post-collision stage of Indosinian orogeny, strongly peraluminous granite of Maofeng pluton formed from partial melting of uranium rich formations. Intrusion of maficdyke in late Yanshanian Period(<140 Ma), caused large fluid movement. Uranium was reactivated and extracted from the altered granite,and precipitated in some favorite places to form uranium ore bodies. Uranium deposit No.337 is the typical representative of the first stage uranium mineralization in Xiazhuang uranium orefield. (authors)

  5. New Mexico Known Mineral Deposit Areas

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — This dataset contains all Known Mineral Deposit Areas in the state of New Mexico. It is in a vector digital structure digitized from a 1:500,000 scale map of the...

  6. Geochemistry of the uranium mineralized Achala granitic complex, Argentina: Comparison with Hercynian peraluminous leucogranites of western Europe

    International Nuclear Information System (INIS)

    Cuney, M.; Leroy, J.; Valdiviezo, P.A.; Daziano, C.; Gamba, M.; Zarco, A.J.; Morello, O.; Ninci, C.; Molina, P.

    1989-01-01

    The Achala granitic complex belongs to the Sierras Pampeanas Hercynian belt, located west of the city of Cordoba, Argentina. This complex is very large (about 100 km N-S and 40 km E-W) and is composed of biotite, biotite with muscovite and muscovite with tourmaline granites intruded in amphibolite grade metamorphic rocks, along a main N 20 deg. E structural direction. Numerous uranium mineralizations are located within the granitic massif and tungsten mineralizations are present both in the enclosing metamorphic rocks and in the granite. The geochemistry of the granite has been studied in four test areas (Southern, Copina, Median and Don Vincente). Two test areas (Median and Don Vicente) present clear evidence of hydrothermal alteration: albitization and dequartzification similar to the French 'episyenites', silicification and argillic alteration. Potassic alteration is rare and weakly developed. The two test areas with hydrothermal alteration present a high uranium geochemical background (5-30 ppm). High thorium contents (up to 65 ppm) are essentially observed in the less differentiated granites of the Copina and Median areas. Thorium/uranium ratios are highly variable (1-10). Uranium minerals are related to different environments - (1) apatite-biotite enclave mineralized with uraninite and uranothorite, (2) gneiss from the contact metamorphism rim, (3) granite with incipient dequartzification, (4) granite associated with albitic episyenites and (5) silicified granite - but are all located in the two test areas presenting clear evidence of hydrothermal alteration. The three petrogenetic events are clearly related to very different mechanisms, separated from each other by several tens of millions of years in the west European Hercynian chain. In the same period the same succession of events leading to uranium deposits is observed in Argentina. 34 refs, 10 figs, 1 tab

  7. Comparison studies adsorption of thorium and uranium on pure clay minerals and local Malaysian soil sediments

    International Nuclear Information System (INIS)

    Syed, H.S.

    1999-01-01

    Adsorption studies of thorium and uranium radionuclides on 9 different pure clay minerals and 4 local Malaysian soil sediments were conducted. Solution containing dissolved thorium and uranium at pH 4.90 was prepared from concentrate sludges from a long term storage facility at a local mineral processing plant. The sludges are considered as low level radioactive wastes. The results indicated that the 9 clay minerals adsorbed more uranium than thorium at pH ranges from 3.74 to 5.74. Two local Malaysian soils were observed to adsorb relatively high concentration of both radionuclides at pH 3.79 to 3.91. The adsorption value 23.27 to 27.04 ppm for uranium and 33.1 to 50.18 ppm for thorium indicated that both soil sediments can be considered as potential enhanced barrier material for sites disposing conditioned wastes containing uranium and thorium. (author)

  8. Early lung cancer detection in uranium miners with abnormal sputum cytology

    International Nuclear Information System (INIS)

    Saccomanno, G.

    1992-08-01

    This work supported by the United States of Energy, continues to add data on the health affects of cigarette smoking and radon exposure on uranium miners. Since the last Technical Progress Report in July or 1991, 537 sputum cytology samples have been collected on the 300 uranium workers in the surveillance study. To date there are 436 lung cancer cases in the Uranium Miner Tumor Registry with diagnostic slides from surgery and/or autopsy; an additional 40 cases have been diagnosed with sputum cytology only. In March of 1991 the Geno Saccomanno Uranium Workers Archive was established at St. Mary's Hospital and Medical Center as a depository for biological specimens and epidemiological data from the 17,700 uranium miners who have been a part or the study

  9. Relative risk models of lung cancer in uranium miners

    Energy Technology Data Exchange (ETDEWEB)

    Tomasek, L [National Radiation Protection Institute, Prague (Czech Republic); Placek, V [Inst. for Expertises and Emergencies, Pribram-Kamenna (Czech Republic)

    1996-12-31

    The study population of the S cohort (studies of underground miners of uranium and other substances as the source of information on long term effects of exposure to radon and its progeny) involve uranium miners, that started underground work at the Jachymov and Horni Slavkov mines in the period 1978-1959, and had worked at least for four years. A total 4320 men satisfied these criteria. During the decade up to 1990, follow-up of the cohort mainly relied on the national population registry. In order to improve the follow-u, a series of additional checks were conducted: in the files of the Czech and Slovak Pensions Offices, by local enquires, and by direct correspondence. These additional efforts resulted in an increase of more than 10% in the numbers of known men to have died or emigrated. An exceptional feature of the S study is the large number of measurements of radon concentrations made in each mine-shaft (mean number per year and shaft was 223 in the period 1949-1960). Each man`s annual exposures to radon progeny in terms of working levels were estimated combining measurement data with men`s employment details. The excess relative risk models were used in the form RR = c(1 + ERR(w,x)), where ERR is excess relative risk, w and x denote exposure history and modifying variable, and c is an intercept term that allows the mortality rate for `unexposed` cohort to differ from that in the general population. The increased mortality (O/E=1.58; where O is observed and E is expected cases among collected death cases in the cohort) in the cohort, generally, somewhat lower ratios than one reflect the non-industrial character of the region, with the exception of lung cancer in man. The differences in the O/E ratios for lung cancer among the separate communities indicate that even in the situation of generally lower mortality, the dependence of lung cancer mortality on radon exposure cannot be excluded. 3 tabs., 6 refs.

  10. Assistance to former uranium miners. The work of the central support center Wismut (ZeBWis)

    International Nuclear Information System (INIS)

    Piekarski, Claus; Otten, Heinz

    2015-01-01

    As a consequence of the German reunification the legal accident insurance was responsible for the health damage of uranium miners in the former DDR Wismut company. The contribution discusses the manifold challenges to provide care for the former Wismut employees.

  11. The German uranium miners study. Knowledge for radiation protection; Die deutsche Uranbergarbeiterstudie. Erkenntnisse fuer den Strahlenschutz

    Energy Technology Data Exchange (ETDEWEB)

    Kreuzer, Michaela; Schnelzer, Maria [Bundesamt fuer Strahlenschutz, Salzgitter (Germany). Fachbereicih fuer Strahlenschutz und Gesundheit

    2015-07-01

    The Wismut cohort comprises about 60.000 former Wismut employees. Due the size and the large surveillance time from 1946 to 2013 the German uranium miners study is of high significance and worldwide unique.

  12. Sulphatising roasting of a Greenlandic uranium ore, reactivity of minerals and recovery

    International Nuclear Information System (INIS)

    Gamborg Hansen, J.K.

    1977-03-01

    Uranium in the lujavrite ore from Kvanefjeld, South Greenland, can be solubilised by sulphatising roasting at 700degC. The reactivity of various lujavrite minerals in the roasting process and the mechanism of the reaction were investigated by X-ray diffraction, optical microscopy, electron microprobe, thermal analysis, Moessbauer and infrared spectroscopy. Soluble sulphates are formed on the surface of the grains; an outer zone of the grains is transformed; usually a core remains unchanged. Variations in uranium recovery can be explained by variations in the contents of the uranium-bearing minerals, steenstrupine and uranium-containing pigmentary material (altered Zr containing silicate minerals), and in the degree of alteration os steenstrupine. Characterization of these minerals required many qualitative and a few quantitative electron microprobe analyses. (author)

  13. Uranium mineralization in fluorine-enriched volcanic rocks

    International Nuclear Information System (INIS)

    Burt, D.M.; Sheridan, M.F.; Bikun, J.; Christiansen, E.; Correa, B.; Murphy, B.; Self, S.

    1980-09-01

    Several uranium and other lithophile element deposits are located within or adjacent to small middle to late Cenozoic, fluorine-rich rhyolitic dome complexes. Examples studied include Spor Mountain, Utah (Be-U-F), the Honeycomb Hills, Utah (Be-U), the Wah Wah Mountains, Utah (U-F), and the Black Range-Sierra Cuchillo, New Mexico (Sn-Be-W-F). The formation of these and similar deposits begins with the emplacement of a rhyolitic magma, enriched in lithophile metals and complexing fluorine, that rises to a shallow crustal level, where its roof zone may become further enriched in volatiles and the ore elements. During initial explosive volcanic activity, aprons of lithicrich tuffs are erupted around the vents. These early pyroclastic deposits commonly host the mineralization, due to their initial enrichment in the lithophile elements, their permeability, and the reactivity of their foreign lithic inclusions (particularly carbonate rocks). The pyroclastics are capped and preserved by thick topaz rhyolite domes and flows that can serve as a source of heat and of additional quantities of ore elements. Devitrification, vapor-phase crystallization, or fumarolic alteration may free the ore elements from the glassy matrix and place them in a form readily leached by percolating meteoric waters. Heat from the rhyolitic sheets drives such waters through the system, generally into and up the vents and out through the early tuffs. Secondary alteration zones (K-feldspar, sericite, silica, clays, fluorite, carbonate, and zeolites) and economic mineral concentrations may form in response to this low temperature (less than 200 C) circulation. After cooling, meteoric water continues to migrate through the system, modifying the distribution and concentration of the ore elements

  14. Kidney cancer mortality and ionizing radiation among French and German uranium miners

    International Nuclear Information System (INIS)

    Drubay, Damien; Ancelet, Sophie; Laurier, Dominique; Rage, Estelle; Acker, Alain; Kreuzer, Michaela

    2014-01-01

    The investigation of potential adverse health effects of occupational exposures to ionizing radiation, on uranium miners, is an important area of research. Radon is a well-known carcinogen for lung, but the link between radiation exposure and other diseases remains controversial, particularly for kidney cancer. The aims of this study were therefore to perform external kidney cancer mortality analyses and to assess the relationship between occupational radiation exposure and kidney cancer mortality, using competing risks methodology, from two uranium miners cohorts. The French (n = 3,377) and German (n = 58,986) cohorts of uranium miners included 11 and 174 deaths from kidney cancer. For each cohort, the excess of kidney cancer mortality has been assessed by standardized mortality ratio (SMR) corrected for the probability of known causes of death. The associations between cumulative occupational radiation exposures (radon, external gamma radiation and long-lived radionuclides) or kidney equivalent doses and both the cause-specific hazard and the probability of occurrence of kidney cancer death have been estimated with Cox and Fine and Gray models adjusted to date of birth and considering the attained age as the timescale. No significant excess of kidney cancer mortality has been observed neither in the French cohort (SMR = 1.49, 95 % confidence interval [0.73; 2.67]) nor in the German cohort (SMR = 0.91 [0.77; 1.06]). Moreover, no significant association between kidney cancer mortality and any type of occupational radiation exposure or kidney equivalent dose has been observed. Future analyses based on further follow-up updates and/or large pooled cohorts should allow us to confirm or not the absence of association. (orig.)

  15. Kidney cancer mortality and ionizing radiation among French and German uranium miners

    Energy Technology Data Exchange (ETDEWEB)

    Drubay, Damien; Ancelet, Sophie; Laurier, Dominique; Rage, Estelle [Institut de Radioprotection et de Surete Nucleaire (IRSN), Laboratory of Epidemiology, Fontenay-aux-Roses cedex (France); Acker, Alain [AREVA NC, Paris (France); Kreuzer, Michaela [Federal Office for Radiation Protection and Health, Department of Radiation Protection and Health, Neuherberg (Germany)

    2014-08-15

    The investigation of potential adverse health effects of occupational exposures to ionizing radiation, on uranium miners, is an important area of research. Radon is a well-known carcinogen for lung, but the link between radiation exposure and other diseases remains controversial, particularly for kidney cancer. The aims of this study were therefore to perform external kidney cancer mortality analyses and to assess the relationship between occupational radiation exposure and kidney cancer mortality, using competing risks methodology, from two uranium miners cohorts. The French (n = 3,377) and German (n = 58,986) cohorts of uranium miners included 11 and 174 deaths from kidney cancer. For each cohort, the excess of kidney cancer mortality has been assessed by standardized mortality ratio (SMR) corrected for the probability of known causes of death. The associations between cumulative occupational radiation exposures (radon, external gamma radiation and long-lived radionuclides) or kidney equivalent doses and both the cause-specific hazard and the probability of occurrence of kidney cancer death have been estimated with Cox and Fine and Gray models adjusted to date of birth and considering the attained age as the timescale. No significant excess of kidney cancer mortality has been observed neither in the French cohort (SMR = 1.49, 95 % confidence interval [0.73; 2.67]) nor in the German cohort (SMR = 0.91 [0.77; 1.06]). Moreover, no significant association between kidney cancer mortality and any type of occupational radiation exposure or kidney equivalent dose has been observed. Future analyses based on further follow-up updates and/or large pooled cohorts should allow us to confirm or not the absence of association. (orig.)

  16. Structure and fluid evolution of Yili basin and their relation to sandstone type uranium mineralization

    International Nuclear Information System (INIS)

    Wang Juntang; Wang Chengwei; Feng Shirong

    2008-01-01

    Based on the summary of strata and structure distribution of Yili basin, the relation of structure and fluid evolution to sandstone type ur alum mineraliation are analyzed. It is found that uranium mineralization in Yili basin experienced ore hosting space forming, pre-alteration of hosting space, hosting space alteration and uranium formation stages. (authors)

  17. Discussion on several problems on the mineralization of paleo-channel sandstone type uranium deposits

    International Nuclear Information System (INIS)

    Huang Shijie

    1997-01-01

    On the basis of comprehensively analyzing paleo-channel sandstone type uranium deposits at home and abroad, the author discusses the division of mineralization types of paleo-channel sandstone type uranium deposits, and analyzes the metallogenic geologic conditions such as regional geologic background, climatic and geomorphological conditions, basement and sedimentary cover, characteristics of paleo-valley and paleo-channel, mineralization features as well as epigenetic metallogenic process. Future prospecting direction is also proposed

  18. Analyzing occupational cohort data: application to US uranium miners

    International Nuclear Information System (INIS)

    Whittemore, A.S.; McMillan, A.

    1982-01-01

    This paper presents methodological issues concerning the analysis of occupational mortality data. It summarizes pros and cons of three types of analysis: the person-years method, the cohort method, and the case-control method, and notes the common theoretical basis underlying cohort and case-control methods. Both these methods assume that occupational exposures act multiplicatively on either: (a) age-specific mortality rates; or (b) odds-ratios of death during follow-up. Both methods allow relative risk estimation by maximizing a partial or conditional likelihood under assumption (a), and an unconditional likelihood under assumption (b). the case-control method involves less data handling and computation than does the cohort method. This feature, useful when dealing with very large cohorts whose exposures vary with time, is purchased at the price of some decreased sensitivity to detect moderate to large relative risks associated with infrequently occurring exposure categories. The paper illustrates the utility and limitations of the case-control approach by applying it to lung cancer mortality versus exposures to radon-daughters and cigarette smoke among US uranium miners

  19. Uranium occurrences of the Thunder Bay-Nipigon-Marathon area

    International Nuclear Information System (INIS)

    Scott, J.F.

    1987-01-01

    During the 1981, 1982 and 1983 field seasons an inventory of all known uranium occurrences in the North Central Region of Ontario was undertaken. Three major categories of uranium occurrences were identified: uranium associated with the rocks of the Quetico Subprovince; uranium associated with the Proterozoic/Archean unconformity; and uranium associated with alkalic and carbonatite rocks of Late Precambrian age. Occurrences associated with the Quetico Belt are in white, albite-quartz-muscovite pegmatites. Occurrences associated with the Proterozoic/Archean unconformity are usually of high gradee (up to 12% U 3 O 8 ), nearly always hematized and are related to fault or shear zones proximal to the unconformity. Although of high grade, many of the unconformity related occurrences are very narrow (<1 m). Alkalic and carbonatite rocks of Late Precambrian age are an important source of uranium but possible metallurgical problems might downgrade their potential. The Quetico Subprovince is anomalously high in background uranium, and therefore contains important source rocks for uranium. Areas that have the highest potential for uranium deposits in the North Central Region are the Nipigon Basin area, and the areas underlain by the Gunflint and Rove Formations. All the high grade vein-type uranium deposits related to the unconformity are found within the Nipigon Basin. 126 refs

  20. Hyperspectral Alteration Information from Drill Cores and Deep Uranium Exploration in the Baiyanghe Uranium Deposit in the Xuemisitan Area, Xinjiang, China

    Directory of Open Access Journals (Sweden)

    Qing-Jun Xu

    2017-05-01

    Full Text Available The Baiyanghe uranium deposit is a currently important medium-sized deposit in the Xuemisitan area, Xinjiang. The hydrothermal alteration in this deposit is closely related to the uranium mineralization of the deposit. In this study, hyperspectral data are collected from drill cores in the Baiyanghe uranium deposit using a FieldSpec4 visible-shortwave infrared spectrometer to study the hydrothermal alteration. The results reveal that the altered mineral assemblages have obvious zonation characteristics: (1 the upper section comprises long-wavelength illite and minor hematite and montmorillonite; (2 the middle section contains three types of illite (long-, medium- and short-wavelength illite and hematite; and (3 the lower section includes short-wavelength illite, chlorite and carbonate. Additionally, the variety in the characteristic absorption-peak wavelength of illite at 2200 nm gradually shifts to shorter wavelength and ranges between 2195 nm and 2220 nm with increasing depth, while the SWIR-IC (short-wavelength infrared illite crystallinity, a dimensionless quantity of the drill holes gradually increases from 0.2 to 2.1. These patterns reflect the hydrothermal fluid activity in the deposit, which features relatively high-temperature, high-pressure hydrothermal fluid in the deeper section and low-temperature, low-pressure hydrothermal fluid in the shallower section. Additionally, the uranium mineralization is located near the fracture zone, which represents the center of hydrothermal fluid activity or mineralization. This area has abundant alteration minerals, and the minerals illite (short- and medium-wavelength, hematite and fluorite can be used as uranium-prospecting indicators for uranium exploration in the deeper sections of the Baiyanghe uranium deposit.

  1. Assessment of role of metamorphic remobilization in genesis of uranium ores from Ralston Buttes area, Colorado

    International Nuclear Information System (INIS)

    Chatterjee, S.K.

    1984-01-01

    The Ralston Buttes mining district, the principal source of commercial uranium in the Front Range since the late 1940s, is located northeast of Golden and southeast of the Front Range mineral belt. Uranium ore occurs in veins emplaced in fault breccia in Precambrian metamorphic rocks. The progenitors of the metamorphic rocks are a possible source for the uranium. Hornblende gneisses of the Idaho Springs Formation is the major rock type in the area, thus its origin is a major consideration in assessing the quantity of uranium that might have been contributed by metamorphic processes. To evaluate this, 41 rock samples (19 hornblende gneisses, 7 biotite gneisses, 5 chlorite gneisses, and 10 metapelites) were analyzed for major elements, and 3 rock samples (16 hornblende gneisses, 8 biotite gneisses, 4 chlorite gneisses, and 5 mica schists) were analyzed for trace metals (Rb, Sc, Zr, V, Ni, Co, Cr, Ba, U, and Th). Four samples of hornblende gneiss and 1 sample of mica schists were also analyzed for rare earth elements. Major elements are rare earth data indicate that the hornblende gneiss was derived from sediments and tholeiitic basalts. Trace element data suggest a volcanic provenance for these sediments. Rare earth patterns and uranium and thorium abundances of metapelites are similar to average North American shales. Low uranium and thorium values and low thorium-uranium ratios in hornblende gneisses and mica schists preclude large-scale uranium remobilization during metamorphism of these source rocks

  2. Identification and quantitative grade estimation of Uranium mineralization based on gross-count gamma ray log at Lemajung sector West Kalimantan

    International Nuclear Information System (INIS)

    Adi Gunawan Muhammad

    2014-01-01

    Lemajung sector, is one of uranium potential sector in Kalan Area, West Kalimantan. Uranium mineralization is found in metasiltstone and schistose metapelite rock with general direction of mineralization east - west tilted ± 70° to the north parallel with schistocity pattern (S1). Drilling evaluation has been implemented in 2013 in Lemajung sector at R-05 (LEML-(S1). Drilling evaluation has been implemented in 2013 in Lemajung sector at R-05 (LEML-gamma ray. The purpose of this activity is to determine uranium mineralization grade with quantitatively methode in the rocks and also determine the geological conditions in sorounding of drilling area. The methodology involves determining the value of k-factor, geological mapping for the sorounding of drill hole, determination of the thickness and grade estimation of uranium mineralization with gross-count gamma ray. Quantitatively from grade estimation of uranium using gross-count gamma ray log can be known that the highest % eU_3O_8 in the hole R-05 (LEML-40) reaches 0.7493≈6354 ppm eU found at depth interval from 30.1 to 34.96 m. Uranium mineralization is present as fracture filling (vein) or tectonic breccia matrix filling in metasiltstone with thickness from 0.10 to 2.40 m associated with sulphide (pyrite) and characterized by high ratio of U/Th. (author)

  3. Rare earths from uranium mineralization occurrences in the Permian of the Gemericum, the Western Carpathians

    International Nuclear Information System (INIS)

    Rojkovic, I.; Medved, J.; Walzel, E.; Posta, S.; Sulovsky, P.

    1989-01-01

    Uranium mineralization in the Permian of the Gemericium is accompanied by apatite, monazite and xenotime. The study of rare earth elements distribution is based on the results of instrumental neutron activation analysis and optical emission spectroscopy analysis of rocks and energy-dispersive X-ray microanalyses of minerals. The main light rare earth elements bearing mineral is monazite; for heavy rare earth elements it is xenotime. The rocks accompanying uranium mineralization have increased rare earth elements contents. The mobilization and concentration of uranium mineralization took place during the Alpine metallogenic processes. These processes were also associated with rare earth elements mobilization is which total and selective enrichment in light rare earth elements and heavy rare earth elements was observed. (author). 12 figs., 6 tabs., 5 refs

  4. Results of uranium hydrogeochemical and stream sediment reconnaissance of the San Juan area, southwestern Colorado

    International Nuclear Information System (INIS)

    Maxwell, J.C.

    1977-01-01

    During June-July 1976, 1706 water samples and 1982 sediment samples were collected from 1995 sites in the San Juan Mountains area and analyzed for uranium. The area includes the southern third of the Colorado mineral belt which has yielded rich ores of gold, silver, copper, lead, zinc, and molybdenum. The broadly domed mountains are capped by 2500 m of Tertiary volcanics, deeply eroded to expose a Precambrian crystalline core. Adjacent plateaus underlain by Mesozoic sedimentary rocks were included in the reconnaissance. Average value of uranium in water samples from mountains was less than 0.5 ppb, from plateaus was 1 to 2 ppb, and from Mancos shale areas exceeded 2 ppb. Anomalous sediment samples, 40 ppM uranium, came from near Storm King Mountain and upper Vallecito Creek. Other anomalous areas, including the Lake City mining district, were well defined by 4 to 30 ppM uranium in sediment and 3 to 30 ppB uranium in water. Above-average concentrations of uranium not previously reported indicate areas favorable for detailed exploration

  5. Results of uranium HSSR survey of the San Juan area southwestern Colorado

    International Nuclear Information System (INIS)

    Maxwell, J.C.

    1977-01-01

    During June--July 1976, 1706 water samples and 1982 sediment samples were collected from 1995 sites in the San Juan Mountains area and analyzed for uranium. The area includes the southern third of the Colorado mineral belt which has yielded rich ores of gold, silver, copper, lead, zinc, and molybdenum. The broadly domed mountains are capped by 2500 m of Tertiary volcanics, deeply eroded to expose a Precambrian crystalline core. Adjacent plateaus underlain by Mesozoic sedimentary rocks were included in the reconnaissance. Average value of uranium in water samples from mountains was less than 0.5 ppB, from plateaus was 1 to 2 ppB, and from Mancos shale areas exceeded 2 ppB. Anomalous sediment samples, 40 ppM uranium, came from near Storm King Mountain and upper Vallecito Creek. Other anomalous areas, including the Lake City mining district, were well defined by 4 to 30 ppM uranium in sediment and 3 to 30 ppB uranium in water. Above-average concentrations of uranium not previously reported indicate areas favorable for detailed exploration

  6. Wall-rock alteration and uranium mineralization in parts of Thomas Range Mining District, San Juan County, Utah, and its significance in mineral exploration

    International Nuclear Information System (INIS)

    Mohammad, H.

    1985-01-01

    Several important uranium deposits associated with fluorspar and beryllium are located in parts of Thomas Range area. the mineralization is found in dolomites and dolomitic limestones of Paleozoic age and sandstones, tuffs, and rhyolites belonging to the Tertiary Spor Mountain and Topaz Mountain Formations. The pipes, veins, and nodules of fluorspar are replaced by uranium. Veins and disseminations of radioactive fluorspar and opal and overgrowths of secondary minerals are found in rhyolites, tuffs, carbonate rocks, and breccias. The radioactivity in sandstones and conglomerates emanates from weeksite, beta-uranophane, zircon, gummite, and zircon. It also occurs as highly oxidized rare aphanitic grains disseminated in a few ore deposits. The results of the present investigations may influence the initiation of future exploration programs in the Thomas Range mining district. Hydrothermal fluids of deep-seated magmatic origin rich in U, V, Th, Be, and F reacted with the country rocks. The nature and sequence of wall-rock alteration and its paragenetic relationship with the ores have been determined. The mineralization is confined to the altered zones. The ore bodies in the sedimentary rocks and the breccias are located in the fault zones. More than 1000 faults are present in the area, greatly complicating mineral prospecting. The wall-rock alteration is very conspicuous and can be used as a valuable tool in mineral exploration

  7. Mineral resource potential map of the Vermilion Cliffs-Paria Canyon instant study area, Coconino County, Arizona, and Kane County, Utah

    Science.gov (United States)

    Bush, Alfred L.; Lane, Michael

    1982-01-01

    In general, the mineral potential of the study area is low; in the past the area has yielded only several hundred tons of uranium ore, and there have been a number of unsuccessful efforts to produce gold.

  8. Characteristics of sandstone-type uranium mineralization and ore-controlling factors in Wukurqi ore district at southern margin of Yili basin, Xinjiang

    International Nuclear Information System (INIS)

    Li Xigen

    2002-01-01

    With the theories of hydrogenic uranium deposit in the nineties, Wukurqi ore district as a new area was found by the regional prediction and prospecting. Specially, through uranium ore prospecting of about three years, certain prospective reserves are generally controlled in the area. These reserves are hosted in V cyclothem of Middle-Lower Jurassic series, and some prospective reserves are hosted in II and VII cyclothems. By analyzing and summarizing characteristics of sandstone-type uranium mineralization and its ore-controlling factors in Wukurqi ore district, the author provides a foundation for developing further prospecting in this area

  9. Genesis of Uranium in the younger granites of gabal abu hawis area, central eastern desert of Egypt

    International Nuclear Information System (INIS)

    Ahmed, F.Y.; Moharem, A.F.

    2003-01-01

    The younger granites cropping out in gabal abu hawis area are considered as uraniferous (fertile) granites (the fertile is mainly is mainly attributed to presence of radioactive zircon). Abu hawis granitic pluton is dissected by joints faults of different trends forming two mineralized shear zones in the northern peripheries and southern border. The younger granites hosting uranium mineralizations along the two mineralized shear zones. The uranium minerals include uranophane and carnotite. The altered granites have much lower Th/U ratios (0.03-0.10) than those of the fresh granites (1.69-2.05), indicating strong mobilization of uranium in this pluton by super-heated solutions that resulted from supergence meteoric water as well as U-addition by hypogene fluids. These solutions could pass through the structural network of fractures, joints and fault planes and have leached some of labile uranium from the surrounding rocks and/or the younger granites themselves. Then, changing in the physicochemical conditions of these solutions caused uranium precipitation as uranium minerals filling the cracks in the rock and/or adsorbed on the surface of clay minerals and iron oxides in the two shear zones

  10. Forecast of promising areas for uranium prospection at the metamorphic Massif of Isla de la Juventud

    International Nuclear Information System (INIS)

    Gongora, L.E.; Macola, E.; Sanchez, J.; Torres, J.C.; Alaminos, C.; LLanes, A.; Morales, M.

    1995-01-01

    A mineralization conceptual model for uranium of the metamorphic Massif of Isla de la Juventud was established taking into account the study of the geological and metallogenic characteristic of the territory. The determined indications of mineralization were plotted on the geological map in order to conform a forecasting map and the selection of 22 hypothetical promising areas was carried out. As result of the field words three really promising areas were selected. A group of exploration techniques needed to evaluate the targets areas is presented

  11. Characteristics of uranium mineralization and prospecting direction in the northeast of Ordos basin

    International Nuclear Information System (INIS)

    Li Xide

    2012-01-01

    With greenness considered a kind of symbol of ancient interformational oxidation in under subsegment of Zhiluo Group in the northeast of Ordos Basin, Zaohuohao Uranium deposit , Husiliang, Hantaimiao, and Chaidenghao Uranium mines have been founded one after the other in the exploration process of Sandstone-type uranium deposits and achieved results. The thickness in different sections of the ore bearing sand bodies, Output features in space of ancient interformational oxidation, ore body scales, and configuration are more difference. In the paper some characteristics of Uranium mineralization are summarized, and preliminary proposals are given on prospecting direction in different sections. (author)

  12. Mining and miners of the French uranium - III - The time of great adventures (1959 - 1973)

    International Nuclear Information System (INIS)

    Paucard, A.

    1996-07-01

    This third volume of ''Mining and miners of the French uranium'' describes the historical, political and strategical aspects of the French experience in uranium prospecting and exploitation during the period 1959 -1973. This volume comprises two parts. Part one concerns the political and strategical aspects of the French uranium policy according to the economical and geopolitical context of this period. The second part describes the uranium exploration and exploitation works in the French territory and overseas (Madagascar, Gabon, Niger, Central African Republic, Canada, West Africa, Cameroon, Congo, Turkey, Iran, Afghanistan, Pakistan, India, Argentina, Brazil, Australia, Indonesia..). A chapter is devoted to the miners' life and working conditions during this period. The complete volume is written using unpublished bibliographic sources from the CEA and Cogema and from personal miners' archives. It is full of anecdotes and extracts of letters and reports and written with a saga novel style but refers continuously to the geological context of each deposit. (J.S.)

  13. Tianmujian caldera. A potential area for locating rich and large uranium deposit

    International Nuclear Information System (INIS)

    Lin Ziyu; Xu Jinshan; Chen Mingzhuo; Jiang Jinyuan; Fan Honghai; Cheng Qi

    2001-01-01

    Based on the comprehensive analysis on geologic, remote sensing, gravimetric, magnetic and geochemical data, and the field geologic investigation, the author has preliminarily ascertained the formation and the distribution characteristics of the Tianmujian caldera, and recognized the porphyroclastic lava system which is extensively distributed in the area. The authors suggest that the Tianmujian volcanic basin experienced two evolution stages--the thermal uplifting and the formation of caldera, that large concealed uranium-rich granitic massif occurs in the area, and during the vertical evolution process the uranium showed its concentration in the lower part and depletion in the upper part, and large amount of ore-forming material moved upward along with the magmatic hydrothermals entering the caldera to form uranium deposit. In addition, it is clarified that the NE-NW rhombic-formed basement structural pattern is predominated by the NE-trending fault. At the same time, the important role of the basement faults in controlling the magmatic activities, in the formation of volcanic basins, as well as the formation of uranium mineralization is emphasized. On the basis of the above comprehensive analysis the authors suggest that the Tianmujian caldera is a quite favourable potential area for possessing the basic conditions necessary for the formation of rich and large uranium deposit including uranium 'source, migration, concentration, preservation' and favourable multiple metallogenic information is displayed in the Tianmujian area

  14. Radioactive mineral spring precipitates, their analytical and statistical data and the uranium connection

    Science.gov (United States)

    Cadigan, R.A.; Felmlee, J.K.

    1982-01-01

    Major radioactive mineral springs are probably related to deep zones of active metamorphism in areas of orogenic tectonism. The most common precipitate is travertine, a chemically precipitated rock composed chiefly of calcium carbonate, but also containing other minerals. The mineral springs are surface manifestations of hydrothermal conduit systems which extend downward many kilometers to hot source rocks. Conduits are kept open by fluid pressure exerted by carbon dioxide-charged waters rising to the surface propelled by heat and gas (CO2 and steam) pressure. On reaching the surface, the dissolved carbon dioxide is released from solution, and calcium carbonate is precipitated. Springs also contain sulfur species (for example, H2S and HS-), and radon, helium and methane as entrained or dissolved gases. The HS- ion can react to form hydrogen sulfide gas, sulfate salts, and native sulfur. Chemical salts and native sulfur precipitate at the surface. The sulfur may partly oxidize to produce detectable sulfur dioxide gas. Radioactivity is due to the presence of radium-226, radon-222, radium-228, and radon-220, and other daughter products of uranium-238 and thorium-232. Uranium and thorium are not present in economically significant amounts in most radioactive spring precipitates. Most radium is coprecipitated at the surface with barite. Barite (barium sulfate) forms in the barium-containing spring water as a product of the oxidation of sulfur species to sulfate ions. The relatively insoluble barium sulfate precipitates and removes much of the radium from solution. Radium coprecipitates to a lesser extent with manganese-barium- and iron-oxy hydroxides. R-mode factor analysis of abundances of elements suggests that 65 percent of the variance of the different elements is affected by seven factors interpreted as follows: (1) Silica and silicate contamination and precipitation; (2) Carbonate travertine precipitation; (3) Radium coprecipitation; (4) Evaporite precipitation

  15. Detection and evaluation of uranium in different minerals by gamma spectrometry and laser induced breakdown spectroscopy

    International Nuclear Information System (INIS)

    Sergani, F.M.; Khedr, M.A.; Harith, M.A.; El Mongy, S.A.

    2004-01-01

    Analysis, detection and evaluation of source nuclear materials (e.g. uranium) in different minerals by sensitive techniques are a vital objective for uranium exploration, nuclear materials extraction, processing and verification. In this work, uranium in different geological formations was determined using gamma spectrometry and laser induced breakdown spectroscopy (LIBS). The investigated samples were collected from different regions distributed all over Egypt. The samples were then prepared for non-destructive analysis. A hyper pure germanium detector was used to measure the emitted gamma rays of uranium and its daughters in the samples. The concentrations of uranium in ppm (μg/g) in the investigated samples are given and discussed in this work. The highest uranium concentration (4354.9 ppm) was found in uranophane samples of Gattar rocks. In Laser induced breakdown spectroscopy (LIBS) technique, plasma was formed by irradiating the rock surface with focused Q-switched Nd:Yag laser pulses of 7 ns pulse duration at the fundamental wavelength (1064 nm). Atoms and ions originating from the rock surface are excited and ionized in the laser produced hot plasma (∝10 000 K). The plasma emission spectral line is characteristic of the elements present in the plasma and allows identification of the uranium in the uranophane mineral. The strong atomic line at 424.2 nm is used for the qualitative identification of uranium. It can be mentioned that the elevated levels of uranium in some of the investigated uranophane samples are of great economic feasibility to be extracted. (orig.)

  16. Research on metallogenic conditions of intersection-type uranium ore-deposits in Zhongdong area, Northern Guangdong province

    International Nuclear Information System (INIS)

    Wang Zhengqi; Wu Lieqin; Zhang Guoyu

    2007-12-01

    The methods following as field geological investigation, trace element geo- chemistry and isotope geochemistry were used in this project. Based on geological and geochemical characteristics of Xiaoshui uranium ore deposits in Zhongdong area, Xiazhuang ore-field, Guangdong province, it could be concluded that: (1) The Provenance of Cretaceous mantle is a enriched mantle; (2) Silicified zone-type and intersection-type uranium ore are distinctness in the metallogenic period and mineralization process, and main metallogenic period of Xiaoshui uranium ore-deposit is 73.5 Ma; (3) The sources of uranium mineralization substance derived from enriched mantle; and (4)The intersection-type high grade uranium deposits were controlled by substances derived from mantle (contain with U, CO 2 , F, et al), tracks of intersection of NWW-across with NNE-trending faults and lithology of diabase. (authors)

  17. Research on metallogenic conditions of intersection-type uranium ore-deposits in Zhongdong area, Northern Guangdong province

    Energy Technology Data Exchange (ETDEWEB)

    Zhengqi, Wang [East China Inst. of Technology, Fuzhou (China); [Beijing Research Inst. of Uranium Geology, Beijing (China); Lieqin, Wu [Institute No.290, CNNC, Shaoguan (China); Guoyu, Zhang [East China Inst. of Technology, Fuzhou (China)

    2007-12-15

    The methods following as field geological investigation, trace element geo- chemistry and isotope geochemistry were used in this project. Based on geological and geochemical characteristics of Xiaoshui uranium ore deposits in Zhongdong area, Xiazhuang ore-field, Guangdong province, it could be concluded that: (1) The Provenance of Cretaceous mantle is a enriched mantle; (2) Silicified zone-type and intersection-type uranium ore are distinctness in the metallogenic period and mineralization process, and main metallogenic period of Xiaoshui uranium ore-deposit is 73.5 Ma; (3) The sources of uranium mineralization substance derived from enriched mantle; and (4)The intersection-type high grade uranium deposits were controlled by substances derived from mantle (contain with U, CO{sub 2}, F, et al), tracks of intersection of NWW-across with NNE-trending faults and lithology of diabase. (authors)

  18. Determination of favourable areas for uranium prospecting in Bolivia

    International Nuclear Information System (INIS)

    Pardo, E.

    1981-01-01

    The most prominent geological, lithological, stratigraphic, orogenic, metallogenetic, palaeogeographic and geochemical features favourable for the concentration of uranium deposits in Bolivia are described. This is a generalized study of the features mentioned above and should provide guidelines for eventual better understanding of the geology of Bolivia in general and that of uranium in particular. The purpose here is to demonstrate rational planning, which should be followed by the determination of favourable areas for uranium exploration, by the Bolivian Nuclear Energy Commission/Comision Boliviana de Energia Nuclear (COBOEN), and to provide basic information for the drawing up of contracts with foreign and/or national organizations interested in investing in uranium exploration. (author)

  19. Studies of Grants, New Mexico, uranium miners: status as of December, 1982

    International Nuclear Information System (INIS)

    Samet, J.M.; Morgan, M.V.; Buechley, R.W.; Key, C.R.; Valdivia, A.A.

    1983-01-01

    The report summarizes the current status of the Uranium Epidemiology Study at the University of New Mexico which was initiated in 1977 with the objective of examining mortality among uranium miners in the Grants mineral belt. Adequate historical information has been obtained on exposure for most subjects, and the dose range complements levels in the literature on health effects of radon daughters. Two separate cohorts are being developed to capitalize on this research opportunity. A prevalence survey of respiratory abnormalities has been completed. Future activities for the cohort of earlier miners will include estimation of exposures, completion of follow-up, and an analysis of lung cancer mortality in relation to WLM

  20. Mineral resource potential map of the Sugarloaf Roadless Area, San Bernardino County, California

    Science.gov (United States)

    Powell, Robert E.; Matti, Jonathan C.; Cox, Brett F.; Oliver, Howard W.; Wagini, Alexander; Campbell, Harry W.

    1983-01-01

    Geologic, geochemical, and geophysical investigations and a survey of mines and prospects indicate that the Sugaloaf Roadless Area contains subeconomic graphite and magnesian marble resources. Parts of the area have a low potential for the occurrence of additional low-grade graphite resources, but there is no potential for additional magnesian marble resources within the roadless area. Sand, gravel, and construction stone other than carbonate rocks are found in the roadless area, but similar or better quality materials are abundant and more accessible outside the area. The roadless area has no identified energy mineral resources, but parts of the area have a low to moderate potential for low-grade uranium resources. There are no identified metallic mineral resources within the area, and there is no evidence of a potential for the occurrence of such resources. No previously unknown mineral occurrence was located during this study.

  1. Study of phosphatic nodules as a possible source of uranium mineralization in warcha sandstone of nilawahan group salt range using SSNTD technique

    International Nuclear Information System (INIS)

    Qureshi, A.A.; Ullah, K.; Ullah, N.; Mohammad, A.

    2004-07-01

    The strong in the sedimentary depositional characteristics between the Warcha Sandstone of Nilawahan Group in the Salt Range and the uranium bearing sandstones of Siwalik Group in the foot hills of Himalaya and Sulaiman Ranges tempted the geologists to investigate the former group for the occurrence of any uranium deposits in it. Like volcanic ash beds in Siwaliks, phosphatic nodules may be a possible source of uranium mineralization in Warcha Sandstone of Nilawahan Group. Samples of phosphatic nodules occurring in the Sandstone of Nilawahan Group Salt Range were analyzed using Solid State Nuclear Track Detention Technique (SSNTD) for the determination of their uranium concentration. The results obtained are quite encouraging and favour the idea of exploring the area in detail for any possible occurrence of uranium deposit. Uranium concentration in these samples ranges from (434 + - 39) ppm to (964+ -81)ppm with and average concentration of (699 + - 62) ppm. (author)

  2. Recuperation of uranium and gold in mineral pulps by adsorption

    International Nuclear Information System (INIS)

    Bruno, J.B.; Amorim, L.O.

    1985-06-01

    The technological routes for the treatment of the gold and uranium ores are presented. The results obtained during the continuous tests with the uraniferous Ores of Wabo in Somalia are presented. The utilization of 99% of the uranium content in the alkaline pulp is obtained. (C.B.) [pt

  3. Uranium miners poised for big leap in competitive market

    International Nuclear Information System (INIS)

    Kemeny, L.

    1983-01-01

    Low cost uranium producers in Australia, Canada and South Africa expect to secure long term contracts over the next three to five decades as the recession in world industrial growth and stagnation of the American nuclear industry end. The demand for uranium from 1985 onwards will accelerate and by 1990 should surpass production

  4. Fluid inclusions in minerals associated to uranium mineralization in Jazida do Engenho (anomaly 09), Lagoa Real uranium province - Bahia, Brazil; Inclusoes fluidas nos minerais associados a mineralizacao uranifera da Jazida do Engenho (Anomalia 09), provincia uranifera de Lagoa Real, BA

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Aurelio da Silva de

    2009-07-01

    The Engenho deposit (anomaly 09) is south-eastern from Cachoeira Mine (anomaly 13), in the northern part of the Province. The uranium mineralization is associated to 'albitites' (over 70% of albite/oligoclase). Epidosites with uranium may also occur. The 'albitite' main minerals are pyroxene, gamet, albite/oligoclase feldspar, amphibole and biotite. Pyroxene, gamet, plagioclase, titanite and epidote are the minerals associated to the uranium mineralization. The fluids related to pyroxene, gamet and epidote are aqueous-saline, primary and with no carbonic phases and are constant, with small variations. They all present medium to high salinity (14 to 18wt% NaCl eq.), the higher values being related to pyroxene and the lower ones related to gamet and epidote. The fluids associated to albite/oligoclase, although aqua-saline and with no carbonic phases, show salinities much lower than in pyroxene, gamet and epidote, suggesting a intense dilution process indicating dilution toward the later minerals phases. The data suggest the pyroxene formation process occurring under a 3,5 kbar pressure condition which corresponds to approximately 10km depth. The dispersion on Th in albites, due probably to the overheating and non elastic increase in volume, precluded a reliable pressure calculation. The IF's microscopy m plagioclase gneiss (albitites host-rocks) suggests the probability of primary carbonic fluids associated to these minerals. The fluids with CO{sub 2} showed in the gneiss maybe also be present in the albitites, probably as late or intergranular fluids. This assumption is based on the fact that signs of carbonic gases were shown during crushing tests. These tendencies suggest the occurrence of two albitization phases in this Lagoa Real area: one associated to a fluid composed by H{sub 2}O + CO{sub 2} + salts (in the gneiss host) and another (in the albitite) formed by an aqueous-saline phase. The data indicate the Brasiliano event as a thermal

  5. Stream-sediment geochemical exploration for uranium in Narigan area Central Iran

    International Nuclear Information System (INIS)

    Yazdi, M.; Khoshnoodi, K.; Kavand, M.; Ashteyani, A. R.

    2009-01-01

    Uranium deposits of Iran occur mainly in the Central Iran zone. Several uranium deposits have been discovered in this zone. The Narigan area is one of the most important uranium mineralized area in this zone. The uranium bearing sequences in this area are contained in the plutonic to volcanic rocks of Narigan which intruded to the Pre-Cambrian pyroclastics rocks. Plutonic and volcanic rocks are granite, rhyolite and volcanoclastic. Diabasic dykes have been intruded to these igneous rocks. The plutonic and volcanic rocks have been covered by Cretaceous limestones which seem to be youngest the rocks in this area. The aim of our project is to develop a regional exploration strategy for uranium in these igneous rocks. A grid-based sampling was planned following the results of the previous geochemical mapping at a scale of 1:100,000, integrated with geophysical data and alteration zones and outcrop of intrusive rocks. The following results are based on geological, and stream geochemical explorations in 1:20000 scale of this area. During this study 121 samples were collected from the stream sediments of <80 mesh for final sampling. Ten percent of the samples were used for checking laboratories errors. The samples were collected according to conventional methods from 30-40 cm depth of stream sediments. Finally, geochemical and radiometric data were combined and the results introduced 3 anomalies in the Narigan area

  6. Lung cancer from radon and smoking: a multistage model for the WISMUT uranium miners

    International Nuclear Information System (INIS)

    Dillen, Teun van; Bijwaard, Harmen; Schnelzer, Maria; Kreuzer, Michaela; Grosche, Bernd

    2008-01-01

    Full text: In the world's third-largest uranium-mining province located in areas of Saxony and Thuringia in the former German Democratic Republic, the WISMUT Company conducted extensive uranium mining starting in 1946. Up to 1990, when mining activities were discontinued, most of the 400,000 employees had been exposed to uranium ore dust and radon and its progeny. It is well established that, besides smoking, such exposures are associated with an increased risk of lung cancer. From about 130,000 known miners a huge cohort of 59,000 miners has been formed and in an epidemiological analysis lung cancer risks have been evaluated (Grosche et al., 2006). We will present an alternative approach using a biologically-based multistage carcinogenesis model quantifying the lung-cancer risk related to both the exposure to radon and smoking habits. This mechanistic technique allows for extrapolation to the low exposures that are important for present-day radiation protection purposes and the transfer of risk across populations. The model is applied to a sub-cohort of about 35,000 persons who were employed at WISMUT after 1955, with known annual exposures estimated from the job-exposure matrix (Lehmann et al., 2004). Unfortunately, detailed information on smoking is missing for most miners. However, this information has been retrieved in two case-control studies, one of which was nested in the cohort while the other was not (Brueske-Hohlfeld et al., 2006). For these studies, the relevant smoking parameters are assembled in so-called smoking spectra that are next projected onto the entire cohort using a Monte-Carlo sampling method. Individual smoking habits that are randomly assigned to the cohort members, together with the information on annual exposure to radon, is used as an input for the multistage model. Model parameters related to radon and tobacco exposure are fitted with a maximum-likelihood technique. We will show results of the observed and expected lung

  7. Uranium deposits in the Beaverlodge area, northern Saskatchewan: their relationship to the Martin Group (Proterozoic) and the underlying basement

    International Nuclear Information System (INIS)

    Mazimhaka, P.K.; Hendry, H.E.

    1989-01-01

    The rocks of the Martin Group crop out in an area 60 km by 50 km north of Lake Athabasca near Uranium City, northern Saskatchewan. This area has numerous uranium showings within a few kilometres of the unconformity below the Martin Group. Mineralization occurs in fault zones, in basement rocks and in sedimentary and volcanic rocks of the Martin Group. Martin Group sediments accumulated in alluvial fans, braided streams, and ephemeral lakes. The thickest sequence (8 km to 10 km) is preserved in the Beaverlodge area, near Uranium City. The style of sedimentation changed through time as the basin evolved from deposition of conglomeratic detritus along fault scarps to the accumulation of silt in ephemeral lakes. The uneven nature of the sub-Martin unconformity surface, the lithotype of the lowermost conglomerates and breccias (Beaverlodge Formation), and the shape of the basin fill indicate deposition in fault-controlled basins. The earliest economic uranium mineralization in the rocks of the Martin Group was epigenetic. The mineralization was coeval with that in basement rocks. Economic mineralization in basement rocks and in the lowermost formation of the Martin Group is close to the unconformity. Epigenetic uranium mineralization thus appears to have resulted from processes that were related, in time and space, to either the formation of the unconformity or the deposition of the Martin Group or both. (author). 29 refs, 5 figs

  8. Preliminary study of the favorability for uranium in selected areas in the Basin and Range Province, Nevada

    International Nuclear Information System (INIS)

    Cupp, G.M.; Leedom, S.H.; Mitchell, T.P.; Kiloh, K.D.; Horton, R.C.

    1977-10-01

    Six uranium areas in Nevada were examined in a reconnaissance fashion to determine their favorability for uranium deposits. The favorable areas are: Virgin Valley, Humboldt County; northern Reese River Valley, Lander County; East Walker River, Lyon County; and Coaldale, Esmeralda County. Areas judged to be unfavorable are: Carol ''R'' prospect, Garfield Hills, Mineral County; and Meadow Valley (Panaca), Lincoln County. In the Virgin Valley area, the Canyon Rhyolite Formation contains as much as 27 ppM U 3 O 8 and is an excellent source rock. Uranium deposits in the underlying Virgin Valley Formation are small, but larger deposits may exist. The northern portion of the Reese River Valley contains several small uranium deposits but none of mineable grade or size. Rhyolitic volcanic rocks in the area contain above-average amounts of uranium, and larger deposits may lie beneath these potential source rocks. The East Walker River area may be part of a larger uranium province. Intrusive and extrusive rocks in the area contain above-average amounts of uranium, and low-grade supergene deposits were found. Large areas of potential source rocks and host rocks, and two small uranium deposits, were found in the Coaldale area. Many rhyolite plugs were also found. The Carol ''R'' prospect is an isolated uranium occurrence in Tertiary lacustrine rocks. Uranium deposits in Meadow Valley are in the Panaca Formation, a Pliocene lacustrine formation of varied lithology. The uranium deposits are small and low grade. It is unlikely that large-grade deposits will be found in this area

  9. PHASE ANALYSES OF URANIUM BEARING MINERALS FROM THE HIGH GRADE ORE, NOPAL I, PENA BLANCA, MEXICO

    International Nuclear Information System (INIS)

    Ren, M.; Goodell, P.; Kelts, A.; Anthony, E.Y.; Fayek, M.; Fan, C.; Beshears, C.

    2005-01-01

    The Nopal I uranium deposit is located in the Pena Blanca district, approximately 40 miles north of Chihuahua City, Mexico. The deposit was formed by hydrothermal processes within the fracture zone of welded silicic volcanic tuff. The ages of volcanic formations are between 35 to 44 m.y. and there was secondary silicification of most of the formations. After the formation of at least part of the uranium deposit, the ore body was uplifted above the water table and is presently exposed at the surface. Detailed petrographic characterization, electron microprobe backscatter electron (BSE) imagery, and selected x-ray maps for the samples from Nopal I high-grade ore document different uranium phases in the ore. There are at least two stages of uranium precipitation. A small amount of uraninite is encapsulated in silica. Hexavalent uranium may also have been a primary precipitant. The uranium phases were precipitated along cleavages of feldspars, and along fractures in the tuff. Energy dispersive spectrometer data and x-ray maps suggest that the major uranium phases are uranophane and weeksite. Substitutions of Ca and K occur in both phases, implying that conditions were variable during the mineralization/alteration process, and that compositions of the original minerals have a major influence on later stage alteration. Continued study is needed to fully characterize uranium behavior in these semi-arid to arid conditions

  10. Fracture-filling minerals as uranium sinks and sources, a natural analogue study at Palmottu, Finland

    International Nuclear Information System (INIS)

    Cui, D.; Eriksen, T.

    2000-01-01

    The nucleation of a mineral crystal and its growth in groundwater carrying fractures 300 m above the Palmottu uranium deposit provide an impressive example of geochemical selectivity of uranium. Fracture-filling material was collected from a 3 mm thick fracture at depth 74.8-75 m (drillcore R348). SEM and EDS analyses on a thin section of the original fracture-filling show that the fracture filling is heterogeneous, composing mineral crystal particles and very porous clay-rich aggregates. The results of INAA on millimetre-sized single mineral crystals and aggregates selected from grinded fracture-filling show that porous aggregates (composed of clays and micrometer sized mineral particles) contain up to 1000 ppm U, which is higher than the average of the whole fracture-filling (400 ppm) and host rock related millimetre sized mineral particles (18-100 ppm). 233 U/ 238 U isotope exchange proves that a large fraction of the uranium in the fracture-filling is not easily exchanged with uranium in the solution. The amount of 238 U released in the isotope exchange experiment is too high to be explained by reversible U(VI) sorption. Oxidation state analyses show that 30% of the uranium exists as U(IV). Laboratory batch experiment at anoxic conditions proved that pyrite can immobilise U(VI). (orig.)

  11. Wyoming uranium miners set sights on higher production

    International Nuclear Information System (INIS)

    White, L.

    1975-01-01

    The rising price of U 3 O 8 due to current shortage of supply and stiff environmental regulations on the uranium mining serve as grounds for caution in assessing the future of the uranium industry. Some projections of the need for doubled uranium production in the next 5 years have sparked much exploration and mining in Wyoming. Currently working or near-working mining operations are discussed briefly. The discussions are divided as to the company carrying out the operation-- from Exxon to small drilling contractors

  12. Lichens as biomonitors of uranium in the Balkan area

    Energy Technology Data Exchange (ETDEWEB)

    Loppi, S.; Riccobono, F.; Zhang, Z.H.; Savic, S.; Ivanov, D.; Pirintsos, S.A

    2003-09-01

    Widespread contamination by depleted uranium was not detected in the Balkan area. - The contribution of the conflict of 1999 to the environmental levels of uranium in the Balkan area was evaluated by means of lichens used as biomonitors. The average U concentration found in lichens in the present study was in line with the values reported for lichens from other countries and well below the levels found in lichens collected in areas with natural or anthropogenic sources of U. Measurement of isotopic ratios {sup 235}U/{sup 238}U allowed to exclude the presence of depleted uranium. According to these results, we could not detect widespread environmental contamination by depleted uranium in the Balkan area.

  13. Radioactive reconnaissance in area of utilization ammunition of depleted uranium

    International Nuclear Information System (INIS)

    Fortuna, D.; Dimitrijevic, D.

    2000-01-01

    In this paper are presented methods of radioactive reconnaissance and taking of samples in area of utilization ammunition of depleted uranium during the armed aggression of NATO to Yugoslavia (author)

  14. Geology of uranium in the Chadron area, Nebraska and South Dakota

    Science.gov (United States)

    Dunham, Robert Jacob

    1961-01-01

    The Chadron area covers 375 square miles about 25 miles southeast of the Black Hills. Recurrent mild tectonic activity and erosion on the Chadron arch, a compound anticlinal uplift of regional extent, exposed 1900 feet of Upper Cretaceous rocks, mostly marine shale containing pyrite and organic matter, and 600 feet of Oligocene and Miocene rocks, mostly terrestrial fine-grained sediment containing volcanic ash. Each Cretaceous formation truncated by the sub-Oligocene unconformity is stained yellow and red, leached, kaolinized, and otherwise altered to depths as great as 55 feet. The composition and profile of the altered material indicate lateritic soil; indirect evidence indicates Eocene(?) age. In a belt through the central part of the area, the Brule formation of Oligocene age is a sequence of bedded gypsum, clay, dolomite, and limestone more than 300 feet thick. Uranium in Cretaceous shale in 58 samples averages 0.002 percent, ten times the average for the earths crust. Association with pyrite and organic matter indicates low valency. The uranium probably is syngenetic or nearly so. Uranium in Eocene(?) soil in 43 samples averages 0.054 percent, ranging up to 1.12 percent. The upper part of the soil is depleted in uranium; enriched masses in the basal part of the soil consist of remnants of bedrock shale and are restricted to the highest reaches of the ancient oxidation-reduction interface. The uranium is probably in the from of a low-valent mineral, perhaps uraninite. Modern weathering of Cretaceous shale is capable of releasing as much as 0.780 ppm uranium to water. Eocene(?) weathering probably caused enrichment of the ancient soil through 1) leaching of Cretaceous shale, 2) downward migration of uranyl complex ions, and 3) reduction of hydrogen sulfide at the water table. Uranium minerals occur in the basal 25 feet of the gypsum facies of the Brule formation at the two localities where the gypsum is carbonaceous; 16 samples average 0.066 percent uranium and

  15. Study on the utilization of a sodium-sulfuric acid solution for the uranium minerals' leaching

    International Nuclear Information System (INIS)

    Echenique, Patricia; Fruchtenicht, Fernando; Gil, Daniel; Vigo, Daniel; Bouza, Angel; Vert, Gabriela; Becquart, Elena

    1988-01-01

    Argentine uranium minerals have been leached at bench scale with a different agent trying to reduce sulfuric acid consumption. The leaching agent was a sodium sulfate-sulfuric acid solution and the ore was from Sierra Pintada (San Rafael - Mendoza). The work was performed in stirred vessel at atmospheric pressure. The influence of different variables, pH, temperature, oxidant agent, sodium sulfate concentration and time, in the sulfuric acid consumption and the uranium yield was studied. (Author) [es

  16. Uranium mobility in mine areas: evaluation of the water-rock interaction

    Energy Technology Data Exchange (ETDEWEB)

    Zuddas, P. [UFR Sciences de la Terre. PEPS. Universite Claude Bernard. Lyon (France); Rocha Scislewski, A.; Faivre, D.; Lopez, O. [Institut de Physique du Globe de Paris (France)

    2005-07-01

    Full text of publication follows: Toxicity and natural radioactivity of uranium are among the main environmental concerns for exploitation and processing of uranium ore. Weathering processes and potential contamination paths of these areas have to be identified to preserve the water resources. In this work, leaching experiments were carried out in flow-through reactors. Approximately 750 g of crushed rock of selected grain size between 0.35 and 0.80 mm were introduced into a Pyrex column. Distilled and deionized water, saturated with 5% CO{sub 2}/95% air mixture, was introduced through a glass inlet fitted at the base of the column. Input solution pH was constantly equal to 4.2 while the low flow rate was obtained from a peristaltic pump. The output solution was sampled periodically for about 1 year. Three different rock samples were used: an untreated granite rock with high levels of uranium minerals, a rock with low uranium content and a rock rejected after the lixiviation process for uranium industrial extraction. For untreated rocks pH and silica decrease by 1-2 orders of magnitude while sodium decreases by 2-3 orders of magnitude. This indicates the strong albitite dissolution. Total dissolved uranium has a rather constant level indicating the constant dissolution rate of the uranium mineral assemblage. Thermodynamic modelling of the interacting output solutions indicates that 80% of the dissolved uranium content is under the form of two main carbonate complexes (i.e. UO{sub 2}(CO{sub 3}){sub 2}{sup 2-} and UO{sub 2}(CO{sub 3}){sub 3}{sup 4-}), while solutions are saturated on chalcedony, kaolinite and calcium clay minerals. Solutions are under saturated with respect to uraninite and low-temperature albite. In experiments where material was treated with sulphuric acid in the plant, pH is constantly equal to 4 indicating the lack of rock buffering properties. Na, Ca, and SO{sub 4} decrease by several orders of magnitude (from some initial mmol/kg) reaching

  17. Geological, radiometrical, and geochemical studies of Banggai granites and Bobong formation to determine potential Uranium area in Taliabu Island, North Maluku

    International Nuclear Information System (INIS)

    Ngadenin

    2016-01-01

    Geological, radiometrical, and geochemical studies of Banggai granites and Bobong Formation have been conducted in order to obtain potential uranium area. Taliabu Island is selected for the study because Taliabu Island is a micro continent fraction of the Gondwana super continent that separated at the end of the Mesozoic to Paleogene period. Some types of uranium mineralization formed in the period of Gondwana include sandstone-type, lignite coal type, and vein-type. Taliabu Island is a small part from the Gondwana super continent so it is expected will be found uranium mineralization or at least indications of uranium mineralization occurrences. The aim of this study is to obtain uranium potential areas for the development of uranium exploration in the future. The methods used are reviewing geological, radiometric, and geochemical data from various sources. The results of review showed that geological setting, radiometric, and geochemical data gives positive indication to the formation of uranium mineralization for sandstone type. Banggai granite is a potential uranium source. Sandstone of Bobong Formation as a potential host rock. Coal and pyrite as a potential precipitant. Uranium potential area is located on Bobong Formation and its surrounding. (author)

  18. Annotated bibliography of environmentally relevant investigations of uranium mining and milling in the Grants Mineral Belt, northwestern New Mexico

    Science.gov (United States)

    Otton, James K.

    2011-01-01

    Studies of the natural environment in the Grants Mineral Belt in northwestern New Mexico have been conducted since the 1930s; however, few such investigations predate uranium mining and milling operations, which began in the early 1950s. This report provides an annotated bibliography of reports that describe the hydrology and geochemistry of groundwaters and surface waters and the geochemistry of soils and sediments in the Grants Mineral Belt and contiguous areas. The reports referenced and discussed provide a large volume of information about the environmental conditions in the area after mining started. Data presented in many of these studies, if evaluated carefully, may provide much basic information about the baseline conditions that existed over large parts of the Grants Mineral Belt prior to mining. Other data may provide information that can direct new work in efforts to discriminate between baseline conditions and the effects of the mining and milling on the natural environment.

  19. Application of Solvent-In-Pulp Technique for Uranium Extraction from Mineralization Granite

    International Nuclear Information System (INIS)

    Ali, M.M.; Hussein, A.E.M.; Youseif, W.M.; El Didamony, A.M.

    2017-01-01

    Investigations on uranium extraction from a representative mineralized granite sample (Gattar granite GII) by solvent-in-pulp (SIP) technique were carried out in the present study. For this purpose, the solvent (tri-butyl amine) (TBA) was mixed with the leaching slurry without prior filtration. The influence of various factors affecting the SIP process, such as contact time, solvent concentration, dilution factor, type of surfactant, surfactant/solid ratio were studied. About 91% uranium extraction efficiency was attained by the application of the chosen extraction SIP conditions. Also, about 96% of the loaded uranium could be stripped by using sulfuric acid as an effective stripping agent

  20. Some physio-graphical keys to interpret reservoirs-traps, hosts of uranium-bearing mineralizations

    International Nuclear Information System (INIS)

    Parize, O.; Feybesse, J.L.; Wattinne-Morice, A.; Benedicto, A.; Richard, Y.; Sol, R.; Milesi, J.P.; Duchemin, Ch.; James, O.; Girard, Ch.

    2009-01-01

    As an approach in the search for silici-clastic formations which are reservoirs-traps hosting uranium-bearing mineralizations, the authors describe the use of facies sedimentology to describe successive deposits the arrangement of which determines the sequences according to which mineralisation will preferentially concentrate. They describe the use of sequential stratigraphy and how uranium had moved and deposited in successive eras and formations. They illustrate this approach by discussing different uranium-bearing deposits located in Niger and in France. They show how diagenesis, tectonics and sedimentology are combined to analyse these sites, and even to reassess them while exploiting them

  1. Lead determination in uranium mineralization soils by atomic absorption spectrometry with graphite oven

    International Nuclear Information System (INIS)

    Teixeira, Gleber Tacio

    2001-01-01

    The contamination of soils by lead has a great environmental importance due to its toxicity to vegetables, animals and humans. In general, the mobility of the lead is small due to its low solubility and strong adsorption in the soil. However, its solubility can be altered by several conditions (pH, redox potential and ionic stronger). Consequently, lead can migrate through the soil and can contaminate superficial and underground waters. The objective of this work was to determine the concentration of total lead in soil samples with uranium mineralization, in an area at Ipora/GO, having been evaluated as economically insuitable the extraction of that mineral. The radiogenic lead appears as a product of natural radioactive elements decay. In the decay series of uranium-238 we found the isotope lead-214 (half-life of 26,8 min), lead-210 (half-life of 22,3 min), and lead-206 that is stable. The sampling was done in profiles around north, south, east and west directions, starting from a reference point (FT), chosen by presenting the largest radiation of that place (4800 cps). A mass of 1 Kg of superficial soil was collected to each 20 m, in each profile, until 150 m of FT. Approximately, 1 g of dry soil, fraction 2 mm, was digested with a mixture of acids HNO 3 /HClO 4 2:1 (v/v), and the resulting solution was analyzed by atomic absorption. An atomic absorption spectrometer was used with graphite furnace, with deuterium arc to background correction and pyrolytic coated tube. Phosphoric acid was used as chemical modifier. The obtained results, using the standard additions method, presented a decrease of the lead concentration, in all profiles, when the distance of FT was increased. It was also made a radiometric screening in each sampling point. The lead concentration variate from 115,1 μg.g -1 in FT, to less than 40 μg.g -1 at 150 m of distance of FT ( 3 ) 2 was used. The method was applied to a certified sample, showing a good agreement between certified and

  2. A cohort study of lung cancer mortality of uranium miners in southern Bulgaria (town of Bansko)

    International Nuclear Information System (INIS)

    Apostolova, D.

    1997-01-01

    This study examines the mortality among uranium workers, residents of the town of Bansko, located in Southern Bulgaria. Case-control and historical cohort studies were initiated in 1985 among workers of the uranium mines and residents of the town of Bansko, located adjacent to mine operations, in order to estimate the patterns of risk more precisely. The investigation period continued till 1996. A preliminary case-control study of 17 lung cancer mortality cases of uranium miners between 48 and 70 years (average age 57,2) and age-matched controls were carried out among a group of 152 workers of under- and overground mines, residents of Bansko, exposed to Rn-222 and its decay products. Radon exposure was also estimated in working level months, based on the work histories and available radiation hygiene data. The average exposure for uranium miners was 1250 WLM. The examination carried out among uranium workers have clearly shown that the risk of lung cancer increases with the radon-222 and it's decay products exposure. The absolute risk of lung cancer among uranium workers was 1,1.10 -1 , and 7,7.10 -6 person-years. WLM -1 . Among 152 uranium workers 17 cases of lung cancer were observed (R1=0,11) against 0,0081 expected (R2) in the period 1985-1996. The observed to the expected cases ratio was 3,8 (OR=R1/R2). (author)

  3. Analysis on uranium mineralization-formation condition and prospecting potential in Xidamingshan metallogenic belt

    International Nuclear Information System (INIS)

    Li Zhixing; Qi Fucheng; He Zhongbo; Zhang Zilong

    2012-01-01

    There are many different opinions about the source of uranium and metallogenic mechanism in Xidamingshan metallogenic belt. therefore it blocked uranium resources potential evaluation and ore exploration. Through absorb in- formation and investigate Daxin deposit and systematic analysis on samples. It is believed that uranium source mainly came from Cambrian System, a little came from the deep. The Devonian System is favorable room for saving ores in addition to be pre-concentrated room for uranium. Also, there are new cognition about uranium metallogenic mechanism, establish ore-forming series of Xidamingshan metallogenic belt, It is proposed that uranium mineralization have experienced 4 stages; It is cleared that hydrothermal fluid superposition transform type uranium deposit is main genetic type, ancient karst accumulate type is secondary genetic type, the later is formed by leaching the former and then precipitate, enrichment in ancient karst congeries, which is formed nearby faults and with the movement of Xishan structural movement. It is proven that metallogenic potential of Xidamingshan metallogenic belt is good. Tectonic rock controlled by subsidiary fracture nearby regional main fault, which connected with the Cambrian System and the Devonian System, and the deep of the deposit is guideline of mineral prospecting next stage. (authors)

  4. Basinal analysis of the Ecca and Lowermost Beaufort Beds and associated coal, uranium and heavy mineral beach sand occurrences

    International Nuclear Information System (INIS)

    Ryan, P.J.; Whitfield, G.G.

    1979-01-01

    The regional sediment transport directions, major provenance areas and the controlling palaeotectonic and palaeogeographic frameworks of sedimentation have been reconstructed for the Great Karoo Basin during the Permian. Analyses of this magnitude can be useful in regional exploration programmes for coal, uranium and fossil heavy mineral beach sand deposits. The strong palaeogeographic control on coal deposition is demonstrated by the fact that some of the most important deposits accumulated in topographically low lying areas on the pre-Karoo surface. Such areas formed sheltered environments ideal for the growth and accumulation of organic material. Elsewhere relatively slow rates of subsidence of a broad, protected, low lying delta plain controlled the deposition of coal. North of the main Karoo Basin many of the coal deposits are confined to structurally controlled linear basins. Hundreds of sedimentary uranium occurrences of varying grade and size occur within a broad, discontinuous belt in the Lower Beaufort of the southwestern portion of the Karoo Basin. The uranium mineralization occurs in a variety of fluvial deposits usually rich in carbonaceous material. Minute tuffaceous fragments, reflecting contemporaneous vulcanism, form a minor but significant constituent in some of the uraniferous sandstones. The uranium occurrences are confined largely to the Southern and Western Facies of the Lower Beaufort, and occur mainly within the confines of the Karoo Trough. Consolidated heavy mineral beach deposits have been found in the predominantly fluvio-deltaic Middle Ecca Group of the Northern Facies at a number of widely separated locations. These deposits were formed by shore line processes, such as the reworking of delta-front sands, during periods of temporary marine regression

  5. Uranium miner lung cancer study. Progress report, March 15, 1974--March 15, 1975

    International Nuclear Information System (INIS)

    Saccomanno, G.

    1975-01-01

    The three projects supported by Atomic Energy Commission are of utmost importance and consist of: collection of material from uranium miners known to have cancer of the lung into a tumor registry; regression study of sputum cytological findings in uranium miners who showed marked atypical squamous cell metaplasia and have quit smoking cigarettes, mining, or both. This study was active for the last six years and some interesting information is being accumulated. Manual of Pulmonary Cytology. Approximately 60,000 sputum samples have been examined over the last 17 years in cases that showed normal cytology at the inception of study and subsequently developed carcinoma of the lung. (U.S.)

  6. Application of solution-mineral equilibrium chemistry to solution mining of uranium ores

    International Nuclear Information System (INIS)

    Riese, A.C.; Propp, C.J.

    1980-01-01

    Modern methods of uranium solution mining are typically accompanied by gains and losses of mass through reagent consumption by rock-forming minerals, with subsequent formation of clay minerals, gypsum, carbonates, and iron oxyhydroxides. A systematic approach to alleviate such problems involves the application of leach solutions that are in equilibrium with the host-rock minerals but in disequilibrium with the ore-forming minerals. This partial equilibrium can be approximated by solution-composition adjustments within the systems K 2 O-Al 2 O 3 SiO 2 -H 2 O and Na 2 O 3 -Al 2 O 3 SiO 2 -H 2 O. Uranium ore containing 0.15 percent U 3 O 8 from the Gulf Mineral Resources Corporation's Mariano Lake mine, the Smith Lake district of the Grants mineral belt, was collected for investigation. Presented are a theoretical evaluation of leachate data and an experimental treatment of the ore, which contained mainly K-feldspar, plagioclase feldspar, and quartz (with lesser amounts of micas, clay minerals, and organic carbonaceous material). Small-scale (less than or equal to 1 kg) column-leaching experiments were conducted to model the results of conventional leaching operations and to provide leachate solutions that could be compared with solutions calculated to be in equilibrium with the matrix minerals. Leach solutions employed include: 1) sulfuric acid, 2) sodium bicarbonate, and 3) sulfuric acid with 1.0 molal potassium chloride. The uranium concentrations in the sodium-bicarbonate leach solution and the acid-leach solution were about a gram per liter at the termination of the tests. However, the permeability of the ore in the acid leach was greatly reduced, owing to the formation of clay minerals. Uranium solubility in the leach column stabilized with the potassium-chloride solution was calculated from leachate compositions to be limited by the solubility of carnotite

  7. Identification of Uranium Minerals in Natural U-Bearing Rocks Using Infrared Reflectance Spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Beiswenger, Toya N. [Pacific Northwest National Laboratory, Richland, WA, USA; Gallagher, Neal B. [Eigenvector Research, Inc., Manson, WA, USA; Myers, Tanya L. [Pacific Northwest National Laboratory, Richland, WA, USA; Szecsody, James E. [Pacific Northwest National Laboratory, Richland, WA, USA; Tonkyn, Russell G. [Pacific Northwest National Laboratory, Richland, WA, USA; Su, Yin-Fong [Pacific Northwest National Laboratory, Richland, WA, USA; Sweet, Lucas E. [Pacific Northwest National Laboratory, Richland, WA, USA; Lewallen, Tricia A. [Pacific Northwest National Laboratory, Richland, WA, USA; Johnson, Timothy J. [Pacific Northwest National Laboratory, Richland, WA, USA

    2017-10-24

    The identification of minerals, including uranium-bearing minerals, is traditionally a labor-intensive-process using x-ray diffraction (XRD), fluorescence, or other solid-phase and wet chemical techniques. While handheld XRD and fluorescence instruments can aid in field identification, handheld infrared reflectance spectrometers can also be used in industrial or field environments, with rapid, non-destructive identification possible via spectral analysis of the solid’s reflectance spectrum. We have recently developed standard laboratory measurement methods for the infrared (IR) reflectance of solids and have investigated using these techniques for the identification of uranium-bearing minerals, using XRD methods for ground-truth. Due to the rich colors of such species, including distinctive spectroscopic signatures in the infrared, identification is facile and specific, both for samples that are pure or are partially composed of uranium (e.g. boltwoodite, schoepite, tyuyamunite, carnotite, etc.) or non-uranium minerals. The method can be used to detect not only pure and partial minerals, but is quite sensitive to chemical change such as hydration (e.g. schoepite). We have further applied statistical methods, in particular classical least squares (CLS) and multivariate curve resolution (MCR) for discrimination of such uranium minerals and two uranium pure chemicals (U3O8 and UO2) against common background materials (e.g. silica sand, asphalt, calcite, K-feldspar) with good success. Each mineral contains unique infrared spectral features; some of the IR features are similar or common to entire classes of minerals, typically arising from similar chemical moieties or functional groups in the minerals: phosphates, sulfates, carbonates, etc. These characteristic 2 infrared bands generate the unique (or class-specific) bands that distinguish the mineral from the interferents or backgrounds. We have observed several cases where the chemical moieties that provide the

  8. French uranium mines and miners from 1945 to 1975

    International Nuclear Information System (INIS)

    Blanc, J.

    2009-04-01

    The author proposes an historical review of the French uranium mining activity, and more particularly of its actors from 1945 to 1975 with the creation of the CEA and of its different departments, and their successive managers. CEA teams explored several countries but also exploit uranium ores in France (275 tons in 1956). After a continuous development until 1962, an important discovery in Niger, the activity in France faced great difficulties between 1970 and 1973, just before knowing great time due to the French electronuclear program (1974-1980), and to the strong increase of the uranium market. The first oil crisis was still a benefit, but the third oil crisis (1980) caused a reduction of power plant commissioning

  9. Lung cancer in uranium miners: A tissue resource and pilot study. Final performance report

    Energy Technology Data Exchange (ETDEWEB)

    Samet, J.; Gilliland, F.D.

    1998-08-13

    This project incorporates two related research projects directed toward understanding respiratory carcinogenesis in radon-exposed former uranium miners. The first project involved a continuation of the tissue resource of lung cancer cases from former underground uranium miners and comparison cases from non-miners. The second project was a pilot study for a proposed longitudinal study of respiratory carcinogenesis in former uranium miners. The objectives including facilitating the investigation of molecular changes in radon exposed lung cancer cases, developing methods for prospectively studying clinical, cytologic, cytogenetic, and molecular changes in the multi-event process of respiratory carcinogenesis, and assessing the feasibility of recruiting former uranium miners into a longitudinal study that collected multiple biological specimens. A pilot study was conducted to determine whether blood collection, induced sputum, bronchial brushing, washings, and mucosal biopsies from participants at two of the hospitals could be included efficiently. A questionnaire was developed for the extended study and all protocols for specimen collection and tissue handling were completed. Resource utilization is in progress at ITRI and the methods have been developed to study molecular and cellular changes in exfoliated cells contained in sputum as well as susceptibility factors.

  10. Lung cancer in uranium miners: A tissue resource and pilot study. Final performance report

    International Nuclear Information System (INIS)

    Samet, J.; Gilliland, F.D.

    1998-01-01

    This project incorporates two related research projects directed toward understanding respiratory carcinogenesis in radon-exposed former uranium miners. The first project involved a continuation of the tissue resource of lung cancer cases from former underground uranium miners and comparison cases from non-miners. The second project was a pilot study for a proposed longitudinal study of respiratory carcinogenesis in former uranium miners. The objectives including facilitating the investigation of molecular changes in radon exposed lung cancer cases, developing methods for prospectively studying clinical, cytologic, cytogenetic, and molecular changes in the multi-event process of respiratory carcinogenesis, and assessing the feasibility of recruiting former uranium miners into a longitudinal study that collected multiple biological specimens. A pilot study was conducted to determine whether blood collection, induced sputum, bronchial brushing, washings, and mucosal biopsies from participants at two of the hospitals could be included efficiently. A questionnaire was developed for the extended study and all protocols for specimen collection and tissue handling were completed. Resource utilization is in progress at ITRI and the methods have been developed to study molecular and cellular changes in exfoliated cells contained in sputum as well as susceptibility factors

  11. Geochemical orientation survey of stream sediment, stream water, and ground water near uranium prospects, Monticello area, New York. National Uranium Resource Evaluation Program

    International Nuclear Information System (INIS)

    Rose, A.W.; Smith, A.T.; Wesolowski, D.

    1982-08-01

    A detailed geochemical test survey has been conducted in a 570 sq km area around six small copper-uranium prospects in sandstones of the Devonian Catskill Formation near Monticello in southern New York state. This report summarizes and interprets the data for about 500 stream sediment samples, 500 stream water samples, and 500 ground water samples, each analyzed for 40 to 50 elements. The groundwater samples furnish distinctive anomalies for uranium, helium, radon, and copper near the mineralized localities, but the samples must be segregated into aquifers in order to obtain continuous well-defined anomalies. Two zones of uranium-rich water (1 to 16 parts per billion) can be recognized on cross sections; the upper zone extends through the known occurrences. The anomalies in uranium and helium are strongest in the deeper parts of the aquifers and are diluted in samples from shallow wells. In stream water, copper and uranium are slightly anomalous, as in an ore factor derived from factor analysis. Ratios of copper, uranium, and zinc to conductivity improve the resolution of anomalies. In stream sediment, extractable uranium, copper, niobium, vanadium, and an ore factor furnish weak anomalies, and ratios of uranium and copper to zinc improve the definition of anomalies. The uranium/thorium ratio is not helpful. Published analyses of rock samples from the nearby stratigraphic section show distinct anomalies in the zone containing the copper-uranium occurrences. This report is being issued without the normal detailed technical and copy editing, to make the data available to the public before the end of the National Uranium Reconnaissance Evaluation program

  12. Geochemical orientation survey of stream sediment, stream water, and ground water near uranium prospects, Monticello area, New York. National Uranium Resource Evaluation Program

    Energy Technology Data Exchange (ETDEWEB)

    Rose, A. W.; Smith, A. T.; Wesolowski, D.

    1982-08-01

    A detailed geochemical test survey has been conducted in a 570 sq km area around six small copper-uranium prospects in sandstones of the Devonian Catskill Formation near Monticello in southern New York state. This report summarizes and interprets the data for about 500 stream sediment samples, 500 stream water samples, and 500 ground water samples, each analyzed for 40 to 50 elements. The groundwater samples furnish distinctive anomalies for uranium, helium, radon, and copper near the mineralized localities, but the samples must be segregated into aquifers in order to obtain continuous well-defined anomalies. Two zones of uranium-rich water (1 to 16 parts per billion) can be recognized on cross sections; the upper zone extends through the known occurrences. The anomalies in uranium and helium are strongest in the deeper parts of the aquifers and are diluted in samples from shallow wells. In stream water, copper and uranium are slightly anomalous, as in an ore factor derived from factor analysis. Ratios of copper, uranium, and zinc to conductivity improve the resolution of anomalies. In stream sediment, extractable uranium, copper, niobium, vanadium, and an ore factor furnish weak anomalies, and ratios of uranium and copper to zinc improve the definition of anomalies. The uranium/thorium ratio is not helpful. Published analyses of rock samples from the nearby stratigraphic section show distinct anomalies in the zone containing the copper-uranium occurrences. This report is being issued without the normal detailed technical and copy editing, to make the data available to the public before the end of the National Uranium Reconnaissance Evaluation program.

  13. A cohort study of uranium millers and miners of Grants, New Mexico, 1979-2005

    International Nuclear Information System (INIS)

    Boice, John D Jr; Cohen, Sarah S; Mumma, Michael T; Chadda, Bandana; Blot, William J

    2008-01-01

    A cohort mortality study of workers engaged in uranium milling and mining activities near Grants, New Mexico, during the period from 1955 to 1990 was conducted. Vital status was determined through 2005 and standardised mortality ratio (SMR) analyses were conducted for 2745 men and women alive after 1978 who were employed for at least six months. Overall, mortality from all causes (SMR 1.15; 95% CI 1.07-1.23; n = 818) and all cancers (SMR 1.22; 95% CI 1.07-1.38; n = 246) was greater than expected on the basis of US mortality rates. Increased mortality, however, was seen only among the 1735 underground uranium miners and was due to malignant (SMR 2.17; 95% CI 1.75-2.65; n = 95) and non-malignant (SMR 1.64; 95% CI 1.23-2.13; n = 55) respiratory diseases, cirrhosis of the liver (SMR 1.79; n = 18) and external causes (SMR 1.65; n = 58). The lung cancer excess likely is attributable to the historically high levels of radon in uranium mines of the Colorado Plateau, combined with the heavy use of tobacco products. No statistically significant elevation in any cause of death was seen among the 904 non-miners employed at the Grants uranium mill. Among 718 mill workers with the greatest potential for exposure to uranium ore, no statistically significant increase in any cause of death of a priori interest was seen, i.e., cancers of the lung, kidney, liver, or bone, lymphoma, non-malignant respiratory disease, renal disease or liver disease. Although the population studied was relatively small, the follow-up was long (up to 50 yrs) and complete. In contrast to miners exposed to radon and radon decay products, for uranium mill workers exposed to uranium dusts and mill products there was no clear evidence of uranium-related disease

  14. Mineral resource potential of the Piedra Wilderness Study Area, Archuleta and Hinsdale counties, Colorado

    Science.gov (United States)

    Bush, Alfred L.; Condon, Steven M.; Franczyk, Karen J.; Brown, S.Don

    1983-01-01

    The mineral resource potential of the Piedra Wilderness Study Area is low. No occurrences of metallic minerals, of valuable industrial rocks and minerals, or of useful concentrations of organic fuels are known in the study area. However, a noneconomic occurrence of gypsum in the Jurassic Wanakah Formation lies a few hundred feet west of the WSA boundary, is believed to extend into the WSA, and has a low resource potential. Particular attention was paid to the possible occurrence of organic fuels in the Pennsylvanian Hermosa Formation, of uranium and vanadium in the Jurassic Entrada Sandstone and Morrison Formation, and of coal in the Cretaceous Dakota Sandstone. Thin coaly beds in the Dakota have a low resource potential. Extensive sampling of stream sediments, limited sampling of rock outcrops and springs, and a number of scintillometer traverses failed to pinpoint significant anomalies that might be clues to mineral deposits.

  15. Brief analysis on uranium metallogenic potential in Wunikeng area

    International Nuclear Information System (INIS)

    Wang Binghua

    2010-01-01

    Through the geological mapping, gamma total equivalent weight survey in Wunikeng area, the tectonics and gamma anomalies discovered in this area are analyzed, uranium metallogenic potential is analyzed by combining the regional metallogenic condition, contrasting the metallogenic geological background, massif condition, tectonic framework from these aspects of the regional geological background, massif condition on the work area, tectonic framework, etc.. (authors)

  16. Concentration of gold, sulphide minerals, and uranium oxide minerals by flotation from ores and metallurgical plant products

    International Nuclear Information System (INIS)

    Weston, D.

    1976-01-01

    A process is described for the concentration by flotation of gold, gold bearing minerals and uranium oxide minerals from ores and metallurgical plant products. A pulp of a ground ore is agitation conditioned in at least two agitation conditioning stages wherein in at least one stage the pH of the pulp is lowered with an acid agent to within the pH range of about 1.5 to 5.0, and wherein in at least one additional agitation conditioning stage the pH of the pulp is raised to within the pH range of about 6.0 to 11.0 and wherein in at least the last stage prior to flotation at least one collector selected from the group of sulfhydryl anionic collectors is present. Subsequently, the at least two stage agitation conditioned pulp is subjected to flotation to produce a flotation concentrate enriched in at least one of the mineral values from the group consisting of gold, gold bearing minerals and uranium minerals

  17. The infrared stage Linkam FTIR 600 for microthermometric studies in dark and opaque minerals associated to uranium mineralization

    International Nuclear Information System (INIS)

    Lima, Tatiana Aparecida Fernandes de; Rios, Francisco Javier; Fuzikawa, Kazuo; Oliveira, Lucilia A. Ramos de; Oliveira, Elizabeth Kerpe; Neves, Jose Marques Correia; Prates, Sonia Pinto

    2009-01-01

    Fluid composition studies, throughout fluid inclusions (FI), contribute to improve the understanding of mineral deposits. FI correspond to small portions of fluids trapped in minerals by many processes that preserve relevant information related to fluid composition which forms ore deposits. Microscopy and microthermometry techniques applied to fluid inclusions studies of opaque and/or dark minerals use infrared light (IR). A specific stage heating/cooling that allows working in the near infrared (NIR). Thus, the infrared stage model FTIR600 Linkam coupled the IR OLYMPUS BX51, with the automatic controllers LNP 94/2 and TMS 94, and software Linksys 32 - Linkam installed in computer was implemented and tested. An infrared QUICAM fast 1394 QIMAGING TM camera with the program QCAPTURE SUITE was acquisition for images capture and adapted the new system. This infrared stage Linkam FTIR600 reach temperatures between -196 deg C to +600 deg C, with the differential of working in the NIR; it is all automated, obtaining computerized data, graphics in real time of analysis and storage the data. It also controls the speed of the experiment (up to 130 deg C/min); it runs consecutively heating and cooling with a small N 2 (l) consuming; besides greater results repeatability, obtaining accurate and precise temperatures. Actually the Linkam stage FTIR600 is operating in the Metallogenesis and Fluid Inclusions Laboratory (LIFM) at CDTN/CNEN. Uranium ore and/or others mineralization studies which shows dark or opaque mineral have been developed. The uranium mineralization in the Lagoa Real Uraniferous Province, Bahia, Brazil, shows several rock-forming minerals together with the dark and opaque minerals (garnet, magnetite, pyroxene) emphasized in the present work. (author)

  18. Okelobondo Uranium deposit: Regional context, stratigraphy, sedimentology, tectonic and mineralization

    International Nuclear Information System (INIS)

    Ango, A.M.

    1993-01-01

    This paper describes briefly the geology of Okelobondo uranium deposit (Gabon) and gives the study prospects of natural reactor phenomenon which depends of the operating progress state. Oklo phenomenon is considered as the best natural analogue for the study of radionuclide migration. 3 figs

  19. Regularities of the vertical distribution of uranium-molybdenum mineralization

    International Nuclear Information System (INIS)

    Konstantinov, V.M.; Kazantsev, V.V.; Protasov, V.N.

    1980-01-01

    The geological structure of one of ore fields of the uranium-molybdenum formation pertaining to the northern framing of a large volcano-tectonic depression is studied. The main uranium deposits are related to necks formed by neck facies of brown liparites. Three zones are singled out within the limits of the ore field. In the upper one there are small ore bodies with a low uranium content represented by phenolite-chlorite, pitchblende 3-coffinite 3-jordizite and calcinite-sulphide associations, in the middle one - the main ore bodies formed by pitchblende 1-chlorite, molybdenite 2 (jordizite)-pitchblende 2-hydromica, coffinite 2-pyrite associations; in the lower one-thin veinlets formed by coffinite-molybdenite 1-chlorite, brannerite-pyrite and pitchblende 1-chlorite associations. Dimensions of the ore deposits depend on the neck sizes: in small necks the middle zone and, rarely, the lower one are of the industrial interest; in the large ones - the upper middle and, probably, lower ones. The regularities found can be extended to other deposits of the uranium-molybdenum formation [ru

  20. Concentration factors of uranium mineralization in VII depositional cycle of Shuixigou group, lower-middle Jurassic at Wukurqi uranium deposit, Yili basin

    International Nuclear Information System (INIS)

    Liu Taoyong

    2004-01-01

    Starting with the analysis on uranium mineralization, this paper emphatically discusses factors related to uranium concentration in VII depositional cycle, such as the structure, the paleoclimate, the lithofacies-paleogeography, the lithology, the hydrogeology, the geochemistry, and the content of effective reductant. The author suggests that key factors of uranium migration and concentration at Wukurqi uranium deposit are the existence of ore-hosting formation (sand body), the long-term recharge of oxygen and uranium-bearing groundwater, the existence of effective reductant in ore-hosting formation

  1. Effects of hydrocarbon generation on fluid flow in the Ordos basin and relationship with uranium mineralization

    International Nuclear Information System (INIS)

    Xue Wei; Xue Chunji; Chi Guoxiang

    2012-01-01

    The Ordos Basin is not only an important uranium mineralization province but also a major producer of oil. gas and coal in China. The genetic relationship between uranium mineralization and hydrocarbons has been recognized by a number of previous studies, but it has not been well understood in terms of hydrodynamics of basin fluid flow. In a previous study we have demonstrated that the preferential localization of uranium mineralization in the upper part of the Jurassic strata may have been related to the interface of an upward flowing, reducing fluid and a downward flowing, oxidizing fluid, and that this interface may have been controlled by the interplay between fluid overpressure, which was related to disequilibrium sediment compaction and drove the upward flow, and topographic relief which drove the down- ward flow. In the present study, we carried out numerical modeling for the contribution of oil and gas generation to the development of fluid overpressure, in addition to sediment compaction and heating. Our results indicate that when hydrocarbon generation was taken into account, fluid overpressure during the Cretaceous was more than doubled in comparison with the simulation when hydrocarbon generation was not considered. Furthermore, fluid overpressure dissipation after ceasing of sedimentation slowed down relative to the no-hydrocarbon generation case. These results suggest that hydrocarbon generation may have played an important role in uranium mineralization, not only in providing reducing agents required for the mineralization, but also in contributing to the driving force to maintain the upward flow against the pushing of topography driven. downward flow, thus helping stabilize the interface between the two fluid system and localization of uranium mineralization. (authors)

  2. Uranium extraction from Uro area phosphate ore, Nuba mountains, Sudan

    International Nuclear Information System (INIS)

    Mohammed, A. A.; Eltayeb, M. A. H.

    2003-01-01

    This study was carried out mainly to extract uranium from Uro area phosphate ore in the eastern part of Nuba mountains near Abu Gibiha town in southern Kurdufan state. For this purpose first, the phosphate ore samples were decomposed with sulphuric acid. the resulting phosphoric acid was filtered off, and pretreated with pyrite and activated charcoal. the chemical analysis of the obtained grain phosphoric acid showed that about 98% of uranium content of the phosphate ore was rendered soluble in the phosphoric acid. The clear green phosphoric acid was introduced to uranium extraction by 25% tributylphosphate (Tbp) in kerosene. The effect of several factors on the extraction and stripping processes namely, interference's effect, the suitable strip solution, the required number of extraction and stripping stages, the optimum phase ratio have been studied in details. A three stage extraction at a phase ratio (aqueous/organic) of 1:2, followed by two stages stripping using 0.5 M sodium carbonate solution at a phase ratio (A/O) of 1:4 were found to be the optimum conditions to report more than 98% of uranium content in green phosphoric acid to the aqueous phase as uranyl tricarbonate complex (UO 2 (CO 3 ) 3 ) 4- . By applying sodica decomposition upon the stripping carbonate solution using 50% sodium hydroxide, about 98% of uranium content was precipitated as sodium diuranate concentrate (Na 2 U 2 O 7 ). The chemical analysis using atomic absorption spectrometry (Aas) showed a good agreement between the specification of the obtained uranium concentrate with the standard commercial specification of sodium diuranate concentrate. Further purification was achieved for the yellow cake by selective precipitation of uranium from the solution as uranium peroxide (UO 4 .2H 2 O) using 30% hydrogen peroxide. Finally the uranium peroxide precipitated was calcined at 450 degree C to obtain the orange powder uranium trioxide (UO 3 ). The chemical analysis of the final uranium trioxide

  3. Results of geochemical and mineralogical studies on uranium in Zechstein copper-bearing strata from Lubin-Polkowice area

    International Nuclear Information System (INIS)

    Bareja, E.

    1977-01-01

    The paper presents the results of geochemical and mineralogical studies on uranium in Zechstein copper-bearing strata from the Lubin-Polkowice area. It was found that particular lithofacial varietes of Zechstein copper-bearing strata are characterized by different concentration of uranium. The mineralogical studies made possible determination of the nature of uranium mineralization and the interdependence between uranium and lithology of copper-bearing strata. An interesting uranium mineralization was found in tectonic breccias which yield black blende and schroeckingerite as well as calcite, gypsum, pyrite, hematite and geothite. Secondary minerals such as schroeckingerite and geothite evidence intense weathering processes acting in the copper deposit. The highest value of geochemical background of uranium in the copper-bearing series is displayed by basel copper-bearing shales (so called pitch-black shales) - 68.10 x 10 -40 /0 U. Statistical distribution of that element is unimodal. Distribution of uranium is polymodal in basal sandstones of the copper-bearing series. The geochemical background of red-coloured sandstones (Rotliegendes) is low, equalling 0.39 x 10 40 /0 U, whilst that of gray-coloured sandstones (Zechstein) - 2.32 x 10 -40 /0 U. An anomallous population (344.0 x 10 -40 /0 U) found in the case of gray sandstones of the Lubin-Polkowice area evidences the effects of secondary processes on concentration of uranium. In sandstones occur black blende, carburanes as well as calcite, hematite and goethite. A bimodal distribution of uranium was found in carbonate series. Limestones are characterized by low value of geochemical background (Dsub(x1) = 0.78 x 10 -40 /0 U) whilst dolomites by markedly higher values of the background (Dsub(x2) = 2.73 x 10 -40 /0 U). (author)

  4. Uranium deposits in the Eureka Gulch area, Central City district, Gilpin County, Colorado

    Science.gov (United States)

    Sims, P.K.; Osterwald, F.W.; Tooker, E.W.

    1954-01-01

    The Eureka Gulch area of the Central City district, Gilpin County, Colo., was mined for ores of gold, silver, copper, lead, and zinc; but there has been little mining activity in the area since World War I. Between 1951 and 1953 nine radioactive mine dumps were discovered in the area by the U.S. Geological Survey and by prospectors. the importance of the discoveries has not been determined as all but one of the mines are inaccessible, but the distribution, quantity, and grade of the radioactive materials found on the mine dumps indicate that the area is worth of additional exploration as a possible source of uranium ore. The uranium ans other metals are in and near steeply dipping mesothermal veins of Laramide age intrusive rocks. Pitchblende is present in at least four veins, and metatorbernite, associated at places with kosolite, is found along two veins for a linear distance of about 700 feet. The pitchblends and metatorbernite appear to be mutually exclusive and seem to occur in different veins. Colloform grains of pitchblende were deposited in the vein essentially contemporaneously with pyrite. The pitchblende is earlier in the sequence of deposition than galena and sphalerite. The metatorbernite replaces altered biotite-quartz-plagioclase gneiss and altered amphibolite, and to a lesser extent forms coatings on fractures in these rocks adjacent to the veins; the kasolite fills vugs in highly altered material and in altered wall rocks. Much of the pitchblende found on the dumps has been partly leached subsequent to mining and is out of equilibrium. Selected samples of metatorbernite-bearing rock from one mine dump contain as much as 6.11 percent uranium. The pitchblende is a primary vein mineral deposited from uranium-bearing hydrothermal solutions. The metatorbernite probably formed by oxidation, solution, and transportation of uranium from primary pitchblende, but it may be a primary mineral deposited directly from fluids of different composition from these

  5. Uruguay minerals fuels[Study of Uranium geochemical prospection in Uruguay]; Los combustibles minerales del Uruguay

    Energy Technology Data Exchange (ETDEWEB)

    Goso, H

    1967-07-01

    In this report the bases for the development of the necessary works of prospection are exposed on mineral fuels of Uruguay. We have taken the set from: coal, lutitas bituminous, uranium, petroleum and disturbs. In all the cases we have talked about to the present state of the knowledge and to the works that we considered necessary to develop in each case.

  6. Geology and uranium mineralization in the eastern part of the Kani Basin, Gifu, Central Japan

    International Nuclear Information System (INIS)

    Kobayashi, Takao

    1989-01-01

    The Misano and Utozaka uranium deposits in the eastern part of the Kani Basin are within Miocene nonmarine sediments which unconformably overlie Paleozoic-Mesozoic sediments and Cretaceous-Paleogene granites. These deposits are classified as sandstone type deposits structurally controlled by palaeo-channel structures formed on the pre-Miocene basement rocks. The host rock is the Kani lignite-bearing formation which is the lowermost sequence of the Kani Group. The age of the formation was estimated to be 20-19 Ma by fission track dating. The mineralized host sediments consist of conglomerates, arkosic, tuffaceous and carbonaceous sandstones. Although no primary uranium mineral was identified to date, it is considered that uranium is present in uranous form. The mineralization was strongly controlled by a fault structure within the basement granites as well as the channel structure formed on the basement rocks, especially on the granites. The enriched ore zone of the Misano deposit distributes within the basal part of the Kani lignite-bearing formation above the basement fault structure and in the palaeo-channel downward from the fault structure. The basement granites were also mineralized along the fault structure. Groundwater leached uranium form the basement granites, and migrated along the fault structure to the host sediments to form the deposite. (Kako, I.)

  7. Geology and mineral technology of the grants uranium region 1979

    International Nuclear Information System (INIS)

    Rautman, C.A.

    1980-01-01

    Forty six papers which were presented at the 1979 Symposium on the Geology of the Grants Uranium Region plus three more are included in this Proceedings. The papers cover the geology of the Grants region with discussions of exploration history and methods, individual deposits, petrographic investigations, field studies mining and experimental studies. Other topics such as ground water hydrology and severence taxes are also included. All papers have been abstracted and all but four have been indexed

  8. Aspects of uranium mineralization in Figueira-PR, Brazil

    International Nuclear Information System (INIS)

    Saad, S.

    1974-01-01

    CNEN has been drilling in the Parana Basin since 1970. The data in the form of eletric, gama ray and stratigrafic logs and chemical analysis or core and cutting samples have been studied. These data show that the uranium deposition is in a paleochannel in the lower part of the Rio Bonito Formation and is due to an epigenetic process. The concentrations encountered indicate the possibility of an economic deposit

  9. Structural changes in amber due to uranium mineralization

    Czech Academy of Sciences Publication Activity Database

    Havelcová, M.; Machovič, V.; Mizera, Jiří; Sýkorová, I.; Rene, M.; Borecká, L.; Lapčák, L.; Bičáková, O.; Janeček, O.; Dvořák, Z.

    2016-01-01

    Roč. 158, JUL (2016), s. 89-101 ISSN 0265-931X R&D Projects: GA ČR(CZ) GBP108/12/G108; GA MŠk(CZ) LM2011019 Institutional support: RVO:61389005 Keywords : fossil resin * amber * Uranium * radiolytic alteration * micro-FTIR * mapping * SEM/EDX Subject RIV: CB - Analytical Chemistry, Separation Impact factor: 2.310, year: 2016

  10. Structural changes in amber due to uranium mineralization

    Czech Academy of Sciences Publication Activity Database

    Havelcová, Martina; Machovič, Vladimír; Mizera, Jiří; Sýkorová, Ivana; René, Miloš; Borecká, Lenka; Lapčák, L.; Bičáková, Olga; Janeček, O.; Dvořák, Z.

    158-159, JUL (2016), s. 89-101 ISSN 0265-931X R&D Projects: GA ČR(CZ) GA13-18482S Grant - others:OPPK(XE) CZ.2.16/3.1.00/21538 Program:OPPK Institutional support: RVO:67985891 Keywords : fossil resin * amber * uranium * radiolytic alteration * micro-FTIR * mapping * SEM/EDX Subject RIV: DD - Geochemistry Impact factor: 2.310, year: 2016

  11. Nuclear minerals prospect ion activity report Period 1985-1987-Uranium prospect ion in Uranium

    International Nuclear Information System (INIS)

    1988-01-01

    In framework of Mineral Inventory and Nuclear minerals program in the article has been carried out the following aims: strategic level, synthesis and results reached, evaluation conclusions and trends

  12. Concentration of gold, sulphide minerals and uranium oxide minerals by flotation from ores and metallurgical plant products

    International Nuclear Information System (INIS)

    Weston, D.

    1974-01-01

    A process for the recovery by froth flotation of gold and mineral values selected from the group consisting of gold bearing minerals, platinum group minerals, silver group minerals, and uranium group minerals, from ores and metallurgical plant products containing at least gold and at least one of the other said minerals comprising: subjecting a suitably prepared pulp of the material to mechanical agitation in at least one agitation conditioning stage wherein the pH of the said pulp has been lowered with an acid agent to an optimum pH point within the pH range of about 1.5 to 5.0 and wherein the agitation conditioning is for a sufficient period of time to bring about heavy activation of at least one of the said mineral values in at least one subsequent mechanical agitation conditioning stage wherein the said pulp is further agitation conditioned for a sufficient period of time and at an optimum pH point in the pH range of about 6.0 to 11.0 in the presence of at least one collector selected from the group of sulfhydryl anionic collectors to produce the said heavy activation of at least gold and at least one of the other said mineral values; and subsequently in the presence of a frother subjecting and said agitation conditioned pulp to flotation to produce a concentrate enriched in gold and at least one of the othersaid mineral values, and a tailings product impoverished in at least gold and at least one of the other said mineral values

  13. Discussion on geochemical characteristics, mechanism and prospecting model of gluey type sandstone uranium mineralization--taking Redwell uranium deposit as an example

    International Nuclear Information System (INIS)

    Wang Jinping

    1998-01-01

    Redwell uranium deposit hosted in the red clastic rock formation, is a typical example of gluey type uranium mineralization, which has not been reported so far in China. Based on the study of geochemical characteristics of Redwell deposit, the author discusses the genetic mechanism of this type deposits, and proposes the prospecting model of 4 in 1 of red bed-fault-oil gas-uranium source

  14. Appraisal of selected epidemiologic issues from studies of lung cancer among uranium and hard rock miners

    International Nuclear Information System (INIS)

    Petersen, G.R.; Sever, L.E.

    1982-04-01

    An extensive body of published information about lung cancer among uranium miners was reviewed and diverse information, useful in identifying important issues but not in resolving them was found. Measuring exposure and response; thresholds of exposure; latency or the period from first mining experience to death; effort to predict excess risk of death, using a model; effects of smoking and radon daughter exposure on the histology of lung tumors; and the interplay of factors on the overall risk of death were all examined. The general concept of thresholds; that is, an exposure level below which risk does not increase was considered. The conclusion is that it should be possible to detect and estimate an epidemiologic threshold when the cohorts have been followed to the death of all members. Issues concerning latency in the studies of uranium miners published to date were examined. It is believed that the induction-latent period for lung cancer among uranium miners may be: as little as 10 to more than 40 years; dependent on age at which exposure begins; exposure rate; and ethnicity or smoking habits. Although suggested as factual, their existence is uncertain. An effect due to the exposure rate may exist although it has not been factual, their existence is uncertain. An effect due to the exposure rate may exist although it has not been confirmed. The median induction-latent period appears to be in excess of the 15 years frequently cited for US uranium miner. A distinct pattern of shorter induction-latent periods with increasing age at first mining exposure is reported. The evidence for and against an unusual histologic pattern of lung cancers among uranium miners was examined. The ratio of epidermoid to small cell types was close to 1:2; the ratio in the general population is nearer 2:1. The histologic pattern warrants closer attention of pathologists and epidemiologists. (ERB)

  15. Mineral Resources of the Morey and Fandango Wilderness Study Areas, Nye County, Nevada

    Science.gov (United States)

    John, David A.; Nash, J. Thomas; Plouff, Donald; McDonnell, John R.

    1987-01-01

    The Morey (NV-060-191) and Fandango (NV-060-190) Wilderness Study Areas are located in the northern Hot Creek Range about 25 mi north of Warm Springs, Nev. At the request of the Bureau of Land Management, 46,300 acres of the Morey and Fandango Wilderness Study Areas were studied. In this report, the area studied is referred to as 'the wilderness study area', or simply 'the study area'. Geologic, geochemical, geophysical, and mineral surveys were conducted by the USGS and the USBM in 1984 to appraise the identified mineral resources and to assess the mineral resource potential of the study areas. These studies indicate that there are small identified resources of zinc, lead, and silver at the Lead Pipe property in the Fandango Wilderness Study Area, several areas of high potential for the occurrence of gold resources in the Fandango study area, small areas of low and moderate potential for the occurrence of silver, lead, and zinc resources in the Fandango study area, areas of moderate and high potential for the occurrence of silver, lead, and zinc resources in the Morey study area, and an area of low potential for copper, molybdenum, and tin in the Morey study area. Both study areas have low resource potential for petroleum, natural gas, uranium, and geothermal energy.

  16. Uranium in minerals of gold-bearing formations of the North-Eastern part of the USSR

    International Nuclear Information System (INIS)

    Zagruzina, I.A.; Pinsky, E.M.

    1979-01-01

    Uranium concentration in 2190 mineral grains from 23 gold-bearing veins of different age deposits in the North-Eastern part of the USSR have been determined using f-radiography. The deposits studied are referred to two formation types: gold-silver epithermal and gold-quartz mesothermal. Differences in physico-chemical conditions of deposite formation of the above formation types are emphasized by the differences in uranium concentration in the vein minerals: 1.0-1.4 g/tU in the first type and 0.4 g/tU in the second one. Uranium content in minerals of gold-bearing veins as compared to minerals of other deposits is characterized by the lowest concentrations. In all gold-bearing veins hydrooxides of iron and hydromica are the main concentrators of uranium. Hypergene stage plays dominating role in uranium accumulation

  17. Preservation and concentration of uranium mineralization in the crust of weathering

    International Nuclear Information System (INIS)

    Ashikhmin, A.A.; Kuznetsov, S.V.; Shmarovich, E.M.

    1983-01-01

    Inprecision of the concept on indispensable evacuation of U from ores during formation of the crust of weathering of lateritic or kaolinitic profile due to the existence of oxidative situation in the crusts is established. At hydrothermal uranium deposit in Eocambrian sandy-shaly and Paleozoic volcanogenous-sedimentary rocks a high degree of mineralization preservation in lower and medium horizons of Mesozoic-Cenozoic hydro-micaceous-kaolinitic crust of weathering, characterized by reductive situation, presence of carbonaceous substance, pyrite and siderite, is established. Mineralization attained there black composition and was additionally enriched with uranium. A supposition is made that the case is specific for the development of lateritic and kaolinitic crust formation according to ore-bearing rocks, rich in reducing agents-carbonaceous substances, sulfides and minerals of protoxidic iron. The data obtained should be taken into account during prediction and prospecting activities

  18. Remote Sensing, Geology and Geochemistry on the GVIII Uranium Mineralization, Gabal Gattar, North Eastern Desert, Egypt

    International Nuclear Information System (INIS)

    Elkholy, D.M.; Elhusseiny, M.O.; Saleh, W.H.; Elzalaky, M.A.

    2012-01-01

    GVIII- uranium occurrence of Gabal Gattar is located at the intersection of Lat. 27° 05' 56 a nd Long. 33° 16' 33 t o the south of GH-uranium occurrence. This occurrence is hosted in the alkali feldspar granite of Gabal Gattar. It is dissected by NNE-SSW, ENE-WSW and NW-SE faults and fractures. The granite is strongly altered in the zones of these faults and fractures. This granite is composed of K-feldspars, quartz, plagioclase and biotite as essential minerals and zircon, apatite, fluorite as accessories. The secondary minerals are chlorite, sericite, muscovite and iron oxides. The main alterations along the fault and fracture zones are hematitization, silicification, kaolintiization, chloritization and fluoritization that increase at the zones of intersection.The Advanced Spacebome Thermal Emission and Reflection Radiometer (ASTER) discriminated and mapped the hematitized zones in the studied granitic rocks predicting iron oxides as pathfinder minerals that be helpful in localizing high uranium concentration. The compilated and integrated data as alteration zones, geological and structural features using Geographic Information System (GIS) played an important role in correlating, manipulating, visualizing and extracting the information getting a better result for interpretation and evaluation of this occurrence. The study granite is geochemically, alkali- feldspar granite to syenogranite originated from weakly peraluminous magma of alkaline affinity and of within plate tectonic setting due to crustal relaxation. This granite shows many geochemical characterestics similar to the A-type granite, high contents of SiO 2 , (Na 2 O + K 2 O), Rb, Nb, Y, low contents of MgO, CaO and Sr and apparently F-rich granite.Radiometric measurements of GVIII U-occurrence show that the study granite records uranium values between 15 and 28 ppm, while the anomalies record uranium values range from 400 to more than 30000 ppm. Surfacial yellow secondary uranium

  19. Sintering of uranium oxide of high specific surface area

    International Nuclear Information System (INIS)

    Bel, Alain; Francois, Bernard; Delmas, Roger; Caillat, Roger

    1959-01-01

    The extent to which a uranium oxide powder deriving from ammonium uranate or uranium peroxide lends itself to the sintering process depends largely on its specific surface area. When this is greater than 5 m 2 / g there is an optimum temperature for sintering in hydrogen. This temperature becomes less as the specific area of the powder is greater. Reprint of a paper published in Comptes rendus des seances de l'Academie des Sciences, t. 249, p. 1045-1047, sitting of 21 September 1959 [fr

  20. In vivo measurements of lead-210 for assessing cumulative radon exposure in uranium miners

    Energy Technology Data Exchange (ETDEWEB)

    Guilmette, R.A.; Laurer, G.R. [New York Univ. Inst. of Environmental Medicine, Tuxedo, NY (United States); Lambert, W.E.; Gilliland, F.D. [Univ. of New Mexico, Albuquerque, NM (United States)] [and others

    1995-12-01

    It has long been recognized that a major contributor to the uncertainty in risk analysis of lung cancer in uranium and other hard rock miners is the estimation of total radon progeny exposure of individual miners under study. These uncertainties arise from the fact that only a limited number of measurements of airborne {sup 222}Rn progeny concentrations were made in the mines during the times that the miners were being exposed, and that dosimeters capable of integrating the Rn progeny exposures of the miners did not exist. Historically, the cumulative exposures for individual uranium and other hard rock miners have been calculated by combining the employee`s work history, which may or may not have included time spent at different jobs within the mines and at different locations within the mines, with whatever periodic measurements of Rn and Rn progeny were available. The amount and quality of the measurement data varied enormously from mine to mine and from population to population. Because the quality of the exposure data collected during the period of active mining in the United STates cannot now be altered substantially, significant improvement in individual miner exposure estimates is only likely to be achieved if a new cumulative exposure metric is developed and implemented. The decay chain of Rn includes the production of {sup 210}Pb, which can accumulate in the skeleton in amounts proportional to the intake of Rn progeny. We hypothesize that the in vivo measurement of {sup 210}Pb in the skulls of miners will provide such a metric. In summary, the primary purpose of this pilot study to demonstrate the feasibility of measuring {sup 210}Pb in the heads of former uranium miners has been accomplished.

  1. In vivo measurements of lead-210 for assessing cumulative radon exposure in uranium miners

    International Nuclear Information System (INIS)

    Guilmette, R.A.; Laurer, G.R.; Lambert, W.E.; Gilliland, F.D.

    1995-01-01

    It has long been recognized that a major contributor to the uncertainty in risk analysis of lung cancer in uranium and other hard rock miners is the estimation of total radon progeny exposure of individual miners under study. These uncertainties arise from the fact that only a limited number of measurements of airborne 222 Rn progeny concentrations were made in the mines during the times that the miners were being exposed, and that dosimeters capable of integrating the Rn progeny exposures of the miners did not exist. Historically, the cumulative exposures for individual uranium and other hard rock miners have been calculated by combining the employee's work history, which may or may not have included time spent at different jobs within the mines and at different locations within the mines, with whatever periodic measurements of Rn and Rn progeny were available. The amount and quality of the measurement data varied enormously from mine to mine and from population to population. Because the quality of the exposure data collected during the period of active mining in the United STates cannot now be altered substantially, significant improvement in individual miner exposure estimates is only likely to be achieved if a new cumulative exposure metric is developed and implemented. The decay chain of Rn includes the production of 210 Pb, which can accumulate in the skeleton in amounts proportional to the intake of Rn progeny. We hypothesize that the in vivo measurement of 210 Pb in the skulls of miners will provide such a metric. In summary, the primary purpose of this pilot study to demonstrate the feasibility of measuring 210 Pb in the heads of former uranium miners has been accomplished

  2. The behavior of uranium in the soil/plant system with special consideration of the uranium input by mineral phosphorus fertilizer

    International Nuclear Information System (INIS)

    Setzer, Sascha

    2014-01-01

    The fate of uranium in the environment and, consequently, its hazard potential for human beings is still discussed controversially in the scientific literature. Mineral phosphorous fertilizer can contain uranium as impurity, so that their application can cause an additional input of uranium into agricultural environments. It is still unclear whether and to what extent fertilizer-derived uranium can enter the human food chain by the consumption of contaminated waters or vegetable crop products. The mobility and availability of uranium in the agricultural ecosystem is mainly determined by its behavior in the pedosphere. Due to interactions with organic and inorganic components, the pedosphere is an effective storage and filter system for pollutants and thus plays an important role for the fate of uranium in the environment. In order to improve the assessment of the hazard potential, the present study investigates the behavior of uranium in the soil/plant-system with a focus on the uranium input by mineral phosphorous fertilizer. The specific objectives were (A) to investigate the general distribution of uranium in soils, (B) to determine the effect of CaCO 3 on the sorption behavior of uranium and to quantify the effects of (C - D) varying substrate properties and (E) the application of phosphorus fertilizers on the uranium uptake by ryegrass. The results of these experiments imply that the use of mineral phosphorous fertilizers does not pose an acute risk within the meaning of consumer protection. The studied soils predominantly had a high to very high sorption capability for uranium. At the same time, a small soil-to-plant-transfer of uranium was determined, where the majority of uranium accumulated in/to the plant roots. The availability of uranium in soils and its uptake by plants can thus be classified as generally low. Furthermore, some soil parameters were identified which seem to favor a higher uranium-availability. This study found that very high and very

  3. Bulk division of metallogenetic region and uranium metallogenetic regularities in Heilongjiang basin and its adjacent areas

    International Nuclear Information System (INIS)

    Guo Hua; Zhao Fengmin; Hu Shaokang; Chen Zuyi

    2002-01-01

    On the base of the study in the working area, a conclusion is made that there are 36 combined types of tectonic-material and 6 basic tectonic units. According to radioactive geochemical quantitative and qualitative factors, which are relevant to rock composition and geological formation, 5 radioactive geochemical provinces and 8 radioactive geochemical differentiation regions could be marked out. The working area contains three hydrogeological fold belts and two hydrogeological artesian basins. It could also be divided into 9 metallogenetic provinces or 30 metallogenetic regions, or 206 ore districts. On the other hand, the area could be divided into 2 uranium metallogenetic provinces, 2 potential uranium metallogenetic provinces and 3 uraniferous provinces, which contain uranium properties or potential uranium properties or uraniferous properties. The authors systematically summary the geological environment and indicators of prospecting and predicting of fluorine-molybdenum-uranium formation, hydromorphic uranium deposit formation and poly-genetic uranium deposit formation which contains uranium-coal model, uranium-asphalt model, uranium-sulfuret model, etc. The metallogenetic potential among Aerdan uranium province, Aoliaokema uranium province, Bulieya-Jiamusi-Xingkai potential uranium province and Xihuote-Alin uranium province are assessed. On this base, the authors delineate 23 uranium metallogenetic prospective areas needing further exploration efforts. 8 uranium metallogenetic prospective areas in China are marked out, which are areas of interest for searching for exogenetic and epigenetic sandstone uranium deposits

  4. The structure environment, rock-magma system, mineral-forming series and pattern of volcanic mineral-forming of uranium deposit in southeast of China

    International Nuclear Information System (INIS)

    Yu Dagan

    1992-01-01

    The Volcanic uranium deposit of rock-magma belt-the Mid-Cz Volcano in the Southeast of China mainly formed around 120 ∼ 130 Ma and 90 ∼ 100 Ma Which is in harmony with the two rock magma activities of k within the region. The rock-magma system of this period formed around the turning period from pressure to tension in the continent margin of southeast China, which is mainly characterized by the appearance of A-type granite and alkaline, sub-alkaline rocks (trachyte, trachyandensite, trachybasalt, basic rock alkaline basalt). The uranium deposit is controlled by the base rift of dissection to the mantle, the volcanic basin is of the double characteristics of transversal rift valley basin (early period) ad tension rift valley basin (laster period). The leading role of the deep source is stressed in terms of internal-forming series of volcanic uranium deposits is considered to exist; and also in terms of internal-forming series of volcanic uranium deposits is considered to exist; and also in terms of mineral-forming patterns, the multi-pattern led by the deep-source is stressed, including the mineral-forming pattern of uranium deposit of continental thermos, repeated periphery mineral-forming pattern of uranium deposit and the mineral-forming pattern of uranium deposit of rising pole-like thermos. Ten suggestions are put forward to the next mineral-search according to the above thoughts

  5. Groundwater prospecting for sandstone-type uranium deposits: the merits of mineral-solution equilibria versus single element tracer methods. Volume II

    International Nuclear Information System (INIS)

    Wanty, R.B.; Langmuir, D.; Chatham, J.R.

    1981-08-01

    This report presents the results of further research on the groundwater geochemistry of 96 well waters in two uraniferous aquifers in Texas and Wyoming, and is a continuation of the work presented by Chatham et al. (1981). In this study variations in concentrations of U, As, Mo, Se and V were compared with the saturation state of the groundwater with respect to mineral phases of these elements known or expected to occur in each area. The non-radiogenic trace elements exhibited strong redox dependence consistent with thermodynamic predictions, but their variations did not pinpoint existing uranium ore bodies, because of a shift in groundwater flow patterns since the time of ore emplacement. Saturation levels of trace element minerals such as realgar, native Se, and molybdenite showed broad anomalies around the ore-bearing areas, similar to patterns found for U minerals by Langmuir and Chatham (1980), and Chatham et al. (1981). The radiogenic elements Ra and Rn showed significant anomalies directly within the ore zones. Helium anomalies were displaced in the direction of groundwater flow, but by their magnitude and areal extent provided strong evidence for the existence of nearby uranium accumulations. Uranium isotope ratios showed no systematic variations within the two aquifers studied. Saturation maps for kaolinite, illite, montmorillonite and the zeolites analcime and clinoptilolite provided 1 to 2 km anomalies around the ore at the Texas site. Saturation values for the gangue minerals pyrite and calcite defined the redox interface and often suggested the position of probable uranium mineralization. When properly used, the groundwater geochemical concepts for exploration can accurately pinpoint uranium mineralization at a fraction of the cost of conventional methods that involve test drilling and geophysical and core logging

  6. Groundwater prospecting for sandstone-type uranium deposits: the merits of mineral-solution equilibria versus single element tracer methods. Volume II

    Energy Technology Data Exchange (ETDEWEB)

    Wanty, R.B.; Langmuir, D.; Chatham, J.R.

    1981-08-01

    This report presents the results of further research on the groundwater geochemistry of 96 well waters in two uraniferous aquifers in Texas and Wyoming, and is a continuation of the work presented by Chatham et al. (1981). In this study variations in concentrations of U, As, Mo, Se and V were compared with the saturation state of the groundwater with respect to mineral phases of these elements known or expected to occur in each area. The non-radiogenic trace elements exhibited strong redox dependence consistent with thermodynamic predictions, but their variations did not pinpoint existing uranium ore bodies, because of a shift in groundwater flow patterns since the time of ore emplacement. Saturation levels of trace element minerals such as realgar, native Se, and molybdenite showed broad anomalies around the ore-bearing areas, similar to patterns found for U minerals by Langmuir and Chatham (1980), and Chatham et al. (1981). The radiogenic elements Ra and Rn showed significant anomalies directly within the ore zones. Helium anomalies were displaced in the direction of groundwater flow, but by their magnitude and areal extent provided strong evidence for the existence of nearby uranium accumulations. Uranium isotope ratios showed no systematic variations within the two aquifers studied. Saturation maps for kaolinite, illite, montmorillonite and the zeolites analcime and clinoptilolite provided 1 to 2 km anomalies around the ore at the Texas site. Saturation values for the gangue minerals pyrite and calcite defined the redox interface and often suggested the position of probable uranium mineralization. When properly used, the groundwater geochemical concepts for exploration can accurately pinpoint uranium mineralization at a fraction of the cost of conventional methods that involve test drilling and geophysical and core logging.

  7. Lung cancer in uranium miners: A tissue resource and pilot study. Progress report, September 25, 1992 - May 31, 1993

    International Nuclear Information System (INIS)

    Samet, J.M.

    1993-05-01

    This project involves two related activities directed toward understanding respiratory carcinogenesis in radon-exposed former uranium miners. The first activity involves a continuation of the tissue resource of lung cancer cases from former underground uranium miners and comparison cases from non-miners. The second activity is a pilot study for a proposed longitudinal study of respiratory carcinogenesis in former uranium miners. The objectives are to facilitate the investigation of molecular changes in radon exposed lung cancer cases and to develop methods for prospectively studying clinical, cytologic, cytogenetic, and molecular changes in the multi-event process of respiratory carcinogenesis, and to assess the feasibility of recruiting former uranium miners into a longitudinal study that collects multiple biologic specimens

  8. Mineral transformations and magnetic properties: example of an uranium rich front of oxido-reduction

    International Nuclear Information System (INIS)

    Mergaux, O.; Samama, J.C.

    1987-01-01

    In sedimentary environments, the mineral associations and the associated magnetic properties may be ascribed to superimposed processes of sedimentation, diagenesis and epigenesis. In the case of uranium sandstone deposits, the epigenetic processes of oxido-reduction are responsible for both concentration in uranium and specific mineral transformations which are related to variations in the magnetic properties of the rocks. These variations are illustrated by the Treville deposit (Southwestern France), where uranium rich bodies have developed within the Tertiary sandstones. The unaltered sandstones are characterized by a low magnetic susceptibility (scarcity of ferrimagnetic species but abundance of paramagnetic species). The siderite rich facies forming part of the front does not display any significant change in the mean magnetic susceptibility whilst the uranium-pyrite facies which belongs to the same front indicates a much lower susceptibility. The mean susceptibility facies resulting from pyrite and siderite oxidation remains unchanged. The facies of alteration of the iron rich silicates is responsible for higher susceptibility. The comparison between measured susceptibility and computed susceptibility helps in interpreting the role of the various species in the overall susceptibility of the rocks. It may also help in restituting the mineral associations from magnetic and chemical logging

  9. The study of logistic regression of risk factor on the death cause of uranium miners

    International Nuclear Information System (INIS)

    Wen Jinai; Yuan Liyun; Jiang Ruyi

    1999-01-01

    Logistic regression model has widely been used in the field of medicine. The computer software on this model is popular, but it is worth to discuss how to use this model correctly. Using SPSS (Statistical Package for the Social Science) software, unconditional logistic regression method was adopted to carry out multi-factor analyses on the cause of total death, cancer death and lung cancer death of uranium miners. The data is from radioepidemiological database of one uranium mine. The result show that attained age is a risk factor in the logistic regression analyses of total death, cancer death and lung cancer death. In the logistic regression analysis of cancer death, there is a negative correlation between the age of exposure and cancer death. This shows that the younger the age at exposure, the bigger the risk of cancer death. In the logistic regression analysis of lung cancer death, there is a positive correlation between the cumulated exposure and lung cancer death, this show that cumulated exposure is a most important risk factor of lung cancer death on uranium miners. It has been documented by many foreign reports that the lung cancer death rate is higher in uranium miners

  10. Preliminary study of the uranium favorability of the Jornada Del Muerto Basin and adjacent areas, South Central New Mexico

    International Nuclear Information System (INIS)

    Templain, C.J.; Dotterrer, F.E.

    1978-06-01

    Data indicate that possible uranium host rocks include the Precambrian rocks, the Ordovician Bat Cave Formation and Cable Canyon Sandstone, the Permian Abo Formation, Lower Cretaceous Dakota Sandstone, and the Upper Cretaceous-lower Tertiary McRae Formation. The Cenozoic sequence contains possible host beds; little is known, however, about its stratigraphy. Secondary uranium mineralization is found associated with faults in the Jornada area. All fault zones there are possible sites for uranium deposition. Possible sources for uranium in the Jornada del Muerto area include uraniferous Precambrian rocks, tuffaceous beds in the McRae Formation, and the Tertiary Datil and Thurman Formations. Hydrothermal solutions may have deposited the veinlike fluorite deposits, of which the purple varieties were found to be radioactive during this study

  11. Mineral resources of the Turtle Mountains Wilderness Study Area, San Bernardino County, California

    Science.gov (United States)

    Howard, Keith A.; Nielson, Jane E.; Simpson, Robert W.; Hazlett, Richard W.; Alminas, Henry V.; Nakata, John K.; McDonnell, John R.

    1988-01-01

    At the request of the U.S. Bureau of Land Management, approximately 105,200 acres of the Turtle Mountains Wilderness Study Area (CDCA-307) were evaluated for mineral resources (known) and resource potential (undiscovered). In this report, the area studied is referred to as "the wilderness study area" or simply "the study area"; any reference to the Turtle Mountain Wilderness Study Area refers only to that part of the wilderness study area for which a mineral survey was requested by the U.S. Bureau of Land Management.The wilderness study area is in southeastern San Bernardino County, Calif. Gold, silver, copper, and lead have been mined within and adjacent to the study area. Copper-zinc-silver-gold mineral occurrences are found in the southern part and gold-silver mineral occurrences are found in the northern part of the study area; identified low- to moderate-grade gold-silver resources occur adjacent to the study area along the western boundary. Six areas in the south-central and northwestern parts of the study area have high resource potential, two broad areas have moderate resource potential, and part of the southwest corner has low resource potential for lode gold, silver, and associated copper, lead, zinc, molybdenum, and tungsten. Alluvium locally within one of these areas has moderate resource potential for placer gold and silver, and the entire area has low resource potential for placer gold and silver. There is low resource potential for perlite, ornamental stone (onyx marble and opal), manganese, uranium and thorium, pegmatite minerals, and oil and gas within the study area. Sand and gravel are abundant but are readily available outside the wilderness study area.

  12. Unexpected rates of chromosomal instabilities and alterations of hormone levels in Namibian uranium miners

    International Nuclear Information System (INIS)

    Zaire, R.; Notter, M.; Thiel, E.

    1997-01-01

    A common problem in determining the health consequences of radiation exposure is factoring out other carcinogenic influences. The conditions in Namibia provide a test case for distinguishing the effects of long-term low-dose exposure to uranium from the other environmental factors because of good air quality and the lack of other industries with negative health effects. Present records indicate a much higher prevalence of cancer among male workers in the open-pit uranium mine in Namibia compared with the general population. The objective of the present study was to determine whether long-term exposure to low doses of uranium increases the risk of a biological radiation damage which would lead to malignant diseases and to derive a dose-response model for these miners. To investigate this risk, we measured uranium excretion in urine, neutrophil counts and the serum level of FSH, LH and testosterone and analyzed chromosome aberrations in whole blood cells using fluorescence in situ hybridization. A representative cohort of 75 non-smoking, HIV-negative miners was compared to a control group of 31 individuals with no occupational history in mining. A sixfold increase in uranium excretion among the miners compared to the controls was recorded (P < 0.001). Furthermore, we determined a significant reduction in testosterone levels (P < 0.008) and neutrophil count (P < 0.0001). Most remarkably, cells with multiple aberrations such as open-quotes rogueclose quotes cells were observed for the first time in miners; these cells had previously been found only after short-term high-dose radiation exposure, e.g. from the Hiroshima atomic bomb or the Chernobyl accident. 19 refs., 1 fig., 3 tabs

  13. The relations between hydrodynamic characteristics and interbedding oxidation zone type uranium mineralization

    International Nuclear Information System (INIS)

    Bai Jingping

    2001-01-01

    Infiltrating type hydrodynamic way controls the formation of interbedding oxidation zone type uranium deposit. The author analyzes hydrodynamic condition of Songliao basin and concludes that during evolution and development of Songliao basin, Water-bearing petrofabric of Mingshui Formation and above inherit completely infiltrating hydrodynamic way as they were deposited and that Sifangtai Formation inherit the way to some extent, that below Sifangtai Formation water bearing petrofabric were completely reformed in northern part of Songliao watershed. The contact line between infiltrating and out filtrating type hydrodynamic way, e.g. underground water dividing lines formed in different geological period, restricts development of interbedding oxidation zone in this period and controls uranium mineralization

  14. Characteristics of Chongan ring structure and its controlling role on uranium mineralization

    International Nuclear Information System (INIS)

    Liu Linqing

    2001-01-01

    A large ring structure has been discovered in Chong'an region on the basis of geological interpretation of remote sensing images. The data acquired from analysis of regional geology and in-situ investigation indicate that the ring structure is initiated during caledonian and activated for several times afterwards; It displays the highest activity during Yanshanian. Under the effect of this structure, Gulou-Masha lenticular geological body was firmed, controlling the regional distribution of uranium mineralization and anomalies occur in forms of central and bilateral symmetry. The data indicate that it is prospective to prospect uranium deposit in this region; therefore, more work should be placed on the deep levels

  15. Study on tertiary in-situ leachable uranium mineralization conditions in South Songliao basin

    International Nuclear Information System (INIS)

    Zhang Zhenqiang; Li Guokuan; Zhao Zonghua; Zhang Jingxun

    2001-01-01

    Tertiary in-situ leachable mineralization in Songliao Basin was analyzed in theory in the past. Since 1998, regional investigation at 1:200000 scale has been done with about 120 holes drilled. Based on drill holes recording, section compiling and sample analysis, the authors investigate into the Tertiary in-situ leachable conditions including rock character, sedimentary facies, rock chemistry, organic substances, uranium content, sandstone porosity, sandstone bodies, interlayer oxidation, and hydro-dynamic value. The study would play important role in prospecting for in-situ leachable uranium in South Songliao basin

  16. Geologic-radiometric techniques applied for uranium prospection at the Hierro-Cayo Largo area

    International Nuclear Information System (INIS)

    Gongora, L.E.; Olivera, J.

    1995-01-01

    Using geologic-radiometric techniques uraniferous anomalies were evaluated at the Hierro-Cayo Largo area located in Pinar del Rio province. During the uranium prospection works at most promising areas, geologic itineraries and gamma ray, radon emanation spectrometric survey were done. Trenches were made and some boreholes were drilled (up to 20-30 m depth). In addition a lot of samples were taken in order to determine the amount of U, Ra, Th, y K by spectrometric techniques. As result of this investigation, a geological placing, a mineralogical and geochemical characteristic of uraniferous mineralization was possible to find out. The appropriate prospection indications for uranium exploration at Esperanza geologic zone were defined

  17. Minerals Yearbook, volume II, Area Reports—Domestic

    Science.gov (United States)

    ,

    2018-01-01

    The U.S. Geological Survey (USGS) Minerals Yearbook discusses the performance of the worldwide minerals and materials industries and provides background information to assist in interpreting that performance. Content of the individual Minerals Yearbook volumes follows:Volume I, Metals and Minerals, contains chapters about virtually all metallic and industrial mineral commodities important to the U.S. economy. Chapters on survey methods, summary statistics for domestic nonfuel minerals, and trends in mining and quarrying in the metals and industrial mineral industries in the United States are also included.Volume II, Area Reports: Domestic, contains a chapter on the mineral industry of each of the 50 States and Puerto Rico and the Administered Islands. This volume also has chapters on survey methods and summary statistics of domestic nonfuel minerals.Volume III, Area Reports: International, is published as four separate reports. These regional reports contain the latest available minerals data on more than 180 foreign countries and discuss the importance of minerals to the economies of these nations and the United States. Each report begins with an overview of the region’s mineral industries during the year. It continues with individual country chapters that examine the mining, refining, processing, and use of minerals in each country of the region and how each country’s mineral industry relates to U.S. industry. Most chapters include production tables and industry structure tables, information about Government policies and programs that affect the country’s mineral industry, and an outlook section.The USGS continually strives to improve the value of its publications to users. Constructive comments and suggestions by readers of the Minerals Yearbook are welcomed.

  18. Minerals Yearbook, volume III, Area Reports—International

    Science.gov (United States)

    ,

    2018-01-01

    The U.S. Geological Survey (USGS) Minerals Yearbook discusses the performance of the worldwide minerals and materials industries and provides background information to assist in interpreting that performance. Content of the individual Minerals Yearbook volumes follows:Volume I, Metals and Minerals, contains chapters about virtually all metallic and industrial mineral commodities important to the U.S. economy. Chapters on survey methods, summary statistics for domestic nonfuel minerals, and trends in mining and quarrying in the metals and industrial mineral industries in the United States are also included.Volume II, Area Reports: Domestic, contains a chapter on the mineral industry of each of the 50 States and Puerto Rico and the Administered Islands. This volume also has chapters on survey methods and summary statistics of domestic nonfuel minerals.Volume III, Area Reports: International, is published as four separate reports. These regional reports contain the latest available minerals data on more than 180 foreign countries and discuss the importance of minerals to the economies of these nations and the United States. Each report begins with an overview of the region’s mineral industries during the year. It continues with individual country chapters that examine the mining, refining, processing, and use of minerals in each country of the region and how each country’s mineral industry relates to U.S. industry. Most chapters include production tables and industry structure tables, information about Government policies and programs that affect the country’s mineral industry, and an outlook section.The USGS continually strives to improve the value of its publications to users. Constructive comments and suggestions by readers of the Minerals Yearbook are welcomed.

  19. Mortality analyses in the updated French cohort of uranium miners (1946-2007)

    Energy Technology Data Exchange (ETDEWEB)

    Rage, E.; Caer-Lorho, S.; Drubay, D.; Ancelet, S.; Laurier, D. [Institute for Radiological Protection and Nuclear Safety (IRSN), Fontenay-aux-Roses (France). PRP-HOM, SRBE, LEPID; Laroche, P. [AREVA, Paris La Defense (France). Direction Sante

    2015-08-15

    The objectives are to analyze mortality risks in the extended follow-up of the French uranium miners' cohort and to examine their potential relation to occupational exposure to ionizing radiation (IR). The total cohort includes 5,086 uranium miners employed in the CEA-COGEMA group and followed up from 1946 to 2007. Vital status, causes of death, and cumulative radon exposures were recorded. The post-55 subcohort includes 3,377 miners first employed after 1955, for whom long-lived radionuclides (LLR) and external gamma-ray exposure were also recorded. External mortality analyses were performed by computing standardized mortality ratios (SMR). Excess relative risks (ERRs) due to IR exposures were estimated from Poisson regression models. The miners included in the total cohort were followed up for 35.4 years and exposed to 36.6 working level months (WLM) on average. There was no evidence of a difference in overall mortality between miners and the general French male population. Miners had a statistically significant excess mortality rate from lung cancer (SMR = 1.34 [95 % CI 1.16-1.53]) and from kidney cancer (SMR = 1.60 [1.03-2.39]). Cumulative radon exposure was significantly associated with lung cancer risk (ERR/100 WLM = 0.71 [0.31-1.30]) and cerebrovascular risk (ERR/100 WLM = 0.41 [0.04-1.03]). In the post-55 subcohort, this excess mortality from lung cancer remained associated with exposure to radon, and also with exposure to LLR and external gamma rays. Conclusions The analyses in the extended follow-up strengthen the results previously observed among French uranium miners about their excess risk of mortality and its association with their occupational IR exposure.

  20. Mortality analyses in the updated French cohort of uranium miners (1946-2007)

    International Nuclear Information System (INIS)

    Rage, E.; Caer-Lorho, S.; Drubay, D.; Ancelet, S.; Laurier, D.; Laroche, P.

    2015-01-01

    The objectives are to analyze mortality risks in the extended follow-up of the French uranium miners' cohort and to examine their potential relation to occupational exposure to ionizing radiation (IR). The total cohort includes 5,086 uranium miners employed in the CEA-COGEMA group and followed up from 1946 to 2007. Vital status, causes of death, and cumulative radon exposures were recorded. The post-55 subcohort includes 3,377 miners first employed after 1955, for whom long-lived radionuclides (LLR) and external gamma-ray exposure were also recorded. External mortality analyses were performed by computing standardized mortality ratios (SMR). Excess relative risks (ERRs) due to IR exposures were estimated from Poisson regression models. The miners included in the total cohort were followed up for 35.4 years and exposed to 36.6 working level months (WLM) on average. There was no evidence of a difference in overall mortality between miners and the general French male population. Miners had a statistically significant excess mortality rate from lung cancer (SMR = 1.34 [95 % CI 1.16-1.53]) and from kidney cancer (SMR = 1.60 [1.03-2.39]). Cumulative radon exposure was significantly associated with lung cancer risk (ERR/100 WLM = 0.71 [0.31-1.30]) and cerebrovascular risk (ERR/100 WLM = 0.41 [0.04-1.03]). In the post-55 subcohort, this excess mortality from lung cancer remained associated with exposure to radon, and also with exposure to LLR and external gamma rays. Conclusions The analyses in the extended follow-up strengthen the results previously observed among French uranium miners about their excess risk of mortality and its association with their occupational IR exposure.

  1. Biogeochemical aspects of uranium mineralization, mining, milling, and remediation

    Science.gov (United States)

    Campbell, Kate M.; Gallegos, Tanya J.; Landa, Edward R.

    2015-01-01

    Natural uranium (U) occurs as a mixture of three radioactive isotopes: 238U, 235U, and 234U. Only 235U is fissionable and makes up about 0.7% of natural U, while 238U is overwhelmingly the most abundant at greater than 99% of the total mass of U. Prior to the 1940s, U was predominantly used as a coloring agent, and U-bearing ores were mined mainly for their radium (Ra) and/or vanadium (V) content; the bulk of the U was discarded with the tailings (Finch et al., 1972). Once nuclear fission was discovered, the economic importance of U increased greatly. The mining and milling of U-bearing ores is the first step in the nuclear fuel cycle, and the contact of residual waste with natural water is a potential source of contamination of U and associated elements to the environment. Uranium is mined by three basic methods: surface (open pit), underground, and solution mining (in situ leaching or in situ recovery), depending on the deposit grade, size, location, geology and economic considerations (Abdelouas, 2006). Solid wastes at U mill tailings (UMT) sites can include both standard tailings (i.e., leached ore rock residues) and solids generated on site by waste treatment processes. The latter can include sludge or “mud” from neutralization of acidic mine/mill effluents, containing Fe and a range of coprecipitated constituents, or barium sulfate precipitates that selectively remove Ra (e.g., Carvalho et al., 2007). In this chapter, we review the hydrometallurgical processes by which U is extracted from ore, the biogeochemical processes that can affect the fate and transport of U and associated elements in the environment, and possible remediation strategies for site closure and aquifer restoration.This paper represents the fourth in a series of review papers from the U.S. Geological Survey (USGS) on geochemical aspects of UMT management that span more than three decades. The first paper (Landa, 1980) in this series is a primer on the nature of tailings and radionuclide

  2. Fluorimetric determination of uranium in certain refractory minerals, environmental samples and industrial waste materials

    International Nuclear Information System (INIS)

    Premadas, A.; Saravanakumar, G.

    2005-01-01

    A simple sample decomposition and laser fluorimetric determination of uranium at trace level is reported in certain refractory minerals, like ilmenite, rutile, zircon and monazite; environmental samples viz. soil and sediments; industrial waste materials, such as, coal fly ash and red mud. Ilmenite sample is decomposed by heating with ammonium fluoride. Rutile, zircon and monazite minerals are decomposed by fusion using a mixture of potassium bifluoride and sodium fluoride. Environmental and industrial waste materials are brought into solution by treating with a mixture of hydrofluoric and nitric acids. The laser induced fluorimetric determination of uranium is carried out directly in rutile, zircon and in monazite minerals and after separation in other samples. The determination limit was 1 μg x g -1 for ilmenite, soil, sediment, coal fly ash and red mud samples, and it is 5 μg x g -1 for rutile, zircon and monazite. The method is also developed for the optical fluorimetric determination of uranium (determination limit 10 μg x g -1 ) in ilmenite, rutile, zircon and monazite minerals. The methods are simple, accurate, and precise and they require small quantity of sample and can be applied for the routine analysis. (author)

  3. Uranium miner lung cancer study. Progress report, July 1, 1975--July 1, 1976

    International Nuclear Information System (INIS)

    Saccomanno, G.

    1976-01-01

    This study on the rate of lung cancer development in uranium miners was initiated in 1957 by the U. S. Public Health and many facets of this project are reaching final objectives. Many new studies have developed in the course of this study and will continue. The projects supported by The Energy Research and Development Administration are of utmost importance and consist of: collection of material from uranium miners known to have cancer of the lung into a tumor registry; manual on pulmonary cytology; regression study of sputum cytological findings in uranium miners who showed marked atypical squamous cell metaplasia and have quit smoking cigarettes, mining, or both; continuation of sputum collection and collection of lungs from deceased miners, and the development of instruments such as uv fiber-optic bronchoscopes for localization of carcinoma in situ of the lung. Approximately 75,000 sputum samples were examined over the last 19 years in cases that showed normal cytology at the inception of study and subsequently developed carcinoma of the lung and resulted in an accumulation of material that is worthy of study

  4. Somatic cell genetics of uranium miners and plutonium workers. A biological dose-response indicator

    International Nuclear Information System (INIS)

    Brandom, W.F.; Bloom, A.D.; Bistline, R.W.; Saccomanno, G.

    1978-01-01

    Two populations of underground uranium miners and plutonium workers work in the state of Colorado, United States of America. We have explored the prevalence of structural chromosome aberrations in peripheral blood lymphocytes as a possible biological indicator of absorbed radiation late-effects in these populations. The uranium miners are divided into four exposure groups expressed in Working Level Months (WLM), the plutonium workers into six groups with estimated 239 Pu burdens expressed in nCi. Comparison of chromosome aberration frequency data between controls, miners, and plutonium workers demonstrate: (1) a cytogenetic response to occupational ionizing radiation at low estimated doses; and (2) an increasing monotonic dose-response in the prevalence of complex (all exchange) or total aberrations in all exposure groups in these populations. We also compared trends in the prevalence of aberrations per exposure unit (WLM and nCi) in each exposure subgroup for each population. In the uranium miners, the effects per WLM seem to decrease monotonically with increasing dose, whereas in the Pu workers the change per nCi appears abrupt, with all exposure groups over 1.3 nCi (minimum detectable level) having essentially similar rates. The calculations of aberrations per respective current maximum permissible dose (120 WLM and 40 nCi) for the two populations yield 4.8 X 10 -2 /100 cells for uranium miners and 90.6 X 10 -2 /100 cells for Pu workers. Factors which may have influenced this apparent 20-fold increase in the effectiveness of plutonium in the production of complex aberrations (9-fold increase in total aberrations) are discussed. (author)

  5. Pulsed neutron gama ray logging for minerals associated with uranium

    International Nuclear Information System (INIS)

    Jensen, D.H.; Humphreys, D.R.; Stephenson, W.A.; Weinlein, J.H.; Bivens, H.M.

    1980-01-01

    The tool uses a pulsed neutron generator to irradiate the nuclei in the formation surrounding the borehole, and N type, high purity, germanium detector to observe the returning gamma rays. The presence or absence of particular elements, in conjunction with information gained from other logs, is expected to predict the location of uranium deposits away from the borehole. The Proof of Principle probe has been assembled. Tests have been run using an external power supply with a resolution better than 2.6 keV. Experiments in a simulated borehole configuration with a pulsed neutron generator have established an output level of 1 x 10 5 neutrons/pulse for the detection of inelastic, capture, and activation gamma rays. Gating of the ADC was shown to improve the signal-to-noise ratio for specific gamma ray lines

  6. Epidemiological study on lung cancer of uranium miners

    International Nuclear Information System (INIS)

    Yuan Liyun; Gu Juanjuan

    1994-01-01

    Lung cancer among 13360 male workers of 5 uranium mines were investigated. During the period of observation (Jan, 1971-Dec. 1985) 35 lung cancers were registered; among them 24 were in exposed group and 11 in control group. Standard mortality of lung cancer for these two groups were 21.42·10 -5 and 15.94·10 -5 , respectively. SMR were 1.83 (exposed group) and 1.44 (control group) (P<0.01). The average latent period of lung cancer in exposed group was 17.5 years, and the average cumulative exposure dose to radon daughters was 168 WLM. The average age of workers dead of lung cancer was 47.83 years. The excess RR coefficient of lung cancer was 1.07%/WLM. SMR increased with increasing cumulative exposure dose to radon daughters. The adjusted mortality of long cancer of smokers in exposed group was obviously higher than that of nonsmokers

  7. Uranium mineralization in the ring complex of Taperuaba, CE, Brazil

    International Nuclear Information System (INIS)

    Haddad, R.C.

    1981-01-01

    The study of the uraniferous deposit in the Northeast has been increased in last year, because of the discovery of many anomalies containing phosphate uraniferous mineralization. The anomalies in vila de Taperuaba at Ceara were examined. The petrografic, structural and geochemical study of the Taperuaba Ring complex, is made, in an attempt to estabilish the ore genesis and its probable controls. (L.H.L.L.) [pt

  8. Inventory of uranium prospect area Rantau Prapat North Sumatra: general prospection stage

    International Nuclear Information System (INIS)

    Wusana, Y.; Djalil, A.; Sriyono; Sutriyono, A.; Sajiyo

    2000-01-01

    The research has been carried out to gain knowledge of geology, radiometry, geochemistry to bound U prospect area scale 1:50.000. Based on investigation result of preliminary prospection was obtained indication of uranium mineralization as stream sediment anomalies in meta sandstone (Perm-Carboniferous) 0.86-28.00 ppm, sandstone (Middle-Upper Miosen) 1.192-7.20 ppm, granite (Upper Permian) 10.71-12.00 ppm; The total U content in sandstone until 10.29 ppm, granite 33.24 ppm, and radiometry of stand stone 25-150 cps, granite 200-500 cps. Lithology of the prospect area consist of quartzite, phyllitte, sandstone, siltstone, clay stone, conglomerate, granite, quartz feldspatic veins, andesite, tufaceous. Strike slip fault, normal fault, foliation and folding has been obtained in these area. Uranium anomalies of stream sediments were found in Conglomerate-Stand stone (1.04-4.80) ppm, Quartzite-Phyllite (0.91-1.90) ppm and Granite units (9.81-13.20) ppm. Uranium content of Conglomerate-stand stone (2.5-5) ppm, quartzite-phyllite (3.0-46.0) ppm, tuffaceous (9.0-22.0) ppm and granite (biotite muscovite) (23.5-40.0) ppm. Granite in these area is as uranium source. Based on anomaly of stream sediments on Conglomerate-Stand stone unit only about 7.64 km 2 , Quartzite-Phyllite 12.04 km 2 , Granite 10.20 km 2 and no supported by heavy mineral anomalies, radiometry and U rock content, so it was advised to not investigate follow up. (author)

  9. Selection of mining method for No.3 uranium ore body in the independent mining area at a uranium mine

    International Nuclear Information System (INIS)

    Ding Fulong; Ding Dexin; Ye Yongjun

    2010-01-01

    Mining operation in the existed mining area at a uranium mine is near completion and it is necessary to mine the No.3 uranium ore body in another mining area at the mine. This paper, based on the geological conditions, used analogical method for analyzing the feasible methods and the low cost and high efficiency mining method was suggested for the No.3 ore body in the independent mining area at the uranium mine. (authors)

  10. Geological investigation of uranium deposits at southwest of Chungju area

    International Nuclear Information System (INIS)

    Kim, J.H.; Park, J.W.; Kim, J.T.; Kim, D.E.; Im, H.C.

    1982-01-01

    A geologic investigation has been carried out at the southwest of Chungju area for the exploration of uranium ore deposit. A trace element geochemistry was supplemented to study the genesis of uranium ore deposit. The uraniferous black slate is interbedded with meta-argillaceous rock formation correlative to the Munjuri formation of Ogcheon group. The uranium rich carbonaceous slate is distributed discontinuously in three places. The discontinuity of the slate is probably due to the deformation of Daebo Orogeny. The grade of the ore bodies is 396-495 ppm U 3 O 8 , Vanadium 1.47-0.48%V 2 O 5 and fixed carbon 18.16-8.54%. The width of outcrop is 10.3m-2.5m. The semiquantitative spectrographic analysis of 4 samples in the above ore zone revealed that the average of minor elements contents are Ba 3025, Be 1.5, Cd 131, Cu53, Co 12, Cr 155, Ga<10, Mo 83, Pb 66, Ni 183, Sr 22, and Zr 196 in ppm. Analysed the 33 major and trace elements in 20 samples including above are samples from drill-cores and trenched rocks from Ogcheon black slate indicates that the uranium has positive correlation with Fe(0.47), Mo (0.45) and Ba(0.38). In the uranium deposits of Ogcheon black slate, we can accept the theory of syngenitic origin where uranium occurs with unusually high content of minor elements in black slate. The elements were introduced at the same time with the mud deposition without significant later addition. Mechanism of emplacement might be fixation of living organisms and absorption of decaying organic matter from sea water. An intensive study is necessary for futher understanding of redistribution and recrystallization of uranium by metamorphism. (Author)

  11. A geological-radiometric uranium survey in the Tlaxiaco area of the State of Oaxaca

    International Nuclear Information System (INIS)

    Guillen R, O.E.

    1981-01-01

    Explorations were effected in the northwestern part of the State of Oaxaca neighbouring the city of Tlaxiaco and lying within the Oaxaca-Mixteca province. The survey comprised a regional area of 642.2.K, in which abnormalities auspicious to the presence of mineral uranium had previously been found. The area of interest, initially limited to a strip 10 kilometers long by 1/2 kilometers wide, showed evidence, however, of an even greater extension. Among the lithological units found of predominate interest were clastic, sedimentary rocks, mezozoic carbonate rocks, and extrusive and intrusive igneous rocks. From the high radiometric values obtained, the extrusive pyroclastic rocks showed more favourable signs of the presence of uranium ore and were considered of chief uranium significance in the area. Minerological, structural and lithological detectors (guides) have been set up in the area for an extensive location of abnormalities. The work based on regionally conducted geological and radiological surveys followed by detailed area of interest studies. (author)

  12. Spectrophotometric determination of uranium by previous extraction chromatography separation in polimetalic mineral, phosphorites and technological licours

    International Nuclear Information System (INIS)

    Moreno Bermudez, J.; Cabrera Quevedo, C.; Alfonso Mendez, L.; Rodriguez Aguilera, M.

    1994-01-01

    The development of an analytical procedure for spectrophotometric determination of uranium in polimetalic mineral, phosphorites and technological licours is described. The method is based on the previous separation of interfering elements by extraction chromatography and on spectrophotometric determination of uranium (IV) with arsenazo III in concentrated hydrochloric acid. Tributyl phosphate impregnate on politetrafluoroethylene is used as stationary phase and 5.5 M nitric acid is used as movie phase. The influence of matrix-component elements was studies. The development procedure was applied to real samples, being the results compared with those obtained by other well established analytical methods like gamma-spectrometry, laser fluorimetric, spectrophotometry previous uranium separation by liquid liquid extraction and anion exchange. The reproducibility is evaluated and the detection limited has been established for each studied matrix. A procedure for correcting the thorium interference has been developed for samples with a Th/ 3U8O higher than 0.2

  13. Chemical process for recovery of uranium values contained in phosphoric mineral lixivia

    International Nuclear Information System (INIS)

    Conceicao, E.L.H. da; Awwal, M.A.; Coelho, S. V.

    1980-01-01

    A recovery process of uranium values from phosporic mineral lixivia for obtaining uranio oxide concentrate adjusted to specifications of purity for its commercialization the process consists of the adjustment of electromotive force of lixiviem to suitable values for uranium extraction, extraction with organic solvent containing phosphoric acid ester and oxidant reextraction from this solvent with phosphoric acid solution, suggesting a new solvent extraction containing synergetic mixture of di-2-ethyl hexyl phosphoric acid and tri-octyl phosphine, leaching this solvent with water and re-extraction/precipitation with ammonium carbonate solution, resulting in the formation of uranyl tricarbonate and ammonium, that by drying and calcination gives the uranium oxide with purity degree for commercialization. (M.C.K.) [pt

  14. Methods of mineral potential assessment of uranium deposits: A mineral systems approach

    International Nuclear Information System (INIS)

    Jaireth, S.

    2014-01-01

    Conclusions: • Choice of methods depends on the objective; • Basics: – Know your mineral system (deposit-type): SCIENCE; – Create useful datasets: A MUST; • Mineral system approach can be rewarding. For successful examples visit GA’s website; • Don’t overdo or oversell it (only detailed exploration such as drilling can find a deposit)

  15. Trace uranium determination in beverages and mineral water using fission track techniques

    International Nuclear Information System (INIS)

    Cheng, Y.L.; Lin, J.Y.; Hao, X.H.

    1993-01-01

    The uranium contents of beverages and mineral water have been estimated using the technique of fission track analysis with polycarbonate detector. The U contents in beverages have been found to vary from 0.26 ± 0.03 to 1.65 ± 0.07 ppb, the average value is 0.93 ± 0.05 ppb. The mean U content in mineral water is 9.20 ± 0.16 ppb, which is ∼ 10 times higher than the mean U content of beverages. The present study shows the high U content in mineral water, indicating need for further investigation of U content in mineral water for the studies of radiation health hazards. (Author)

  16. Age specific interactions between smoking and radon among United States uranium miners

    International Nuclear Information System (INIS)

    Steenland, K.

    1994-01-01

    United States uranium miners who smoked have death rates from lung cancer that are intermediate between the rates predicted by the additive and multiplicative models (on a ratio scale) across all age groups. Age specific patterns of interaction have not been thoroughly examined, and most analyses have been internal ones in which there was no truly non-exposed group. Here age specific death rates of lung cancer among ever smoking uranium miners have been examined for conformity with the additive and multiplicative models. The multiplicative model fits well for the youngest and oldest categories, but poorly for the middle age ranges. In the middle age range, predicted rates under the multiplicative model were quite high, surpassing the corresponding United States death rates for all causes combined. (Author)

  17. 238U, 234U and 230Th in uranium miners' lungs

    International Nuclear Information System (INIS)

    Singh, N.P.; Wrenn, M.E.; Bennett, D.B.; Archer, V.; Saccomanno, G.

    1982-01-01

    Fourteen uranium miners' lungs from the Colorado Plateau were collected at autopsy and the concentrations of 238 U, 234 U and 230 Th were determined by radiochemical procedures utilizing solvent extraction and alpha spectrometric techniques. The uranium and thorium isotopes are in near equilibrium with average concentrations of 238 U, 234 U and 230 Th being 89.3, 95.2, and 91.1 pCi/kg respectively. The combined average radiation dose rate to lung from these three isotopes is about 24.1 mrad/year at death excluding the unmeasured contribution from the 226 Ra and daughters. The average concentration of 230 Th is about 65 times higher than the mean concentration of 230 Th in lungs of non-miners from the same region dying at comparable ages

  18. 238U, 234U and 230Th in uranium miners' lungs

    International Nuclear Information System (INIS)

    Singh, M.P.; Wrenn, M.E.; Archer, V.E.; Saccomanno, G.

    1981-01-01

    Fourteen uranium miners' lungs from Colorado plateau were collected at autopsy and the concentrations of 238 U, 234 U and 230 Th were determined by radiochemical procedures utilizing solvent extraction - alpha spectrometric techniques. The uranium and thorium isotopes are in near equilibrium with average concentrations of 238 U, 234 U and 230 Th being 89.3, 95.2 and 91.1 pCi/kg respectively. The combined average radiation dose rate to lung from these three isotopes is about 24.2 mrad/year at death excluding the unmeasured contribution from the 226 Ra and daughters. The average concentration of 230 Th is about 65 times higher than the mean concentration of 230 Th in lungs of non-miners dying at comparable ages from the same region

  19. Radon exposure, cigarette smoking, and other mining experience in the beaverlodge uranium miners cohort

    International Nuclear Information System (INIS)

    L'Abbe, K.A.; Howe, G.R.; Burch, J.D.; Miller, A.B.; Abbatt, J.; Band, P.; Choi, W.; Du, J.; Feather, J.; Gallagher, R.

    1991-01-01

    A nested case-control study within the Beaverlodge Uranium Miners Cohort was undertaken to assess any possible contribution of confounding by smoking and other mining experience to the risk estimate derived from the original cohort study. Next of kin have been interviewed for 46 lung cancer cases and 95 controls enrolled in the Beaverlodge Uranium Miners Cohort Study who died between 1950 and 1980. Confounding by cigarette smoking and other mining experience appears unlikely to have contributed to the relative risk coefficient for exposure to Rn decay products derived in the parent study. Data for smoking and exposure to Rn decay products are consistent with a multiplicative model, although considerable caution must be applied to this interpretation

  20. Distributed regularity of accompanying element and its deep prospecting significances in Guizhou 504 uranium mineral deposit

    International Nuclear Information System (INIS)

    Zhang Weiqian; Huang Kaiping; Cheng Guangqing

    2012-01-01

    In the 504 hydrotherm type mineral deposit, Mo, Hg, Ni, Re, Te, Se element (Mo, Hg are industrial mineral deposit and Ni, Re, Te, Se are scarce element) reach the industrial integrated utilization request, the scarce element widely distributed in acid orebody (upper ore zone) and alkali orebody (lower ore zone). Based on composite samples of uranium ore in the analysis, through computer processing, the linear regression and R-factor analysis, Reveals the relationship between uranium and other elements. They haven't correlation among the U, Hg, Mo. The relation- ship among the Ni, Re, Te, Se is germane. Using this correlation, deep in the deposit and surrounding exploration provides the basis for deep. (authors)

  1. Study on Regional Geology and Uranium Mineralization of Schwaner Mountains West and Central Kalimantan

    International Nuclear Information System (INIS)

    Soepradto-Tjokrokardono; Djoko-Soetarno; MS; Liliek-Subiantoro; Retno-Witjahyati

    2004-01-01

    Uranium occurrences indication in Kalimantan has been discovered at metamorphic and granites rocks of Schwaner Mountains as the radioactivity and geochemical anomalies. A regional geology of Schwaner Mountains show a watershed of West and East Kalimantan consist of Pinoh metamorphic rocks that was intruded by tonalitic and granitic batholite. The goal of this study is to observe the mechanism of the Uranium occurrences related to the regional tectonic, metamorphic rocks, tonalite and granitic batholite. Permokarbonaferrous metamorphic rocks as the big masses of roof pendant within tonalite mass. The metamorphic rocks originally as the big masses of roof pendant within tonalite mass. The metamorphic rocks originally derived from sedimentary process that produce a high content of uranium as well as a fine grained volcanic material. This uranium is deposited within neritic facies. Those sediments have been metamorphosed by low grade Abukuma regional metamorphism at the condition about 540 o C and 2000 bar. In early Cretaceous Tonalite of Sep auk intruded the rock and both metamorphics and tonalites. Those rocks were intruded by Late Cretaceous alkalin granite of Sukadana. Those crystalline rocks overlaid by an unconformity-related Kampari and Tebidah Formations that including within Melawi Group of Tertiary age. Uranium mineralization as the centimetric-metric veins related to tectonic N 100 o -110 o E and N 50 o E lineaments. Uranium was interpreted as a volcanic sedimentary origin, than it re mobilized by low grade regional metamorphism process. This enuchment process was carried out by fluor, boron and other metalliferous mineral within hydrothermal solutions of Sukadana granite. (author)

  2. Ianthinite: A rare hydrous uranium oxide mineral from Akkavaram ...

    Indian Academy of Sciences (India)

    In the area of ianthinite occurrence (figure 1), the basement ... Akkavaram area, from where ianthinite is reported. (figure 1), falls in ... feldspar grains from separated yellowish material .... oxidizing environment and its relevance to the disposal.

  3. Sedimentology of the Westwater Canyon and Brushy Basin Members, Upper Jurassic Morrison Formation, Colorado Plateau, and relationship to uranium mineralization

    International Nuclear Information System (INIS)

    Turner-Peterson, C.E.

    1987-01-01

    The Westwater Canyon Member was deposited by eastward-flowing, high energy, intermittent streams that drained a source area of diverse lithologies. Multi-channel river systems exhibited only minor downstream changes, most notably a slight increase in the amount of lateral accretion deposition. During deposition of the overlying Brushy Basin Member, a large saline, alkaline lake developed in an area that encompasses both the San Juan basin and the Paradox basin. Alteration of airborne volcanic ash that became incorporated in the lake sediments resulted in a lateral zonation of authigenic minerals that resembles the zonation characteristic of Cenozoic saline, alkaline lakes. The lake, named Lake T'oo'dichi, is the largest and oldest saline, alkaline lake known. Localization of primary uranium ore in the Grants uranium region, New Mexico, is more related to depositional facies in the Brushy Basin Member than to any special attribute of the host sandstones in the Westwater Canyon Member. Coincidence of depositional facies in the Brushy Basin Member with ore distribution and ore-related alteration patterns in the Westwater Canyon Member suggests a model in which humic acids originated in pore waters of smectitic mudstones of the Brushy Basin Member and moved downward into the underlying sandstones of the Westwater Canyon Member. Here, the humic acids precipitated to form humin layers that subsequently concentrated uranium from ground water to form the orebodies

  4. Mineral resources of the South Mccullough Mountains Wilderness Study Area, Clark County, Nevada

    International Nuclear Information System (INIS)

    DeWitt, E.; Anderson, J.L.; Barton, H.N.; Jachens, R.C.; Podwysocki, M.H.; Brickey, D.W.; Close, T.J.

    1989-01-01

    The authors present a study of 19,558 acres of the South McCullough Mountains Wilderness Study Area. The study area contains no identified mineral resources and has no areas of high mineral resource potential. However, five areas that make up 20 percent of the study area have a moderate potential either for undiscovered silver, gold, lead, copper, and zinc resources in small vein deposits; for lanthanum and other rare-earth elements, uranium, thorium, and niobium in medium-size carbonatite bodies and dikes; for tungsten and copper in small- to medium-size vein deposits; or for silver and gold in small vein or breccia-pipe deposits. Six areas that makeup 24 percent of the study area have an unknown resource potential either for gold, silver, lead, and copper in small vein deposits; for gold, silver, lead, zinc, copper, and arsenic in small vein or breccia-pipe deposits; for lanthanum and other rare-earth elements, uranium, thorium, and niobium in medium-size carbonatite bodies and dikes; or for tungsten and copper in small vein deposits

  5. Separation of Actinium 227 from the uranium minerals

    International Nuclear Information System (INIS)

    Martinez-Tarango, S.

    1991-01-01

    The purpose of this work was to separate Actinium 227, whose content is 18%, from the mineral carnotite found in Gomez Chihuahua mountain range in Mexico. The mineral before processing is is pre-concentrated and passed, first through anionic exchange resins, later the eluate obtained is passed through cationic resins. The resins were 20-50 MESH QOWEX and 100-200 MESH 50 X 8-20 in some cased 200-400 MESH AG 50W-X8, 1X8 in other cases. The eluates from the ionic exchange were electrodeposited on stainless steel polished disc cathode and platinum electrode as anode; under a current ODF 10mA for 2.5 to 5 hours and of 100mA for .5 of an hour. it was possible to identify the Actinium 227 by means of its descendents, TH-227 and RA-223, through alpha spectroscopy. Due to the radiochemical purity which the electro deposits were obtained the Actinium 227 was low and was not quantitatively determined. A large majority of the members of the natural radioactive series 3 were identified and even alpha energies reported in the literature with very low percentages of non-identified emissions were observed. We conclude that a more precise study is needed concerning ionic exchange and electrodeposit to obtain an Actinium 227 of radiochemical purity. (Author)

  6. Coincidence of lung cancer and silicosis in Czechoslovak uranium miners

    International Nuclear Information System (INIS)

    Urban, S.; Urbanova, S.

    1988-01-01

    27 patients with established coincidence of lung cancer and silicosis from a group of 1607 cases of lung cancer from radioactive compounds, and 166 cases of pneumoconiosis were reported by the Occupational Diseases Ward of the works Institute of National Health in Uranium Industry in the 1962 to 1986 years. Lung cancer was found in 16% of reported silicosis patients, in 81% it was simple silicosis, in 50% of cases in was an epidermoid type of cancer. In two cases the malignant process originated in the silicotic node, in one case from a tuberculoma. Lung cancer occurred most frequently in the right lower lung region. The mean age of the silicosis group was 48.6 years and 56.0 years for the lung cancer group. No difference was thus seen from the mean age of patients with lung cancer from radioactive compounds diagnosed in the years 1976 to 1980 but it was significantly lower that the reported average age of patients with coincidence of lung cancer and pneumoconiosis in the population not exposed to ionizing radiation. (author). 2 figs., 1 tab., 18 refs

  7. Phurcalite: a rare secondary calcium uranium phosphate mineral from Putholi, Chittaurgarh District, Rajasthan

    International Nuclear Information System (INIS)

    Singh, Yamuna; Singh, K.D.P.; Bhatt, A.K.

    1999-01-01

    X-ray powder diffraction data are presented for phurcalite [Ca 2 (UO 2 ) 3 (PO 4 ) 2 (OH) 4 , 4H 2 O], with orthorhombic symmetry, a very rare, yellow coloured, secondary uranium mineral, from Putholi (24 o 57' 45 : 74 o 38' 30). The host rock is quartzite which contains fluoroapatite, pyrite, goethite, hematite, magnetite, chlorite and mica as accessory minerals. Measured cell parameters of the phurcalite are : a = 17.3416 A, b=16.1138 A and c =13.5491 A, with a cell volume of 3786.16 A. (author)

  8. Studies on radioactivity distribution and radioactive mineral identification in uranium ores from Espinharas (PB), Brazil

    International Nuclear Information System (INIS)

    Oliveira, G.N.M. de.

    1979-01-01

    Studies about the identification of radioactive minerals in uranium bearing rocks from Espinharas (PB), Brazil are presented. Autoradiography with α-sensitive nuclear emulsions was utilized for determining radioctivity distributions and for localizing radioactive minerals, in combination with microscopy, X-ray diffractometry, PIXE and eletron microprobe analysis for its identification. Mineralized gneisse and feldspatic rock, the two principal samples studied, show distinct differences in radioactive distribution patterns, however the main carriers for U and Th seem to be the same. Microanalysis shows that elements are associated with Si, Ca, Fe and Al an some trace elements like Y, Zr, Ti, etc. U and Th are distributed uniformly in feldspatic rock and inhomogeneously in mineralized gneisse, indicating that the zonary structure of the radioactive cristals, frequently observed in gneisse, could be due to variable U:Th ratios. Chemical analysis, X-ray diffraction datas and microscopic studies indicates that the principal carrier for radioactivity in the rocks of Espinharas is a silicate mineral of U and Th, probably situaded in the series of transition: Coffinite -> uraninite, thorogummite -> thorianite. Some additional experiments about leachability of uranium with diluted sulfuric acid are reported, which confirm the different nature of radioactivity distribution in feldspatic and gneissic rocks. (author) [pt

  9. Mineral transformation and biomass accumulation associated with uranium bioremediation at Rifle, Colorado.

    Science.gov (United States)

    Li, Li; Steefel, Carl I; Williams, Kenneth H; Wilkins, Michael J; Hubbard, Susan S

    2009-07-15

    Injection of organic carbon into the subsurface as an electron donor for bioremediation of redox-sensitive contaminants like uranium often leads to mineral transformation and biomass accumulation, both of which can alter the flow field and potentially bioremediation efficacy. This work combines reactive transport modeling with a column experiment and field measurements to understand the biogeochemical processes and to quantify the biomass and mineral transformation/accumulation during a bioremediation experiment at a uranium contaminated site near Rifle, Colorado. We use the reactive transport model CrunchFlow to explicitly simulate microbial community dynamics of iron and sulfate reducers, and their impacts on reaction rates. The column experiment shows clear evidence of mineral precipitation, primarily in the form of calcite and iron monosulfide. At the field scale, reactive transport simulations suggest that the biogeochemical reactions occur mostly close to the injection wells where acetate concentrations are highest, with mineral precipitate and biomass accumulation reaching as high as 1.5% of the pore space. This work shows that reactive transport modeling coupled with field data can bean effective tool for quantitative estimation of mineral transformation and biomass accumulation, thus improving the design of bioremediation strategies.

  10. Respiratory disease mortality among uranium miners as related to height, radiation, smoking, and latent period

    International Nuclear Information System (INIS)

    Archer, V.E.; Gillam, J.D.; James, L.A.

    1975-11-01

    A prospective mortality study using a life table method was done on 3366 white underground uranium miners, and 1231 surface workers. Observed deaths were found to exceed those expected from respiratory cancer, pneumoconiosis and related diseases, and accidents related to work. Exposure - response relationships with radiation varied with cigarette smoking and with height of workers. Of four factors involved in both malignant and nonmalignant respiratory diseases (height, free silica, cigarette smoking and alpha radiation), radiation was considered to be most important

  11. On the genesis and dynamics of mineral waters of Essentuki deposit in the Great Region of Caucasian Mineral Waters on the basis of uranium isotope information

    International Nuclear Information System (INIS)

    Chalov, P.I.; Tikhonov, A.I.; Kiselev, G.P.; Merkulova, K.I.

    1991-01-01

    The sources of the Great Region of Caucasian Mineral Waters are established and contribution of each source in the formation of this region is determined using the data on isotopic ratio and content of uranium in mineral waters. The investigation relies on the fact that 234 U/ 238 U radioactivity ratio used as a tracer in different for waters which drain the rocks with different content and distribution of uranium therein. The investigation results reveal the peculiarities of the geological history of the above region and can be used for predicting new deposits of mineral waters

  12. gold mineralization in Masjeddaghi area, east of Jolfa, NW Iran

    OpenAIRE

    Ali Imamalipour; Hossein Abdoli; Behzad Hajalilo

    2010-01-01

    Two types of mineralization including porphyry copper and epithermal gold mineralization have occurred in relation with an intermediate volcano-plutonic complex in Masjeddaghi area. Different alterations including silica, advanced argillic, intermediate argillic and propylitic have been distinguished in relation with epithermal mineralization, which have a zonal pattern. Elemental mass gains and losses during alterations were calculated using Zr as an immobile monitor. Silica zone has enriche...

  13. Uranium mineralization distribution sounding at ANO CRN.1-ANO CG.6 Mentawa sector using radon gas measurement

    International Nuclear Information System (INIS)

    Paimin; Sartapa; Darmono, S.

    2000-01-01

    The investigation was based on Systematic Prospection (1996,1997) at Mentawa River and Ampola up stream which were found radiometry anomalous about 750-15.000 c/s on the metasilt outcrop. Form of uranium mineralization is uraninite which associate with tourmaline, quartz, and sulphide and fills WNW-ESE fracture. The aims of investigation were to know uranium mineralization in sub surface by radon gas measurement, surface radiometry, and topographical mapping. (author)

  14. Latency issues in epidemiologic studies of lung cancer in uranium miners

    International Nuclear Information System (INIS)

    Sever, L.E.; Petersen, G.R.

    1982-12-01

    Considerable evidence suggests that the risk of lung cancer is elevated in uranium miners exposed to radon daughter products. Important in understanding the risk of lung cancer in this population is evaluation of the time relationship of exposure to disease occurrence, that is, consideration of data relevant to the latent period. In this presentation we address theoretical considerations relating to the latent period in cohort studies and review methodological issues in research on uranium miners. We examine the problems associated with determining latent periods in censored cohort studies and suggest means of overcoming them. We discuss extant studies of lung cancer among uranium miners from the perspective of the impact of censored data on published conclusions regarding latency. In addition, we consider evidence regarding the length of the latent period in these studies and present data to support conclusions that the latent period may be: (1) more than 40 years; (2) dependent on age at which exposure begins; (3) dependent on exposure rate; and (4) related to smoking habits

  15. Uranium and base metal dispersion studies in the Maquire Lake area, Saskatchewan

    International Nuclear Information System (INIS)

    Sopuck, V.J.; Lehto, D.A.W.; Alley, D.W.

    1980-03-01

    The objective of this study was to study uranium and base metal dispersion in various sample media occurring in the Maguire Lake area of Saskatchewan: bedrock, overburden, lake water, and lake sediments. Factors controlling partitioning of metals among various sample media were investigated, and lake sediment data were interpreted in terms of the factors to determine the significance of lake sediment data in indicating local mineralization. The association between organic matter contents and metal contents was found to vary between lake-center and nearshore sediments. Nickel, cobalt and zinc in lake sediments are strongly controlled by hydroxide precipitation and are less dependent on bedrock type. The concentration of Fe in center-lake sediments appears to reflect only the physicochemical parameters in the lake. Uranium and copper are strongly controlled by and preferentially concentrated in the organic matter; however, in center-lake sediments with >12 percent organic matter, U and Cu strongly reflect rock type

  16. Interaction of radon and smoking among czech uranium miners

    International Nuclear Information System (INIS)

    Tomasek, L.

    2011-01-01

    The study is based on a case-control study nested within a cohort study (11 000 miners and 1074 lung cancers). The controls were individually matched by year of birth and attained age. Smoking data were collected in person or from relatives of deceased subjects or from medical files. The study resulted in 850 cases of lung cancer with smoking data. The linear dependence of lung cancer relative risk (RR) on radon exposure adjusted for smoking was not substantially different from analyses when smoking was ignored and reflected mainly the risk among smokers. However, the excess RR per unit exposure among never smokers (70 cases) was substantially higher in comparison with that in smokers, reflecting differences in lung morphometry and clearance. The RRs from combined effects are substantially lower than the risk derived from the multiplicative model, but somewhat higher than those from the additive model. The work was supported by the Czech Ministry of Health (IGA NS 10596). (authors)

  17. Spectral discrimination of uranium-mineralized breccia pipes in northwestern Arizona

    International Nuclear Information System (INIS)

    Kwarteng, A.Y.; Goodell, P.C.; Pingitore, N.E. Jr.; Wenich, K.J.

    1989-01-01

    The price of uranium is currently the lowest in more than a decade. The only type of uranium deposit that is economically viable in the depressed uranium market is such high-grade ore as the unconformity type found in Canada and Australia. Exploration for uranium-bearing breccia pipes in northwestern Arizona by both domestic and foreign companies is currently active because of the relatively high-grade ore they contain and their tendency to be polymetallic. In the US, uranium-mineralized breccia pipes are one of the few deposits that can compete in the current market. A stepwise discriminant analysis was performed on spectral data acquired from the field, laboratory, and Landsat thematic mapper (TM). The principal objectives were (1) to investigate the fundamental differences in the spectral properties of outcrops on the surface of breccia pipes and the background, (2) to choose TM bandpasses that were statistically optimum for distinguishing between breccia pipes and the background, and (3) to compare the results of the field, laboratory, and TM digital data which were acquired by different instruments having different spatial and spectral resolutions

  18. Uranium tailings research at the Canada Centre for Mineral and Energy Technology (CANMET)

    International Nuclear Information System (INIS)

    Haw, V.A.; Ritcey, G.M.; Skeaff, J.M.; Dave, N.; Silver, M.

    1982-09-01

    There are over 100 million metric tons of uranium tailings on the surface of Canada, an amount that is expected to increase threefold by the end of the century. Because of their potential hazard to the environment and man, the Canada Centre for Mineral and Energy Technology (CANMET) began a major program ten years ago to examine the problem of uranium tailings management. Vegetation of uranium tailings has been successful using seed mixtures planted on the tailings surface pretreated by lime and fertilizer. Lysimeter tests on uranium tailings have demonstrated that surface treatment and the presence or absence of bacteria have a marked effect on the flow and chemistry of seepage water. Hydrogeochemical studies of the tailings have shown that acid conditions prevail in the upper zone of the tailings (i.e., above the water table) and that both radioactive and other toxic chemicals are concentrated near the bottom of the tailings. Work has been done in cooperation with others on the precipitation and removal of 226 Ra from tailings water effluent by BaCl 2 . Investigation into pre-concentrating the ore prior to acid leaching has demonstrated that virtually all the radionuclides and sulphides can be concentrated into a fraction amounting to from 30 to 40 percent of the original feed, leaving a relatively clean tailing. We are still far from our objective of demonstrating, with reasonable assurance, effective methods for the long-term management of uranium tailings. An accelerated program is outlined

  19. 210Pb in bone in vivo - a biodosimeter for assessing uranium miner radon progeny exposure

    International Nuclear Information System (INIS)

    Guilmette, R.A.; Snipes, M.B.; Hoover, M.D.; Leggett, R.W.; Laurer, G.R.; Lambert, W.E.; Coons, T.A.; Gilliland, F.D.

    2002-01-01

    A joint analysis of the results of 11 epidemiological studies of lung cancer among uranium miners has shown a significant level of variability in the relative risk per unit of exposure - in the range of a factor of 30 (Lubin et al., 1994). A significant fraction of the uncertainty associated with these risk coefficients may be due to differences in the methods and quality of data used in calculating cumulative exposures, in WLM, for the various miner populations. We hypothesize that in vivo measurement of 210 Pb, a long-lived radon decay product that is retained in bone, will provide an improved measure of Rn progeny exposures received by individual miners during their mining careers. To accomplish such in vivo measurements, the lovelace in vivo bioassay facility (LIVBF) was modified to obtain an optimized counting geometry for measuring 210 Pb in the skull. Six 12.7 cm diameter phoswich detectors were positioned about the head of a reclining subject (one in the posterior, and one in the anterior position, and four about the mid-sagittal plane), and photon emission from the skull was measured using anticoincidence multichannel analysis electronics. We analyzed the in vivo data from about 90 former uranium miners from the grants mining district, and compared the recorded WLM exposures for each uranium miner (data from the UNM epidemiological data base) with a WLM exposure calculated using a model developed specifically for this study. This model couples a Pb biokinetic model with the ICRP publication 66 respiratory tract dosimetry model. The analyses show that the independent measurements of exposure are statistically correlated, but with a large degree of variability occurring among individual values, and that a major source of uncertainty in mining exposure estimation is the uncertainty involved in accounting for non-mining sources of 210 Pb. (orig.)

  20. Clay mineralogical studies on Bijawars of the Sonrai Basin: palaeoenvironmental implications and inferences on the uranium mineralization

    International Nuclear Information System (INIS)

    Jha, Surendra Kumar; Shrivastava, J.P.; Bhairam, C.L.

    2012-01-01

    Clays associated with the Precambrian unconformity-related (sensu lato) uranium mineralization that occur along fractures of Rohini carbonate, Bandai sandstone and clay-organic rich black carbonaceous Gorakalan shale of the Sonrai Formation from Bijawar Group is significant. Nature and structural complexity of these clays have been studied to understand depositional mechanism and palaeoenvironmental conditions responsible for the restricted enrichment of uranium in the Sonrai basin. Clays ( chlorite> illite > smectite mineral assemblages, whereas, Solda Formation contains kaolinite > illite > chlorite clays. It has been found that the former mineral assemblage resulted from the alteration process is associated with the uranium mineralization and follow progressive reaction series, indicating palaeoenvironmental (cycles of tropical humid to semi-arid/arid) changes prevailed during maturation of the Sonrai basin. The hydrothermal activity possibly associated with Kurrat volcanics is accountable for the clay mineral alterations

  1. GIS-based identification of areas with mineral resource potential for six selected deposit groups, Bureau of Land Management Central Yukon Planning Area, Alaska

    Science.gov (United States)

    Jones, James V.; Karl, Susan M.; Labay, Keith A.; Shew, Nora B.; Granitto, Matthew; Hayes, Timothy S.; Mauk, Jeffrey L.; Schmidt, Jeanine M.; Todd, Erin; Wang, Bronwen; Werdon, Melanie B.; Yager, Douglas B.

    2015-01-01

    This study, covering the Bureau of Land Management (BLM) Central Yukon Planning Area (CYPA), Alaska, was prepared to aid BLM mineral resource management planning. Estimated mineral resource potential and certainty are mapped for six selected mineral deposit groups: (1) rare earth element (REE) deposits associated with peralkaline to carbonatitic intrusive igneous rocks, (2) placer and paleoplacer gold, (3) platinum group element (PGE) deposits associated with mafic and ultramafic intrusive igneous rocks, (4) carbonate-hosted copper deposits, (5) sandstone uranium deposits, and (6) tin-tungsten-molybdenum-fluorspar deposits associated with specialized granites. These six deposit groups include most of the strategic and critical elements of greatest interest in current exploration.

  2. The actual status of uranium ore resources at Eko Remaja Sector: the need of verification of resources computation and geometrical form of mineralization zone by mining test

    International Nuclear Information System (INIS)

    Johan Baratha; Muljono, D.S.; Agus Sumaryanto; Handoko Supalal

    1996-01-01

    Uranium ore resources calculation was done after ending all of geological work step. Estimation process of ore resources was started from evaluation drilling, continued with borehole logging. From logging, the result has presented in anomaly graphs, then was processed to determine thickness and grade value of ore. Those mineralization points were correlated one another to form mineralization zones which have direction of N 270 degree to N 285 degree with 70 degree dip to North. From Grouping the mineralization distribution, 19 mineralization planes was constructed which contain 553 ton of U 3 O 8 measured. It is suggested that before expanding measured ore deposit area, mining test should be done first at certain mineralization planes to prove the method applied to calculate the reserve. Results form mining test could be very useful to reevaluate all the work-step done. (author); 4 refs; 2 tabs; 8 figs

  3. Early Jurassic mafic dykes from the Aigao uranium ore deposit in South China: Geochronology, petrogenesis and relationship with uranium mineralization

    Science.gov (United States)

    Zhang, Di; Zhao, Kui-Dong; Chen, Wei; Jiang, Shao-Yong

    2018-05-01

    Mafic dykes are abundant and widely distributed in many granite-hosted uranium ore deposits in South China. However, their geochronology, petrogenesis and relationship with uranium mineralization were poorly constrained. In this study, apatite U-Pb dating, whole-rock major and trace element and Sr-Nd-Pb isotope analysis were conducted for the dolerite dykes from the Aigao uranium ore deposit. Apatite U-Pb isotopic data indicate that the mafic dykes were emplaced at Early Jurassic (189 ± 4 Ma), which provides new evidence for the rarely identified Early Jurassic magmatism in South China. Pyroxene from the dykes is mainly augite, and plagioclase belongs to albite. The dolerite samples have relatively low SiO2 contents (45.33-46.79 wt%), relatively high total alkali contents (K2O + Na2O = 4.11-4.58 wt%) and Al2O3 contents (13.39-13.80 wt%), and medium MgO contents (4.29-5.16 wt%). They are enriched in Nb, Ta, Ti, rare earth elements and depleted in Rb, K, Sr, Th, showing the typical OIB-like geochemical affinity. All the dolerite samples show homogeneous Sr-Nd-Pb isotopic compositions, with (87Sr/86Sr)i varying from 0.706049 to 0.707137, εNd(t) from +4.6 to +5.2, 206Pb/204Pb from 19.032 to 19.126 and 207Pb/204Pb from 15.641 to 15.653. The mafic dykes in the Aigao deposit should be derived from the partial melting of the asthenospheric mantle and formed in a within-plate extensional environment. The emplacement age of the mafic dykes is older than the uranium mineralization age. Therefore, CO2 in ore-forming fluids couldn't originate from the basaltic magma as suggested by previous studies. The dolerite dykes might only provide a favorable reducing environment to promote the precipitation of uraninite from oxidize hydrothermal fluids.

  4. Assessment of industrial minerals and rocks in the controlled area

    International Nuclear Information System (INIS)

    Castor, S.B.; Lock, D.E.

    1996-01-01

    Yucca Mountain in Nye County, Nevada, is a potential site for a permanent repository for high-level nuclear waste in Miocene ash flow tuff. The Yucca Mountain controlled area occupies approximately 98 km 2 that includes the potential repository site. The Yucca Mountain controlled area is located within the southwestern Nevada volcanic field, a large area of Miocene volcanism that includes at least four major calderas or cauldrons. It is sited on a remnant of a Neogene volcanic plateau that was centered around the Timber Mountain caldera complex. The Yucca Mountain region contains many occurrences of valuable or potentially valuable industrial minerals, including deposits with past or current production of construction aggregate, borate minerals, clay, building stone, fluorspar, silicate, and zeolites. The existence of these deposits in the region and the occurrence of certain mineral materials at Yucca Mountain, indicate that the controlled area may have potential for industrial mineral and rock deposits. Consideration of the industrial mineral potential within the Yucca Mountain controlled area is mainly based on petrographic and lithologic studies of samples from drill holes in Yucca Mountain. Clay minerals, zeolites, fluorite, and barite, as minerals that are produced economically in Nevada, have been identified in samples from drill holes in Yucca Mountain

  5. Assessment of industrial minerals and rocks in the controlled area

    Energy Technology Data Exchange (ETDEWEB)

    Castor, S.B. [Nevada Bureau of Mines and Geology, Reno, NV (United States); Lock, D.E. [Mackay School of Mines, Reno, NV (United States)

    1996-08-01

    Yucca Mountain in Nye County, Nevada, is a potential site for a permanent repository for high-level nuclear waste in Miocene ash flow tuff. The Yucca Mountain controlled area occupies approximately 98 km{sup 2} that includes the potential repository site. The Yucca Mountain controlled area is located within the southwestern Nevada volcanic field, a large area of Miocene volcanism that includes at least four major calderas or cauldrons. It is sited on a remnant of a Neogene volcanic plateau that was centered around the Timber Mountain caldera complex. The Yucca Mountain region contains many occurrences of valuable or potentially valuable industrial minerals, including deposits with past or current production of construction aggregate, borate minerals, clay, building stone, fluorspar, silicate, and zeolites. The existence of these deposits in the region and the occurrence of certain mineral materials at Yucca Mountain, indicate that the controlled area may have potential for industrial mineral and rock deposits. Consideration of the industrial mineral potential within the Yucca Mountain controlled area is mainly based on petrographic and lithologic studies of samples from drill holes in Yucca Mountain. Clay minerals, zeolites, fluorite, and barite, as minerals that are produced economically in Nevada, have been identified in samples from drill holes in Yucca Mountain.

  6. Detection of certain minerals of uranium, zinc, lead and other metals using photoluminescence

    International Nuclear Information System (INIS)

    Seigel, H.O.; Robbins, J.C.

    1980-01-01

    We have discovered that certain photoluminescent minerals of uranium, lead, zinc, fluorine, tungsten and other elements which may naturally occur at the surface of the earth can be selectively detected in the presence of most other photoluminescent minerals and organic materials which are likely to occur at the earth's surface. The base of selective ldetection is the discovery that the lifetimes of photoluminescent emission of materials in the latter class are much shorter than the lifetimes of photoluminescent emission of materials in the former class. This invention utilizes this discovery in the detection of minerals of uranium, zinc, lead, flourine, tungsten, molybdenum, mercury and other elements. In one embodiment of the invention, using a laser or other short duration source of optical excitation, measurements of the photoluminescent response of the earth are made at times sufficiently long for the photoluminescence of other common and unwanted sources to have substantially decayed, thereby selectively detection and identifying certain minerals of potiential economic interest. In another embodiment a source of light is modulated at a predetermined frequency and the photoluminescent response of the earth which is out-of-phase with the source is measured. In a third embodiment this source of light may be incident solar radiation after passage through asuitable modulator

  7. Uranium occurrences in the pegmatite 'Las Cuevas', province of San Luis, Argentine Republic

    International Nuclear Information System (INIS)

    Daziano, C.O.; Karlsson, A.C.; Ayala, R.

    1993-01-01

    Mineral associations found in an uranium deposit of Sierras Pampeanas, San Luis, are considered in these papers. Damourite stands out among the uranium minerals related to uraninite and coffinite. Pyrite, marcasite and other sulphides are found together with apatite and gummite. Autunite is the uranium secondary mineral more abundant. A mineralization with epigenetic contribution by circulating solutions is suggested to the studied area. (Author)

  8. A study on mineralization U,REE and related processes in anomaly No.6 Khoshomy area central Iran

    International Nuclear Information System (INIS)

    Heidaryan, F.

    2005-01-01

    Uranium mineralization in Khoshomy prospect, located in central. part of Iran, with 303-15000 (cps) and 14 to 4000 (ppm) released, The main rock types include: gneiss, granite, pegmatite and migmatite, that influenced by pegmatite-albitic vines (quartz-heldespatic). Acidic and basic dykes, granodioritic, units and dolomite and marble have been seen. The alteration associated with the mineralization is potassic, argillic, propylitic, carbonization, silisificaition and hematitizaition. Uranium mineralization occurred in a hydrothermal phase with Cu, Mo, Ni and Au elements. Uranium primary minerals include pitchblende, coffinite, uraninite; and uranium secondary minerals include uranophane and . boltwoodite. REE mineralization occurred by the potassic phase in peginatitization process

  9. Radiological assessment of an area with uranium residual material

    International Nuclear Information System (INIS)

    Perez-Sanchez, Danyl; Cancio, David; Alvarez, Alicia

    2008-01-01

    As a result of a pilot project developed at the old Spanish 'Junta de Energia Nuclear' to extract uranium from ores, tailings materials were generated. Most of these residual materials were sent back to different uranium mines, but a small amount of it was mixed with conventional building materials and deposited near the old plant until the surrounding ground was flattened. The affected land is included in an area under institutional control and used as recreational area. At the time of processing, uranium isotopes were separated but other radionuclides of the uranium decays series as 230 Th, 226 Ra and daughters remain in the residue. Recently, the analyses of samples taken at different ground's depths confirm their presence. This paper presents the methodology used to calculate the derived concentration level to ensure the reference dose level of 0.1 mSv y-1 used as radiological criteria. In this study, a radiological impact assessment was performed modelling the area as recreational scenario. The modelization study was carried out with the code RESRAD considering as exposure pathways, external irradiation, inadvertent ingestion of soil, inhalation of resuspended particles, and inhalation of outdoor radon ( 222 Rn). As result was concluded that, if the concentration of 226 Ra in the first 15 cm of soil is lower than, 0.34 Bq g-1 , the dose would not exceed the reference dose. Applying this value as a derived concentration level and comparing with the results of measurements on the ground, some areas with a concentration of activity slightly higher than latter were found. In these zones the remediation proposal has been to cover with a layer of 15 cm of clean material. This action represents a reduction of 85% of the dose and ensures compliance with the reference dose. (author)

  10. Incidence of non-lung solid cancers in Czech uranium miners: A case-cohort study

    International Nuclear Information System (INIS)

    Kulich, M.; Rericha, V.; Rericha, R.; Shore, D.L.; Sandler, D.P.

    2011-01-01

    Objectives: Uranium miners are chronically exposed to radon and its progeny, which are known to cause lung cancer and may be associated with leukemia. This study was undertaken to evaluate risk of non-lung solid cancers among uranium miners in Pribram region, Czech Republic. Methods: A retrospective stratified case-cohort study in a cohort of 22,816 underground miners who were employed between 1949 and 1975. All incident non-lung solid cancers were ascertained among miners who worked underground for at least 12 months (n=1020). A subcohort of 1707 subjects was randomly drawn from the same population by random sampling stratified on age. The follow-up period lasted from 1977 to 1996. Results: Relative risks comparing 180 WLM (90th percentile) of cumulative lifetime radon exposure to 3 WLM (10th percentile) were 0.88 for all non-lung solid cancers combined (95% CI 0.73-1.04, n=1020), 0.87 for all digestive cancers (95% CI 0.69-1.09, n=561), 2.39 for gallbladder cancer (95% CI 0.52-10.98, n=13), 0.79 for larynx cancer (95% CI 0.38-1.64, n=62), 2.92 for malignant melanoma (95% CI 0.91-9.42, n=23), 0.84 for bladder cancer (95% CI 0.43-1.65, n=73), and 1.13 for kidney cancer (95% CI 0.62-2.04, n=66). No cancer type was significantly associated with radon exposure; only malignant melanoma and gallbladder cancer showed elevated but non-significant association with radon. Conclusions: Radon was not significantly associated with incidence of any cancer of interest, although a positive association of radon with malignant melanoma and gallbladder cancer cannot be entirely ruled out. - Research highlights: → Uranium miners are chronically exposed to radon. → We evaluate risk of non-lung solid cancers among uranium miners. → No cancer type was significantly associated with radon exposure. → Malignant melanoma and gallbladder cancer showed non-significant elevated risk.

  11. Study on the uranium mineralization genesis of the Cachoeira, Lagoa Real, Bahia, mine, as auxiliary in the discovery and comprehension of mineral beds; Estudo da genese da mineralizacao uranifica da mina da Cachoeira, Lagoa Real, BA, como auxilio na descoberta e compreensao de jazidas minerais

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Lucilia Aparecida Ramos de; Rios, Francisco Javier; Chaves, Alexandre de Oliveira; Pereira, Ana Rosa Passos [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)]. E-mail: laro@cdtn.br

    2007-07-01

    The acknowledgement of the geological history of a ore reserve allows to infer relative to a large area with possibility to contain the large mineral content or even give the localization of new anomalies or mineral reserve. The study of ore reserve genesis is of great importance for the stages to obtain the mineral, from the prospection until the mineral mining. Fluid inclusions (FI) are fluid quantities which are imprison in the minerals during the formation process or some process where deformation occurs. The study of fluid inclusions, together with the petrographic mapping of the blades associated to the uranium para genesis of Lagoa Real, Brazil, are been used for a better comprehension of the uranium orogenesis. The main analysis techniques used in this context were the petrography and microthermometry. With the petrographic analysis fluid inclusions were observed and mapped in various minerals present in rocks associated to uranium mineralization, such as amphiboles, pyroxenes and grenades. The micro thermometric studies were only performed in the pyroxenes and the grenades due to the fluid inclusions types found in these minerals, and also the supposed relationships that those minerals have with uranium mineralization at that region. (author)

  12. Geochemistry and morphology of mineral components from the fossil gold and uranium placers of the Witwatersand

    International Nuclear Information System (INIS)

    Hallbauer, D.K.

    1981-01-01

    Using the hydrofluoric-acid leaching technique to obtain heavy-mineral grains intact from Witwatersrand conglomerates and the scanning electron microscope with microanalyzer attachment, the technique of morphological microscopy was applied to observe the three dimensions of the grains and to study their composition. In combination with stereo x-ray radiography of rock slabs and the application of various geochemical techniques, this afforded new information on the processes that led to the formation of Precambrian placer deposits. Fossilized organisms could consequently be recognized from the morphology of their carbonaceous remains, permitting their role in the concentration of gold and uranium to be explained. Studies of the morphology of different types of gold, pyrite, and other minerals have permitted conclusions on the origin and distribution of economically important minerals, as well as on the palaeoenvironment of Precambrian placers that were not possible with the classical methods of microscopy

  13. Weight of evidence analysis of lung cancer in Colorado Plateau uranium miners

    International Nuclear Information System (INIS)

    Groeer, P.G.; Wallace, P.W.; Pereira, A. de B.

    1989-01-01

    The authors use a Bayesian contingency table analysis to assess lung cancer in the Colorado plateau uranium miners. This population is studied by Whittemore, Hornung and BEIR-IV, but none of these includes the radiation dose from hard rock mining that about 38% of the miners have accumulated. The analysis uses 'weight of evidence' which Good applied to the analysis of lung cancer many years ago. The analysis indicates that only in those exposed for a long period and at high exposure rates is the weight of evidence positive with a coefficient of variation less than unity that radiation is associated with the lung cancers. The coefficient of variation is a criterion of the significance of the weight of evidence for the association of the radon exposure in the miners with lung cancer. In the subsequent discussion it is suggested that this approach is similar to the probability of causation, which it is not. (author)

  14. Application of EDRXF technique for the determination of uranium and thorium in beach sand minerals

    International Nuclear Information System (INIS)

    Natarajan, V.

    2013-01-01

    Zircon is a naturally occurring mineral and is available in many locations all over the world, This mineral usually contains U and Th at about 100-500 μg/g. Naturally occurring TiO 2 , containing minerals, rutile and ilmenite have small quantities of associated uranium. Natural rutile may contain upto 10% iron and upto 500 μg/g of uranium. Since the availability of rutile in nature is limited, ilmenite is used as raw material for producing synthetic rutile. In India, from monazite, thorium is separated by Indian Rare Earths Ltd., wherein uranium is a bye product. Since rutile is of importance to the gemstone markets, this is also produced from ilmenite ore. Roasting, reduction and leaching processes are important steps for removal of iron economically and efficiently from ilmenite ore during the production of synthetic rutile. We have developed a method to determine U and Th in zircon, using synthetic powder standards of ZrO 2 , containing U and Th in the range of 50 to 1000 μg/g. The limits of detection for U and Th were determined to be 200 and 100 μg/g respectively. Three zircon ore samples from different locations in India were analyzed for uranium and thorium using the method. The standardized method can be used for fast determination U and Th in zircon samples non-destructively with a precision of 10-20 %. Further another method was developed for the determination of uranium in rutile. Since iron and chromium are among the other impurities co-existing with U in rutile, these analytes have been included in the method. Synthetic standards containing U at 200-10,000 μg/g and Fe, Cr at 100- 2000 μg/g level were prepared and the spectrometer was calibrated using these standards. Two synthetic samples were analyzed using this method to evaluate the method for its reliability and reproducibility. In the present talk, details of these studies will be discussed. Moreover the work carried out on the determination of U/Th in sand minerals by other international

  15. Uranium fission track length distribution modelling for retracing chronothermometrical history of minerals

    International Nuclear Information System (INIS)

    Rebetez, M.

    1987-01-01

    Spontaneous fission of uranium 238 isotope contained in certain minerals creates damage zones called latent tracks, that can be etched chemically. The observation of these etched tracks and the measurement of their characteristics using an optical microscope are the basis of several applications in the domain of the earth sciences. First, the determination of their densities permits dating a mineral and establishing uranium mapping of rocks. Second, the measurement of their lengths can be a good source of information for retracing the thermal and tectonic history of the sample. The study of the partial annealing of tracks in apatite appears to be the ideal indicator for the evaluation of petroleum potential of a sedimentary basin. To allow the development of this application, it is necessary to devise a theoretical model of track length distributions. The model which is proposed takes into account the most realistic hypotheses concerning registration, etching and observation of tracks. The characteristics of surface tracks (projected lengths, depths, inclination angles, real lengths) and confined tracks (Track IN Track and Track IN Cleavage) are calculated. Surface tracks and confined tracks are perfectly complementary for chrono-thermometric interpretation of complex geological histories. The method is applied to the case of two samples with different tectonic history, issued from the cretaceous alcalin magmatism from the Pyrenees (Bilbao, Spain). A graphic method of distribution deconvolution is proposed. Finally, the uranium migration, depending on the hydrothermal alteration, is studied on the granite from Auriat (France) [fr

  16. Estimation of the reactive mineral surface area during CO2-rich fluid-rock interaction: the influence of neogenic phases

    Science.gov (United States)

    Scislewski, A.; Zuddas, P.

    2010-12-01

    with CO2-rich fluids, decreasing the effective reactive surface area. Predictive models of CO2 sequestration under geological conditions should take into account the inhibiting role of surface coating formation. The CO2 rich fluid-rock interactions may also have significant consequences on metal mobilization. Our results indicated that the formation of stable carbonate complexes enhances the solubility of uranium minerals of both albitite and granite, facilitating the U(IV) oxidation, and limiting the extent of uranium adsorption onto particles in oxidized waters. This clearly produces an increase of the uranium mobility with significant consequences for the environment.

  17. Uranium

    International Nuclear Information System (INIS)

    Gabelman, J.W.; Chenoweth, W.L.; Ingerson, E.

    1981-01-01

    The uranium production industry is well into its third recession during the nuclear era (since 1945). Exploration is drastically curtailed, and many staffs are being reduced. Historical market price production trends are discussed. A total of 3.07 million acres of land was acquired for exploration; drastic decrease. Surface drilling footage was reduced sharply; an estimated 250 drill rigs were used by the uranium industry during 1980. Land acquisition costs increased 8%. The domestic reserve changes are detailed by cause: exploration, re-evaluation, or production. Two significant discoveries of deposits were made in Mohave County, Arizona. Uranium production during 1980 was 21,850 short tons U 3 O 8 ; an increase of 17% from 1979. Domestic and foreign exploration highlights were given. Major producing areas for the US are San Juan basin, Wyoming basins, Texas coastal plain, Paradox basin, northeastern Washington, Henry Mountains, Utah, central Colorado, and the McDermitt caldera in Nevada and Oregon. 3 figures, 8 tables

  18. Genetic Affiliation of Gold and Uranium Mineralization in El-Missikat Granite, Central Eastern Desert, Egypt

    International Nuclear Information System (INIS)

    Ammar, F.A.; Omar, S.A.M.; El Sawey, El.H.

    2016-01-01

    Gabal El-Missikat granitic pluton is affected by two fault systems trending NW-SE (the oldest) and ENE-WSW directions. It is one of the uranium occurrences in the Eastern Desert of Egypt. The northwestern margins of El-Missikat pluton, along its contact with the gneissose quartz diorite, are dissected by numerous reactivated fractured shear zones running generally ENE-WSW to NE-SW and dipping about 60°-70° to SE. Many white (oldest), smoky or black and jasperoid (youngest) silica veinlets fill the fractures of these shear zones. These veins are of irregular shape and variable thickness ranging from few centimeters to about three meters. They are chiefly affected by silicification, sericitization, hematitization , kaolinization and hydrothermal alterations processes. The smoky black veins are hosting secondary uranium and fluorite-, sulphide-gold mineralizations. Polished surface studies, ICP-ES and Atomic Absorption as well as Scanning Electron Microscope measurements recorded galena, pyrite chalcopyrite, sphalerite and molybdenite in the black and jasperoid mineralized veins. Gold associated with ore mineral assemblage as pyrite, chalcopyrite, sphalerite, galena, sheelite and iron oxides. The identified sulphide minerals not bearing gold are recorded. Gold are relatively coarse-grained, massive and metallic yellow or stretched bronze colored particles. The recorded secondary U minerals associates the sulphide gold-mineralization in the black and jasperoid silica veins. Regarding the mobility of both uranium and gold, U 4+ mobilized in oxidizing medium and migrate and transport as U 6+ , then deposited later as U 4+ when the medium changes to be reducing characterized by high /O 2 . On contrary, gold mobilized when the medium is complex AuCl 3- ion bearing. Consequently, El- Missikat granitic pluton affected by oxidizing Au and Cl 3- bearing high temperature hydrothermal solutions that leached U 4+ , W and Mo from the granitic mass as U 6 + , later decrease of

  19. A non-pedological hypothesis for the processes of uranium mineralization in calcrete

    International Nuclear Information System (INIS)

    Briot, P.; Fuchs, Y.

    1984-01-01

    The non-pedological hypothesis presented for the origin of the uraniferous calcrete deposits in Western Australia is based on the premise that alluvial and calcareous lacustrine sediments were initially formed during earlier wet periods, evidence for which has been found in the fossil records. These were followed by subsequent epigenetic alteration accompanied by the precipitation of uranium mineralization during drier semi-arid periods. Typical examples of the processes involved were found in the Yeelirrie uranium deposit. During the latter semi-arid period, the limited surface flow which consisted of periodic flash flood conditions probably contributed marginally to the recharge of the groundwater, and consequently, semi-stagnant groundwater conditions evolved, particularly where the hydraulic gradient was extremely small, for example, for the Yeelirrie channel it is approximately 0.001. In addition, ponding of water behind a natural barrier caused the groundwater to evolve along the following geochemical sequence: mild alkalinity, weak oxidizing conditions, and oversaturation in dissolved elements. These hydrological and hydrogeochemical conditions induced the epigenetic alteration of the palustral/lacustrine limestone, bringing about dolomite neogenesis and the precipitation of carnotite. The source of the uranium in the calcretes and the groundwater of the Yeelirrie channel is considered to be the weathered outcrops of the breakaways along its margins. The genetic hypothesis proposed in this paper, although somewhat different from those described previously and elsewhere in this volume, could be applied to the other uranium-bearing calcretes in Mauritania, Namibia, and Somalia

  20. Risk due assessment of the intake of uranium isotopes in mineral spring waters

    International Nuclear Information System (INIS)

    Camargo, Iara M.C.; Mazzilli, Barbara

    1998-01-01

    To complement the data of a previous research concerning the evaluation of the lifetime risk of radiation-induced cancer due to the injection of 226 Ra, 228 Ra and 222 Rn in mineral spring waters from a natural highly radioactive region of Brazil. The study was performed to evaluate the lifetime risk of radiation-induced cancer due to the ingestion of 238 U and 234 U in the same spring waters. It is assumed that the risk coefficient for natural U isotopes is the same as for the 226 Ra-induced bone sarcomas and that the equilibrium for skeletal content is 25 times the daily ingestion of 226 Ra, but 11 times the daily ingestion of long-lived uranium isotopes. Waters samples were collected seasonally over a period of one year at all the spring sites used by the local population of Aguas da Prata, Sao Paulo State, Brazil. Concentrations ranging from 2.0 to 28.4 mBq/L and from 4.7 to 143 mBq/L were observed for 238 U and 234 U, respectively. Based upon the measured concentrations the lifetime risk due to the ingestion of uranium isotopes was estimated. A total of 0.3 uranium-induced cancers for 10 6 exposed persons was predicted, suggesting that chronic ingestion of uranium at the levels observed at these springs will result in an incremental increase of fatal cancers of 0.1%. (author)

  1. Rock geochemistry related to mineralization processes in geothermal areas

    Science.gov (United States)

    Kausar, A. Al; Indarto, S.; Setiawan, I.

    2018-02-01

    Abundant geothermal systems in Indonesia suggest high heat and mass transfer associated with recent or paleovolcanic arcs. In the active geothermal system, the upflow of mixed fluid between late stage hydrothermal and meteoric water might contain mass of minerals associated with epithermal mineralisation process as exemplified at Lihir gold mine in Papua New Guinea. In Indonesia, there is a lack of study related to the precious metals occurrence within active geothermal area. Therefore, in this paper, we investigate the possibility of mineralization process in active geothermal area of Guci, Central Java by using geochemical analysis. There are a lot of conducted geochemical analysis of water, soil and gas by mapping the temperature, pH, Hg and CO2 distribution, and estimating subsurface temperature based on geothermometry approach. Then we also apply rock geochemistry to find minerals that indicate the presence of mineralization. The result from selected geothermal area shows the presence of pyrite and chalcopyrite minerals on the laharic breccias at Kali Putih, Sudikampir. Mineralization is formed within host rock and the veins are associated with gold polymetallic mineralization.

  2. Mineral resources of the Desolation Canyon, Turtle Canyon, and Floy Canyon Wilderness Study Areas, Carbon Emery, and Grand counties, Utah

    International Nuclear Information System (INIS)

    Cashion, W.B.; Kilburn, J.E.; Barton, H.N.; Kelley, K.D.; Kulik, D.M.; McDonnell, J.R.

    1990-09-01

    This paper reports on the Desolation Canyon, Turtle Canyon, and Floy Canyon Wilderness Study Areas which include 242,000 acres, 33,690 acres, and 23,140 acres. Coal deposits underlie all three study areas. Coal zones in the Blackhawk and Nelsen formations have identified bituminous coal resources of 22 million short tons in the Desolation Canyon Study Area, 6.3 million short tons in the Turtle Canyon Study Area, and 45 million short tons in the Floy Canyon Study Area. In-place inferred oil shale resources are estimated to contain 60 million barrels in the northern part of the Desolation Canyon area. Minor occurrences of uranium have been found in the southeastern part of the Desolation Canyon area and in the western part of the Floy Canyon area. Mineral resource potential for the study areas is estimated to be for coal, high for all areas, for oil and gas, high for the northern tract of the Desolation Canyon area and moderate for all other tracts, for bituminous sandstone, high for the northern part of the Desolation Canyon area, and low for all other tracts, for oil shale, low in all areas, for uranium, moderate for the Floy Canyon area and the southeastern part of the Desolation Canyon area and low for the remainder of the areas, for metals other than uranium, bentonite, zeolites, and geothermal energy, low in all areas, and for coal-bed methane unknown in all three areas

  3. Potentiation of cigarette smoking and radiation: evidence from a sputum cytology survey among uranium miners and controls

    International Nuclear Information System (INIS)

    Band, P.; Feldstein, M.; Saccomanno, G.; Watson, L.; King, G.

    1980-01-01

    To assess the effect of cigarette smoking and of exposure to radon daughters, a prospective survey consisting of periodic sputum cytology evaluation was initiated among 249 underground uranium miners and 123 male controls. Sputum cytology specimens showing moderate atypia, marked atypia, or cancer cells were classified as abnormal. As compared to control smokers, miners who smoke had a significantly higher incidence of abnormal cytology (P = 0.025). For miner smokers, the observed frequencies of abnormal cytology were linearly related to cumulative exposure to radon daughters and to the number of years of uranium mining. A statistical model relating the probability of abnormal cytology to the risk factors was investigated using a binary logistic regression. The estimated frequency of abnormal cytology was significantly dependent, for controls, on the duration of cigarette smoking, and for miners, on the duration of cigarette smoking and of uranium mining

  4. Research on supplying potential of uranium source from rocks in western provenance area of Hailaer basin

    International Nuclear Information System (INIS)

    Xia Yuliang; Liu Hanbin; Chinese Academy of Geological Sciences, Beijing

    2006-01-01

    Using U-Pb isotope composition evolution, this paper expounds the initial uranium content in volcanic rocks of provenance area of Xihulitu basin and in granites of provenance area of Kelulun sag, western Hailaer basin. The initial uranium content (U 0 ) in volcanic rocks of provenance area is higher, the average initial uranium content of volcanic rocks is 10.061 x 10 -6 , the average uranium variation coefficient (ΔU) is -49.57%; the average initial uranium content of granites is 18.381 x 10 -6 , the average uranium variation coefficient (ΔU) is -80%. The results indicate that rocks in provenance area could provide the pre-enrichment of uranium in deposited sandstone. U-Ra equilibrium coefficients of rocks indicate that there is obvious U-Ra disequilibrium phenomenon in volcanic rocks, and the time when granites provided uranium source occurred 16000 a ago. (authors)

  5. Introduction to uranium geology of the Kaycee area in Johnson county, Wyoming

    International Nuclear Information System (INIS)

    Li Wuwei

    2004-01-01

    The geology of the Kaycee uranium deposit is introduced in three aspects: regional setting, stratigraphy and structure. At the same time, uranium and vanadium mineralization of significant economic potential have been reported in the sandstones and conglomerates from Paleocene to Eocene period in the eastern and northeastern part of Kaycee, Wyoming. (authors)

  6. Hydrogeochemical and stream-sediment reconnaissance, orientation study, Ouachita Mountain area, Arkansas. National Uranium Resource Evaluation Program

    International Nuclear Information System (INIS)

    Steele, K.F.

    1982-08-01

    A hydrogeochemical ground water orientation study was conducted in the multi-mineralized area of the Ouachita Mountains, Arkansas in order to evaluate the usefulness of ground water as a sampling medium for uranium exploration in similar areas. Ninety-three springs and nine wells were sampled in Clark, Garland, Hot Springs, Howard, Montgomery, Pike, Polk, and Sevier Counties. Manganese, barite, celestite, cinnabar, stibnite, copper, lead, and zinc are present. The following parameters were determined: pH, conductivity, alkalinity, U, Br, Cl, F, He, Mn, Na, V, Al, Dy, NO 3 , NH 3 , SO 4 , and PO 4 . The minerals appear to significantly affect the chemistry of the ground water. This report is issued in draft form, without detailed technical and copy editing. This was done to make the report available to the public before the end of the National Uranium Resource Evaluation

  7. Radiation-induced defects in clay minerals, markers of the mobility of the uranium in solution in the unconformity-type uranium deposits

    International Nuclear Information System (INIS)

    Morichon, E.

    2008-10-01

    This study presents the works driven on three groups of clay minerals (kaolins, illite, sudoite (di-tri-octahedral chlorites)) characteristics of the alteration halos surrounding unconformity-type uranium deposits, in order to reveal uranium paleo-circulations in the intra-cratonic meso-Proterozoic basins (1,2 - 1,6 Ga). Thanks to Electron Paramagnetic Resonance Spectroscopy (EPR), we were able to highlight the persistence of structural defects in kaolin-group minerals contemporaneous of the basin diagenesis, and demonstrate the existence of relatively stable defects in illites and sudoites contemporaneous of the uranium deposits setting. Thus, the main defect in illite (Ai centre) and the main defect in sudoite (As centre) are characterized by their g components such as, respectively, gt = 2,003 et g// = 2,051 for illite and gt = 2,008 et g// = 2,051 for sudoite. As the main defect in kaolins (kaolinite/dickite), the main defects in illite and sudoite are perpendicularly oriented according to the (ab) plane, on the tetrahedral Si-O bound. However, their thermal stabilities seem different. The observation of samples from different zones (background, anomal or mineralized) of the Athabasca basin (Canada) allowed to identify a parallel evolution between actual defects concentration measured in the different clay minerals and the proximity of the mineralisation zones. Consequently, clays minerals can be considered as potential plotters of zones where uranium-rich solutions have circulated. (author)

  8. A rapid in situ method for determining the ages of uranium oxide minerals: Evolution of the Cigar Lake deposit, Athabasca Basin

    International Nuclear Information System (INIS)

    Fayek, M.; Harrison, T.M.; Grove, M.; Coath, C.D.

    2000-01-01

    The authors present a rapid and accurate technique for making in situ U-Pb isotopic measurements of uranium oxide minerals that utilizes both electron and ion microprobes. U and Pb concentrations are determined using an electron microprobe, whereas the isotopic composition of Pb for the same area is measured using a high-resolution ion microprobe. The advantages of this approach are: mineral separation and chemical digestion are unnecessary; homogeneous uranium oxide standards, which are difficult to obtain, are not required; and precise and accurate U-Pb ages on ∼10 microm spots can be obtained in a matter of hours. The authors have applied their method to study the distribution of U-Pb ages in complexly intergrown uranium oxides from the unconformity-type Cigar Lake uranium deposit, Saskatchewan, Canada. In situ U-Pb results from early formed uraninite define a well-correlated array on concordia with upper and lower intercepts of 1,467 ± 63 Ma and 443 ± 96 Ma (±1σ), respectively. The 1,467 Ma age is interpreted as the minimum age of mineralization and is consistent with the age of clay-mineral alteration (approximately1477 Ma) and magnetization of diagenetic hematite (1,650 to 1,450 Ma) that is associated with these unconformity-type uranium deposits and early diagenesis of the Athabasca Basin sediments. In situ U-Pb isotopic analysis of uraninite and coffinite can document the Pb*/U heterogeneities that can occur on a scale of 15 to 30 microm, thus providing relatively accurate information regarding the timing of fluid interactions associated with the evolution of these deposits

  9. Features and uranium mineralization of Malou thrust nappe structure in Rencha basin of northeast Guangdong

    International Nuclear Information System (INIS)

    Song Shizhu; Zhao Wei; Zheng Mingliang; Chen Zhuhai

    2010-01-01

    Rencha basin was a Cenozoic volcanic fault basin (K 2 -E). Due to strong and frequent tectonic-magmatic activities, especially the late volcanic activities in the region, the acidic volcanic rock was formed which is the host rocks of uranium-molybdenum polymetallic deposit. Malou structural belt is a east-west trending and a long-term tectonic-magmatic activities belt, and is also a linear structure of volcanic eruption. Through recent exploration and study, Malou structure (F 1 )was found to be a thrust nappe structure. In the early stage of evolution, the structure controled the formation of Rencha basin and rock distribution, in the later, it controled the formation of uranium mineralization. Because farely rich orebody has been discovered in some deep part of the structure, large and richer orebody can be predicted in the depth of 500-1500 m. (authors)

  10. Uranium mineral - groundwater equilibrium at the Palmottu natural analogue study site, Finland

    International Nuclear Information System (INIS)

    Ahonen, L.; Ruskeeniemi, T.; Blomqvist, R.; Ervanne, H.; Jaakkola, T.

    1993-01-01

    The redox-potential, pH, chemical composition of fracture waters, and uraninite alteration associated with the Palmottu uranium mineralization (a natural analogue study site for radioactive waste disposal in southwestern Finland), have been studied. The data have been interpreted by means of thermodynamic calculations. The results indicate equilibrium between uraninite, ferric hydroxide and groundwater in the bedrock of the study site. Partially oxidized uraninite (UO 2 .33) and ferric hydroxide are in equilibrium with fresh, slightly acidic and oxidized water type, while primary uraninite is stable with deeper waters that have a higher pH and lower Eh. Measured Eh-pH values of groundwater cluster within a relatively narrow range indicating buffering by heterogenous redox-processes. A good consistency between measured Eh and analyzed uranium oxidation states was observed

  11. Radon exposure and mortality among the French cohort of uranium miners: 1946-1999

    International Nuclear Information System (INIS)

    Vacquier, B.; Tirmarche, M.; Laurier, D.; Caer, S.; Quesne, B.

    2006-01-01

    Full text of publication follows: The French cohort of uranium miners aims at evaluating the mortality risk of miners exposed to low levels of radon and its decay products and to other occupational hazards. Its primary aim is the quantification of the relationship between cumulated radon exposure and the risk of lung cancer death. However this study also allows to analyse risks for causes of death other than lung cancer. We present a new analysis of the mortality based on an extended follow-up of the cohort to end of 1999. Materials and methods: The French cohort of uranium miners has been followed by the Institut de Radioprotection et de Surete Nucleaire (I.R.S.N.) since the 1980's, in collaboration with the Occupational Medical Service of Compagnie Generale des Matieres Nucleaires (Cogema). The cohort was recently enlarged and the follow-up extended up to 1999. It includes men employed as miners for at least 1 year since 1946 at the Commissariat a l Energie Atomique (Cea) or at the Cogema. Individual vital status was ascertained through a national database and causes of death were determined according to death certificates. For each miner, yearly radon exposures was reconstructed and expressed in working level month (W.L.M.). Risk of death was estimated relatively to external reference rates from the general French male population. The classical method of standardized mortality ratios (S.M.R.s) was used to adjust for age and calendar year. Exposure-risk relationships have been estimated by Poisson regression, using a linear excess relative risk (E.R.R.) model with a lag time of 5 years. Results: The cohort comprises 5,098 miners. The mean duration of follow -up is 30.1 years (total of 153,272 person-years). The number of radon exposed miners is 4,134 with an average cumulative radon exposure of 36.5 W.L.M.. Miners lost to follow-up represent 1.4% of the cohort. A total of 1,471 deaths before age 85 is observed up to 1999. The analysis shows no excess for all

  12. Survey on basic data of risk estimation of lung cancer among non-uranium miners in China

    International Nuclear Information System (INIS)

    Fu Yinghua; Sun Quanfu; Du Weixia; Lei Suwen; Lei Shujie; Li Xiaoying; Zhang Shouzhi; Qian Yekan; Su Xu

    2009-01-01

    Objective: To investigate the basic data of risk estimation of lung cancer among non-uranium miners in China. Methods: 2836 workers from 24 mines in 9 provinces/regions were face-to-face interviewed to collect information including age at exposure,exposure duration, cigarette smoking among others. Results: Age of the investigated non-uranium miners ranged from 17 to 72 (36.9 ± 8.0) years. The miners received low and poor education, 3% of them were illiterate, 58% with primary and middle school education, only 7% with junior college and higher education. Seventy-five percent of the uranium miners are migrant rural workers. Ethnic minority miners accoungted for 16% of all the investigated miners. Among the migrant rural workers age at initial exposure was estimated to be 29.6 ± 8.0 years. By the time of the investigation, 46.7% of the miners had worked in the mine for five years and longer, working years in the mine was 6.7 ± 6.8 years with a median of 4.1 years. 3.4% of the non-uranium miners began the initial radon exposure in mines before their 18 years of old. 17.5% of the investigated miners reported working more than 8 h every working day. Among the males, 58.0% were current smokers with a median of 16 cigarettes per day. Age to begin the cigarette smoking was 20 years on average. Current smoking rate was age-dependent, the rate as high as 69.2% for the males aged 15-19 years. Current smoking rate was significantly statistically lower in coal mines than that in other mines, 49.0% vs 62.5%. Compared with other miners, more frequent mechanical ventilations were reported by coal miners, Conclusions: In China non-uranium mines, 75% were migrant rural workers, by the time of the investigation about half of them had worked in the mines for at least five years. Non-uranium miners began their mining at 30 years on average, with a very small percentage of 3%, exposed to the mining radon before their 18 years. Current cigarette smoking rate in non-uranium male miners

  13. Selenide Mineralization in the Příbram Uranium and Base-Metal District (Czech Republic

    Directory of Open Access Journals (Sweden)

    Pavel Škácha

    2017-06-01

    Full Text Available Selenium mineralization in the Příbram uranium and base-metal district (Central Bohemia, Czech Republic bound to uraninite occurrences in calcite hydrothermal veins is extremely diverse. The selenides antimonselite, athabascaite, bellidoite, berzelianite, brodtkorbite, bukovite, bytízite, cadmoselite, chaméanite, clausthalite, crookesite, dzharkenite, eskebornite, eucairite, ferroselite, giraudite, hakite, klockmannite, naumannite, permingeatite, příbramite, sabatierite, tiemannite, and umangite were found here, including two new mineral phases: Hg-Cu-Sb and Cu-As selenides. Those selenides—and in some cases their sulphidic equivalents—are characterized using wavelength-dispersive spectroscopy, reflected light, powder X-ray diffraction, single crystal X-ray diffraction, Raman spectroscopy, and electron backscatter diffraction. The selenide mineralization in the Příbram uranium district is bound to the border of the carbonate-uraninite and subsequent carbonate-sulphidic stages. Selenides crystallized there at temperatures near 100 °C in the neutral-to-weakly-alkaline environment from solutions with high oxygen fugacity and a high Se2/S2 fugacity ratio.

  14. Uranium-bearing and associated minerals in their geochemical and sedimentological context, Elliot Lake, Ontario

    International Nuclear Information System (INIS)

    Theis, N.J.

    1979-01-01

    The depositional energy environment of the Rio Algom-Denison ore reef was investigated on a regional scale using several parameters including pebble size. Regional trends of decreasing pebble size coincide with the regional direction of sediment transport. Pebble size was also used to characterize the depositional energy environment at the sample level. Quartz-pebble size and pyrite-grain size as determined from the same samples have a correlation coefficient of 0.93 which indicates that the coarse granular pyrite is detrital. Bulk chemical analyses of selected elements (U, Th, Pb, Ti, Ce, La, Y and Zr) which were chosen to reflect specific minerals (uraninite, brannerite, monazite and zircon), showed strong correlation with quartz-pebble size of the respective samples. Electron microprobe analyses of uraninite and brannerite are reported. The uraninites have typical pegmatitic compositions. Several types of brannerite are described; the conclusion reached is that although some brannerite may be detrital, most of it formed by adsorption of uranium onto titania collectors. Redistribution of some of the uranium has not changed the placer nature of the ore reef. Genesis of individual minerals (pyrite, uraninite, brannerite, zircon and monazite) is discussed. It is concluded that the mineralogy and its geochemical expression have been controlled by processes of fluvial deposition. As a result of the regional patterns in depositional environment, the ore reef shows a broad mineralogical zoning. Fluctuations in depositional energy have also produced lithologically related mineral zoning on a smaller scale. (author)

  15. Uranium miner lung cancer study. Progress report, July 1, 1976--July 1, 1977

    International Nuclear Information System (INIS)

    Saccomanno, G.

    1977-01-01

    This study was initiated in 1957 by the U.S. Public Health and many facets of this project are reaching final objectives. Many new studies have developed in the course of this study and will continue. The projects supported by the Energy Research and Development Administration are of utmost importance and consist of: collection of material from uranium miners known to have cancer of the lung into a tumor registry; manual on pulmonary cytology; regression study of sputum cytological findings in uranium miners who showed marked atypical squamous cell metaplasia and have quit smoking cigarettes, mining, or both; continuation of sputum collection and collection of lungs from deceased miners; sensory development for localization of carcinoma in situ of the lung; and lung histology program. Since we have examined approximately 77,000 sputum samples over the last 20 years in cases that showed normal cytology at the inception of the study and some subsequently developed carcinoma of the lung, we have an accumulation of material that is worthy of study and presentation

  16. Uranium miner lung cancer study. Progress report for period, July 1, 1977--July 1 1978

    International Nuclear Information System (INIS)

    Saccomanno, G.

    1978-01-01

    This study was initiated in 1957 by the U.S. Public Health, and many facets of this project are reaching final objectives. Many new studies have developed in the course of this study and will continue. The projects supported by The Department of Energy during the past year are of utmost importance and consist of: (a) collection of material from uranium miners known to have cancer of the lung into a tumor registry; (b) completion and publication of the Manual on Pulmonary Cytology; (c) regression study of sputum cytological findings in uranium miners who showed marked atypical squamous cell metaplasia and have quit smoking cigarettes, mining, or both; (d) continuation of sputum collection and collection of lungs from deceased miners; (e) sensory development for localization of carcinoma in situ of the lung; and (f) lung histology program. Since we have examined approximately 80,000 sputum samples the last 21 years in cases that showed normal cytology at the inception of the study and some subsequently developed carcinoma of the lung, we have an accumulation of material that is worthy of study and presentation. In addition, we continue to add new knowledge to the art of diagnostic pulmonary cytology. This is a relatively new field, and our contributions resulting from these studies have added much to this new diagnostic tool

  17. Flora and fauna of Thummalapalle uranium mining area

    International Nuclear Information System (INIS)

    Pullaiah, T.

    2012-01-01

    Thummalapalle Uranium Mining site is located near Thummalapalle village in Vemula mandal, Kadapa district, Andhra Pradesh. Flora and faunal study was carried out in the area 30 km radius from the mining site, covering an area of 2828 Km 2 , during 2009-2012. The geographical coordinates of the centre point are NL 14° 19 min 59.3 sec and EL 78° 15 min 18.2 sec. Altitude of the study area ranges from 198 to 875 m above MSL. Scrub type of forest is dominant in the core zone followed by waste lands and agriculture lands. Buffer zone I and II also are dominated by scrub forest except a small patch at the North West corner where degraded dry deciduous forest is seen. A total of 859 plant taxa comprising 474 genera and 120 families were identified. Of the 859 taxa, 768 are Angiosperms, 9 Pteridophytes, 25 Bryophytes, 44 Algae and 14 Lichens. A total of 49 endemic taxa (2 strictly Andhra Pradesh, 5 to Eastern Ghats and 43 from Peninsular India) have been recorded. Albizia thompsonii and Ceropegia spiralis, rare taxa, have been recorded in the study area and these two species are distributed throughout peninsular India. Quadrat analysis revealed that Heteropogon contortus, Catunaregum spinosa, Asparagus racemosus and Croton scabiosus are the dominant in herbs, shrubs, climbers and trees respectively. A total of 419 animal species belonging to 358 genera and 178 families have been recorded in the Thummalapalle Uranium Mining Area. A total of nine endemic animal species have been recorded. Golden Gecko (Calodactylodes aureus) which is endemic to Eastern Ghats is recorded in Buffer zone 1. Fejervarya caperata is a new record to Andhra Pradesh, which was earlier reported from Western Ghats. An analysis of the flora reveals interesting features. Orchidaceae which is the second largest family in India is only one species represented in Thummalapalle Uranium Mining Area as it is evident that the growth and development of Orchids in open dry deciduous and scrub forests are

  18. What are the health costs of uranium mining? A case study of miners in Grants, New Mexico

    Science.gov (United States)

    Jones, Benjamin A

    2014-01-01

    Background: Uranium mining is associated with lung cancer and other health problems among miners. Health impacts are related with miner exposure to radon gas progeny. Objectives: This study estimates the health costs of excess lung cancer mortality among uranium miners in the largest uranium-producing district in the USA, centered in Grants, New Mexico. Methods: Lung cancer mortality rates on miners were used to estimate excess mortality and years of life lost (YLL) among the miner population in Grants from 1955 to 2005. A cost analysis was performed to estimate direct (medical) and indirect (premature mortality) health costs. Results: Total health costs ranged from $2.2 million to $7.7 million per excess death. This amounts to between $22.4 million and $165.8 million in annual health costs over the 1955–1990 mining period. Annual exposure-related lung cancer mortality was estimated at 2185.4 miners per 100 000, with a range of 1419.8–2974.3 per 100 000. Conclusions: Given renewed interest in uranium worldwide, results suggest a re-evaluation of radon exposure standards and inclusion of miner long-term health into mining planning decisions. PMID:25224806

  19. The distribution of E-centres concentration in the minerals of the wall-rocks of uranium deposit

    International Nuclear Information System (INIS)

    Kislyakov, Ya.M.; Moiseev, B.M.; Rakov, L.T.; Kulagin, Eh.G.

    1975-01-01

    Electron paramagnetic resonance was used to investigate the distribution of electron-hole centres caused by natural radioactive irradiation in terrigenous arcosic rocks and their principal mineral components (quartz-feldspar concretions, white and smoky quartz, feldspars). The relationship between concentrations of E-centres and the uranium content of the rocks reflects the genetic features of the uranium mineralization. Taking one specific deposit as an example, the author shows the proportional dependence between uranium content and E-centre concentration. The dependence reflects the practically simultraneous formation of the main mass of epigenetic mineralization. The hypothesis that older (syngenetic) ore deposits may have existed was not confirmed. Despite the long interval between sedimentary accumulation end epigenesis, no significant surplus concentrations of E-centres were found in epigenetic-metamorphic rocks. Anomalous concentrations of uranium and E-centres are caused by uranium migration during later epigenetic processes superimposed on the mesozoic ore-controlling zonality. One result of this migration is the formation in limonitized rocks of ''augen'' ores for which low concentrations of paramagnetic centres are typical. For the study of the distribution of E-centres in rocks from uranium deposits, it is possible to use polymineral mixtures. For the proper interpratation of the data obtained, however, account must be taken of the sensitivity to irradiation of the various mineral components, particularly the various forms of quartz, which is the principal natural dosimeter. (E.G.)

  20. Frontier areas and exploration techniques. Frontier uranium exploration in the South-Central United States

    International Nuclear Information System (INIS)

    Campbell, M.D.; Biddle, K.T.

    1977-01-01

    Selected areas of the South-Central United States outside the known U trends of South Texas have a largely untested potential for the occurrence of significant U mineralization. These areas, underlain by Tertiary and older sediments, include parts of Texas, Oklahoma, Arkansas, Louisiana, Mississippi and Alabama. The commonly accepted criteria employed in U exploration are applicable to these frontier areas but special consideration must also be given to the atypical geologic aspects of such areas as they may apply to relatively unique types of U mineralization or to the development of special exploration criteria for common types of roll-front and fault-and dome-related uranium mineralization. The procedures used in evaluating frontier areas should be based on comprehensive evaluations involving: (1) location and analysis of potential source rocks (e.g., intrusive igneous rocks, bentonitic sediments, unique complexes, etc.); (2) definition of regional variations in the potential host sediments (e.g. marginal marine to nonmarine environments of deposition); (3) review of all available radiometric data in Tertiary or older rocks; (4) local groundwater sampling; (5) widely spaced reconnaissance (or stratigraphic) drilling, coring and borehole geophysical logging to define favorable sedimentary facies and to establish the specific lithologic character of the sediments; and (6) detailed petrographic evaluation of all available samples to define the environment of deposition and diagenetic history of ''favorable'' sediments. If procedures produce favorable results, an expanded exploration program is justified. Depths up to 3,000 feet should be anticipated if up-dip information is favorable. Selected areas are discussed that have: (1) favorable source and host rocks;(2) favorable age; (3) favorable regional and local structure; and (4) radiometric characteristics favorable for U mineralization of potentially economic grade and reserves in the areas

  1. Uranium mineralization and unconformities: how do they correlate? - A look beyond the classic unconformity-type deposit model?

    Science.gov (United States)

    Markwitz, Vanessa; Porwal, Alok; Campbell McCuaig, T.; Kreuzer, Oliver P.

    2010-05-01

    Uranium deposits are usually classified based on the characteristics of their host rocks and geological environments (Dahlkamp, 1993; OECD/NEA Red Book and IAEA, 2000; Cuney, 2009). The traditional unconformity-related deposit types are the most economical deposits in the world, with the highest grades amongst all uranium deposit types. In order to predict undiscovered uranium deposits, there is a need to understand the spatial association of uranium mineralization with structures and unconformities. Hydrothermal uranium deposits develop by uranium enriched fluids from source rocks, transported along permeable pathways to their depositional environment. Unconformities are not only separating competent from incompetent sequences, but provide the physico-chemical gradient in the depositional environment. They acted as important fluid flow pathways for uranium to migrate not only for surface-derived oxygenated fluids, but also for high oxidized metamorphic and magmatic fluids, dominated by their geological environment in which the unconformities occur. We have carried out comprehensive empirical spatial analyses of various types of uranium deposits in Australia, and first results indicate that there is a strong spatial correlation between unconformities and uranium deposits, not only for traditional unconformity-related deposits but also for other styles. As a start we analysed uranium deposits in Queensland and in particular Proterozoic metasomatic-related deposits in the Mount Isa Inlier and Late Carboniferous to Early Permian volcanic-hosted uranium occurrences in Georgetown and Charters Towers Regions show strong spatial associations with contemporary and older unconformities. The Georgetown Inlier in northern Queensland consists of a diverse range of rocks, including Proterozoic and early Palaeozoic metamorphic rocks and granites and late Palaeozoic volcanic rocks and related granites. Uranium-molybdenum (+/- fluorine) mineralization in the Georgetown inlier

  2. Lung cancer mortality among U.S. uranium miners: a reappraisal

    International Nuclear Information System (INIS)

    Whittemore, A.S.; McMillan, A.

    1983-01-01

    This report examines lung cancer mortality among a cohort of white underground uranium miners in the Colorado plateau and is based on mortality follow-up through December 31, 1977. The analytic methods represent a miner's annual age-specific lung cancer mortality rate as the (unspecified) rate among nonsmoking men born at the same time and with no mining history, multiplied by the relative risk factor R. This factor depends on the miner's total exposures to radon daughters [in working level months (WLM) and to cigarettes (in packs), accumulated from start of exposure until 10 years before his current age. Among those examined, the relative risk function giving the highest likelihood of the data was R . (1 + 0.31 X 10(- 2 ) WLM)(1 + 0.51 X 10(- 3 ) packs). This multiplicative function specifies that ratios of mortality rates for miners versus nonminers with similar age and smoking characteristics do not depend on smoking status. By contrast, differences between miners' and nonminers' mortality rates are substantially higher for smokers than for nonsmokers. The data rejected (P . .01) several additive functions for R that specify relative risk as a sum of components due to radiation and to cigarette smoking. Cumulative exposures to both radiation and cigarettes gave better fits to the data than did average annual exposure rates. Age at start of underground mining had no effect on risk, after controlling for age at lung cancer death, year of birth, and cumulative radiation and smoking exposures

  3. Uranium tailings research at the Canada Centre for Mineral and Energy Technology

    International Nuclear Information System (INIS)

    Haw, V.A.; Ritcey, G.M.; Skeaff, J.M.; Dave, N.; Silver, M.

    1983-01-01

    There are over 100 million tonnes of uranium tailings on the surface of Canada, an amount that is expected to increase threefold by the end of the century. Because of their potential hazard to the environment and man, the Canada Centre for Mineral and Energy Technology (CANMET) began a major programme ten years ago, to examine the problem of uranium tailings management. Work to date has shown that: (1) Vegetation of uranium tailings has been successful using seed mixtures planted on the tailings surface pre-treated by lime and fertilizer; (2) Lysimeter tests on uranium tailings have demonstrated that surface treatment and the presence or absence of bacteria have a marked effect on the flow and chemistry of seepage water; (3) Hydrogeochemical studies of the tailings have shown that acid conditions prevail in the upper zone of the tailings (i.e. above the water table) and that both radioactive and other toxic chemicals are concentrated near the bottom of the tailings; (4) Work has been done in co-operation with others on the precipitation and removal of 226 Ra from tailings water effluent by BaCl 2 . The purpose of this work is to improve control of the total radium content of water discharged to drainage systems by mechanical means. (5) Investigation into pre-concentrating the ore prior to acid leaching has demonstrated that virtually all the radionuclides and sulphides can be concentrated into a fraction amounting to from 30 to 40 per cent of the original feed, leaving a relatively clean tailing. The authors are still far from their objective of demonstrating, with reasonable assurance, effective methods for the long-term management of uranium tailings. An accelerated programme is outlined. (author)

  4. PHASE ANALYSES OF URANIUM-BEARING MINERALS FROM THE HIGH GRADE ORE, NOPAL I, PENA BLANCA, MEXICO

    Energy Technology Data Exchange (ETDEWEB)

    M. Ren; P. Goodell; A. Kelts; E.Y. Anthony; M. Fayek; C. Fan; C. Beshears

    2005-07-11

    The Nopal I uranium deposit is located in the Pena Blanca district, approximately 40 miles north of Chihuahua City, Mexico. The deposit was formed by hydrothermal processes within the fracture zone of welded silicic volcanic tuff. The ages of volcanic formations are between 35 to 44 m.y. and there was secondary silicification of most of the formations. After the formation of at least part of the uranium deposit, the ore body was uplifted above the water table and is presently exposed at the surface. Detailed petrographic characterization, electron microprobe backscatter electron (BSE) imagery, and selected x-ray maps for the samples from Nopal I high-grade ore document different uranium phases in the ore. There are at least two stages of uranium precipitation. A small amount of uraninite is encapsulated in silica. Hexavalent uranium may also have been a primary precipitant. The uranium phases were precipitated along cleavages of feldspars, and along fractures in the tuff. Energy dispersive spectrometer data and x-ray maps suggest that the major uranium phases are uranophane and weeksite. Substitutions of Ca and K occur in both phases, implying that conditions were variable during the mineralization/alteration process, and that compositions of the original minerals have a major influence on later stage alteration. Continued study is needed to fully characterize uranium behavior in these semi-arid to arid conditions.

  5. Uranyl phosphate mineral in Gapyeong area

    International Nuclear Information System (INIS)

    Chung, S.J.

    1980-01-01

    An uranyl phosphate crystal from Gapeong area is studied by means of single crystal x-ray diffraction and electron microscopic qualitative analysis of chemical contents. The crystal is identified as meta-ankoleite which has a unit cell of super structure with a=b=6.99 A, c=17.69 A and space group P4 2 22. There exists some indication in the total fluorescent spectrum of the sample that potassium may be partially substituted by calcium. The chemical formula of this meta-ankoleite may be expressed by Ksub(1-2x)Casub(x)(UO 2 PO 4 ) (H 2 O)sub(3-x). (Author)

  6. Investigation on Microbial Dissolution of Uranium (VI) from Autunite Mineral - 13421

    Energy Technology Data Exchange (ETDEWEB)

    Sepulveda, Paola; Katsenovich, Yelena; Lagos, Leonel [Applied Research Center, Florida International University. 10555 West Flagler St. Suite 2100, Miami Fl 33175 (United States)

    2013-07-01

    Precipitating autunite minerals by polyphosphate injection was identified as a feasible remediation strategy for sequestering uranium in contaminated groundwater and soil in situ at the Hanford Site. Autunite stability under vadose and saturated zone environmental conditions can help to determine the long-term effectiveness of this remediation strategy. The Arthrobacter bacteria are one of the most common groups in soils and are found in large numbers in Hanford soil as well as other subsurface environments contaminated with radionuclides. Ubiquitous in subsurface microbial communities, these bacteria can play a significant role in the dissolution of minerals and the formation of secondary minerals. The main objective of this investigation was to study the bacterial interactions under oxidizing conditions with uranium (VI); study the potential role of bicarbonate, which is an integral complexing ligand for U(VI) and a major ion in groundwater compositions; and present data from autunite dissolution experiments using Arthrobacter strain G968, a less U(VI)-tolerant strain. Sterile 100 mL glass mixed reactors served as the major bioreactor for initial experimentation. These autunite-containing bioreactors were injected with bacterial cells after the autunite equilibrated with the media solution amended with 0 mM, 3 mM 5 mM and 10 mM concentrations of bicarbonate. G968 Arthrobacter cells in the amount of 10{sup 6} cells/mL were injected into the reactors after 27 days, giving time for the autunite to reach steady state. Abiotic non-carbonate controls were kept without bacterial inoculation to provide a control for the biotic samples. Samples of the solution were analyzed for dissolved U(VI) by means of kinetic phosphorescence analyzer KPA-11 (Chemcheck Instruments, Richland, WA). Analysis showed that as [HCO{sub 3}{sup -}] increases, a diminishing trend on the effect of bacteria on autunite leaching is observed. Viability of cells was conducted after 24 hours of cell

  7. Investigation on Microbial Dissolution of Uranium (VI) from Autunite Mineral - 13421

    International Nuclear Information System (INIS)

    Sepulveda, Paola; Katsenovich, Yelena; Lagos, Leonel

    2013-01-01

    Precipitating autunite minerals by polyphosphate injection was identified as a feasible remediation strategy for sequestering uranium in contaminated groundwater and soil in situ at the Hanford Site. Autunite stability under vadose and saturated zone environmental conditions can help to determine the long-term effectiveness of this remediation strategy. The Arthrobacter bacteria are one of the most common groups in soils and are found in large numbers in Hanford soil as well as other subsurface environments contaminated with radionuclides. Ubiquitous in subsurface microbial communities, these bacteria can play a significant role in the dissolution of minerals and the formation of secondary minerals. The main objective of this investigation was to study the bacterial interactions under oxidizing conditions with uranium (VI); study the potential role of bicarbonate, which is an integral complexing ligand for U(VI) and a major ion in groundwater compositions; and present data from autunite dissolution experiments using Arthrobacter strain G968, a less U(VI)-tolerant strain. Sterile 100 mL glass mixed reactors served as the major bioreactor for initial experimentation. These autunite-containing bioreactors were injected with bacterial cells after the autunite equilibrated with the media solution amended with 0 mM, 3 mM 5 mM and 10 mM concentrations of bicarbonate. G968 Arthrobacter cells in the amount of 10 6 cells/mL were injected into the reactors after 27 days, giving time for the autunite to reach steady state. Abiotic non-carbonate controls were kept without bacterial inoculation to provide a control for the biotic samples. Samples of the solution were analyzed for dissolved U(VI) by means of kinetic phosphorescence analyzer KPA-11 (Chemcheck Instruments, Richland, WA). Analysis showed that as [HCO 3 - ] increases, a diminishing trend on the effect of bacteria on autunite leaching is observed. Viability of cells was conducted after 24 hours of cell incubation with

  8. Application of solution-mineral equilibrium chemistry to solution mining of uranium ores

    International Nuclear Information System (INIS)

    Riese, A.C.; Popp, C.J.

    1979-01-01

    The tests described were undertaken to determine the extent to leach solution-rock interactions with uranium-bearing ore obtained from the Mariano Lake mine. Leach solutions of an acidic (H/sub 2/O/sub 4/-sulfuric acid) and basic (NaHCO/sub 3/-sodium bicarbonate) nature were tested, in addition to a leach solution containing potassium chloride and sulfuric acid (KCl/H/sub 2/SO/sub 4/). The latter solution was chosen in an attempt to equilibrate the aqueous phase with the rock-forming silicate minerals and minimize adverse effects such as clay formation, porosity loss, and lixiviant loss. 29 refs

  9. Epidemiological studies of bronco-lung pathologies with miners of uranium deposits

    International Nuclear Information System (INIS)

    Gneusheva, G.I.

    2003-01-01

    Study of mortality from lung cancer among uranium-iron mine workers was conducted. In total 2582 persons having experience of work at underground condition not less 3 years with the known destiny were examined. During observation term (41 years) the 101 men were died from lung cancer. These mortality indexes have been compared with indexes of the rest male population of the city (control group). Obtained data showing that occupational lung cancer in the died miners common number makes up 74 %. Calculation of intensive mortality indexes in a diverse workers groups were carrying out and these indexes were compared with cumulative radiation expositions

  10. Uranium distributions in the mineral constituents of granitoid rocks and the associated pegmatites at Wadi Abu Had, north eastern desert, Egypt

    International Nuclear Information System (INIS)

    Nossair, L.M.; Moharem, A.F.; Abdel Warith, A.

    2007-01-01

    Wadi Abu Had area is located at the northern part of the Eastern Desert of Egypt. It covers about 55 km2 of the crystalline basement rocks stretching between latitudes 28o 15'- 28o 25' N and longitudes 32o 25' - 32o 35' E. Abu Had younger granites are fertile (uraniferous) granites as they possess U-contents greater than 11 ppm. Their associated pegmatites show higher U-contents than those of granitoid rocks and hosting secondary uranium minerals. Numerous unzoned and zoned pegmatite pockets are associated with the marginal parts of granodiorite and within younger granites. Zoned pegmatites are the most radioactive ones. They are composed of extremely coarse-grained milky quartz core, intermediate zone of mica and wall zone of feldspars. An alteration zone with secondary uranium minerals (uranophane and beta-uranophane) is found at the contact between quartz core and the intermediate zone.

  11. Ground magnetic exploration for radioactive minerals in Missikat area eastern desert of Egypt

    International Nuclear Information System (INIS)

    Sadek, H.S.; Soliman, S.A.; Abdelhady, H.M.; Elsayed, H.I.

    1988-01-01

    The airborne radiometric surveys and subsequent geological investigations proved the occurrence of uranium mineralization in jasperoid vein which cuts across the pink granites of Gebel El Missikat. The Missikat granites are intruded in older granodiorite and diorite exposures where the whole system is intersected by a system of faults and sheers. The relationship between the different structures and the origin of mineralization is not yet understood. The present study is the first step in a systematic approach of subsurface geophysical exploration for the mineral deposits. Ground magnetic survey was conducted along more than 25 lines across the jasperoid vein and separated at 50m while the magnetic measurements were taken at stations spaced 20m apart. The collected data has been reduced and analysed automatically using appropriate advanced software. The interpretation of the resultant magnetic contour map and profiles reveals the subsurface configuration of the different lithologic units in the area. Most of the granodiorites, exposed due west, are just roof pendants where they are underlain by the Missikat granite pluton. In addition it was possible to map the subsurface contacts between the granites and other geologic units beneath the Wadi Alluvium. The structural interpretation of magnetic data succeeded to distinguish additional fault lines and shear zones in the area. In this respect, a system of NE shears parallel to the mineralized vein, was distinguished by the associated weak magnetic anomalies. The anomalies resulting from the vein and shears suggest wider repetition of the mineralization and in addition, they can be used to distinguish the locations of increasing mineral potential in depth. Such locations are recommended for further geophysical exploration using more effective, however, expensive methods such as induced polarization (IP), self potential (SP) and miseala mass. The recommended exploration can be used for precise determination of the

  12. The sedimentology and uranium mineralization of the Klipbankskraal deposit north of Merweville, C.P

    International Nuclear Information System (INIS)

    Le Roux, J.P.

    1982-08-01

    A sedimentological study was conducted on the farm Klipbankskraal, north-west of Merweville. The orebody is located in the Poortjie Member at the base of the Teekloof Formation. The mineralised sandstone, S1, is a tabular lithosome deposited in an ephemeral, braided river environment. It consists of two major and several minor mesocycles, with the upper major cycle showing evidence of having inherited the drainage pattern of the lower mesocycle. The vector mean azimuth of the sequence as a whole is towards 059 degrees. The uranium is present as stacked, tabular lenses associated with permeable zones in the immediate vicinity of erosional inter-cycle contacts. Although no obvious relationship exists between the uranium and channels or bars, the distribution of plant material was controlled by the current velocities which also controlled the type of sedimentary structures. Uranium occurs preferentially in fissile-weathering (horizontal-bedded) sandstone and mud-pebble conglomerate, both permeable lithologies, and in mudstone or silt-stone. Uranium is genetically related to other elements such as Mn, Mo, Cu, Co and Pb, which must have been constituents of the ore fluid. Uraniferous granites in the source areas probaly supplied most of the uranium

  13. Orientated hemolysis of the red blood cells of miners from uranium mines

    International Nuclear Information System (INIS)

    Nosek, J.

    1975-06-01

    The method of orientated hemolysis was used to investigate the suspension of the washed red blood cells. The control group and the test group of miners were set up. It was found that the groups did not differ either in the number of the test tubes where the hemolysis took place, or in the number of the hemolytic zones. However they did differ in the average width of the hemolytic zones and their most probable location. A more frequent occurrence of wide hemolytic zones and their placement at the end of a row of 40 test tubes has been observed in the group of miners of the uranium mines. The reason for this was not elucidated but it was shown that the phenomenon can be simulated artifically by adding uranyl and lead salts to the suspension of the red blood cells. (author)

  14. On stages of hydrothermal mineralization of molybdenum-uranium ore manifestation in volcanic edifice

    International Nuclear Information System (INIS)

    Yakovlev, P.D.; Mamotin, S.A.

    1976-01-01

    Volcanogenic-intrusive complex of the ore manifestation region is represented by various facies of liparite and granitoid formation rocks. Numerous dislocations with breaks in continuity and the corresponding feathering fissures relate to 3 stages of hydrothermal mineralization of rocks. Quartz-sericite-kaolin metasomatites were formed at the earlier (volcanic) stage. Tourmalinization was associated with the middle stage which accompanied the granitoid intrusive formation. The later mineralization stage was accompanied by formation of beresites and molibdenum-uranium ores. Identification was controlled by the dislocation, ore bodies had the shape of lens, vein or small nest. 7 stages separated by shores were identified at the ore stage: quartz-sericite pyritic; quartz-pyrite-arsenopyritic; sulfide-pitchblendic; chalcedonic; ankeritic; quartz-calcitic and pyrite-ankeritic

  15. Lung cancer mortality among nonsmoking uranium miners exposed to radon daughters

    International Nuclear Information System (INIS)

    Roscoe, R.J.; Steenland, K.; Halperin, W.E.; Beaumont, J.J.; Waxweiler, R.J.

    1989-01-01

    Radon daughters, both in the workplace and in the household, are a continuing cause for concern because of the well-documented association between exposure to radon daughters and lung cancer. To estimate the risk of lung cancer mortality among nonsmokers exposed to varying levels of radon daughters, 516 white men who never smoked cigarettes, pipes, or cigars were selected from the US Public Health Service cohort of Colorado Plateau uranium miners and followed up from 1950 through 1984. Age-specific mortality rates for nonsmokers from a study of US veterans were used for comparison. Fourteen deaths from lung cancer were observed among the nonsmoking miners, while 1.1 deaths were expected, yielding a standardized mortality ratio of 12.7 with 95% confidence limits of 8.0 and 20.1. These results confirm that exposure to radon daughters in the absence of cigarette smoking is a potent carcinogen that should be strictly controlled

  16. Uranium deposit research, 1983

    International Nuclear Information System (INIS)

    Ruzicka, V.; LeCheminant, G.M.

    1984-01-01

    Research on uranium deposits in Canada, conducted as a prerequisite for assessment of the Estimated Additional Resources of uranium, revealed that (a) the uranium-gold association in rudites of the Huronian Supergroup preferably occurs in the carbon layers; (b) chloritized ore at the Panel mine, Elliot Lake, Ontario, occurs locally in tectonically disturbed areas in the vicinity of diabase dykes; (c) mineralization in the Black Sturgeon Lake area, Ontario, formed from solutions in structural and lithological traps; (d) the Cigar Lake deposit, Saskatchewan, has two phases of mineralization: monomineralic and polymetallic; (e) mineralization of the JEB (Canoxy Ltd.) deposit is similar to that at McClean Lake; (f) the uranium-carbon assemblage was identified in the Claude deposit, Carswell Structure; and (g) the Otish Mountains area, Quebec, should be considered as a significant uranium-polymetallic metallogenic province

  17. On the genesis of the uranium occurrence in the carboniferous sediments, wadi Intahahah area, southwest Libya

    International Nuclear Information System (INIS)

    Assaf, H.S.

    1988-01-01

    In the course of covering the southwestern part of Libya by a systematic airborne radiometric survey, a significant group of anomalies was detected in the carboniferous sediments. Ground verification of these anomalies disclosed the confinement of these anomalies to the limestone and sandstone beds of the Assedjefar Formation assigned to visean-namurian age. Uranium content as much as 1000 PPm was detected. The strong lithologic control of these uranium mineralizations together with the lack of evidences of hydrothermal activity implies an intrinsic source for the uranium. The uranium, most likely, was transported and introduced into the sediments, by geochemically active groundwater, during their deposition. Uranium, from this solution, could have been adsorbed onto organic matter or clay minerals

  18. Uranium favorability of the San Rafael Swell area, east-central Utah

    International Nuclear Information System (INIS)

    Mickle, D.G.; Jones, C.A.; Gallagher, G.L.; Young, P.; Dubyk, W.S.

    1977-10-01

    The San Rafael Swell project area in east-central Utah is approximately 3,000 sq mi and includes the San Rafael Swell anticline and the northern part of the Waterpocket Fold monocline at Capitol Reef. Rocks in the area are predominantly sedimentary rocks of Pennsylvanian through Cretaceous age. Important deposits of uranium in the project area are restricted to two formations, the Chinle (Triassic) and Morrison (Jurassic) Formations. A third formation, the White Rim Sandstone (Permian), was also studied because of reported exploration activity. The White Rim Sandstone is considered generally unfavorable on the basis of lithologic characteristics, distance from a possible source of uranium, lack of apparent mineralization, and the scarcity of anomalies on gamma-ray logs or in rock, water, and stream-sediment samples. The lower Chinle from the Moss Back Member down to the base of the formation is favorable because it is a known producer. New areas for exploration are all subsurface. Both Salt Wash and Brushy Basin Members of the Morrison Formation are favorable. The Salt Wash Member is favorable because it is a known producer. The Brushy Basin Member is favorable as a low-grade resource

  19. Incidence of non-lung solid cancers in Czech uranium miners: a case-cohort study.

    Science.gov (United States)

    Kulich, M; Reřicha, V; Reřicha, R; Shore, D L; Sandler, D P

    2011-04-01

    Uranium miners are chronically exposed to radon and its progeny, which are known to cause lung cancer and may be associated with leukemia. This study was undertaken to evaluate risk of non-lung solid cancers among uranium miners in Příbram region, Czech Republic. A retrospective stratified case-cohort study in a cohort of 22,816 underground miners who were employed between 1949 and 1975. All incident non-lung solid cancers were ascertained among miners who worked underground for at least 12 months (n=1020). A subcohort of 1707 subjects was randomly drawn from the same population by random sampling stratified on age. The follow-up period lasted from 1977 to 1996. Relative risks comparing 180 WLM (90th percentile) of cumulative lifetime radon exposure to 3 WLM (10th percentile) were 0.88 for all non-lung solid cancers combined (95% CI 0.73-1.04, n=1020), 0.87 for all digestive cancers (95% CI 0.69-1.09, n=561), 2.39 for gallbladder cancer (95% CI 0.52-10.98, n=13), 0.79 for larynx cancer (95% CI 0.38-1.64, n=62), 2.92 for malignant melanoma (95% CI 0.91-9.42, n=23), 0.84 for bladder cancer (95% CI 0.43-1.65, n=73), and 1.13 for kidney cancer (95% CI 0.62-2.04, n=66). No cancer type was significantly associated with radon exposure; only malignant melanoma and gallbladder cancer showed elevated but non-significant association with radon. Radon was not significantly associated with incidence of any cancer of interest, although a positive association of radon with malignant melanoma and gallbladder cancer cannot be entirely ruled out. Copyright © 2011 Elsevier Inc. All rights reserved.

  20. National Uranium Resource Evaluation. Groundwater prospecting for sandstone-type uranium deposits: the merits of mineral-solution equilibria versus single element tracer methods. Final report

    International Nuclear Information System (INIS)

    Chatham, J.R.; Wanty, R.B.; Langmuir, D.

    1981-02-01

    Groundwaters from aquifers in two different sandstone-type uranium mining districts in Texas and Wyoming were collected and chemically analyzed. The data were used to compare the merits of using the computed saturation state of the groundwater with respect to uranium minerals, to that of single-element tracers in the groundwater for geochemical prospecting. Chemical properties of the Texas waters were influenced locally by preferred groundwater flow within buried fluvial channel deposits; upward leakage of brines along growth faults into the aquifer; and the establishment of a redox interface (Eh = 0 volts) within the aquifer. Chemical characteristics of aquifer waters in Wyoming changed gradually downdip, reflecting regional homogeneity in groundwater flow and a more gradual downdip reduction of Eh values than in Texas. The most reliable indicator of reduced uranium ore in both study sites was the saturation state of groundwater with respect to uraninite or coffinite. For both minerals, this saturation state increased from 15 to 20 log units as reduced ore deposits were approached over distances of 3 to 4.5 km in both sites. Tyuyamunite and carnotite approached or exceeded saturation in some oxidized waters of the Texas site reflecting possible occurrences of these minerals. The radiogenic elements Ta and Rn were excellent indicators of ore directly within the deposits, where anomalous values were 2 to 3 orders of magnitude above background. Helium also increased near the ore, although anomalies were generally displaced in the direction of groundwater flow. Uranium and uranium isotope values did not individually pinpoint ore, but may be used together to classify groundwater samples in terms of their position relative to uranium mineralization

  1. Occupational diseases in uranium and ore miners, related to the radiation exposure in Czech Republic, in 2003-2013

    International Nuclear Information System (INIS)

    Mueller, T.

    2014-01-01

    Dozens cases of disease of former or present uranium and ore miners are submitted to judgment as occupational diseases every year in the Czech Republic. Patients or attending physicians suggest that these cases are caused by occupational ionizing radiation. Only a part of these cases is qualified as occupational disease. The term 'occupational disease' is rather juridical term which underlies the right to financial compensation. The causal association with exposure to ionizing radiation cannot be indisputably verified by expert medical opinion. Most diseases in uranium and ore miners, which are proposed as occupational disease, are malignant tumors. The majority of judged cases are lung cancers from radioactive agents. The lecture gives general information about all judged cases of occupational diseases in former uranium and ore miners in the Czech Republic in the years 2002 - 2013. In the period 2002-13 were 40-80 cases submitted to judgment as potential occupational disease every year. (authors)

  2. Some aspects of the genesis of heavy mineral assemblages in Lower Proterozoic uranium-gold conglomerates

    International Nuclear Information System (INIS)

    Clemmey, H.

    1982-01-01

    Some genetic models for Lower Proterozoic gold- and uranium-bearing pyritic conglomerates favour a modified placer origin in which low levels of atmospheric oxygen are used to account for the survival of uraninite and pyrite. There are many difficulties with such models. New evidence concerning the genesis of the deposits is derived from a clast of ferric iron clay thought to represent a precursor sediment of the Witwatersrand Basin. Reworking of such clays and transport of a magnetite and ferric clay assemblage with subsequent sulphidation, could account for the porous pyrites, the absence of magnetite and the lack of hydraulic equivalence of the mineral grains in the conglomerates. The presence of oxygen, as indicated by the ferric iron clasts, would account for the evidence of mobility of uranium and of gold and would enhance their extraction from source rocks; particularly the release of gold from a precursor auriferous iron formation source. It is suggested that some aspects of the genesis of uranium deposits of the Witwatersrand and Elliott Lake may be similar to those of the Phanerozoic 'Roll Front' ores involving interaction between oxidizing uraniferous groundwaters and previously sulphidized and reduzate facies sediments. (author)

  3. Uranium

    International Nuclear Information System (INIS)

    Hamdoun, N.A.

    2007-01-01

    The article includes a historical preface about uranium, discovery of portability of sequential fission of uranium, uranium existence, basic raw materials, secondary raw materials, uranium's physical and chemical properties, uranium extraction, nuclear fuel cycle, logistics and estimation of the amount of uranium reserves, producing countries of concentrated uranium oxides and percentage of the world's total production, civilian and military uses of uranium. The use of depleted uranium in the Gulf War, the Balkans and Iraq has caused political and environmental effects which are complex, raising problems and questions about the effects that nuclear compounds left on human health and environment.

  4. Uranium, radium and 40K isotopes in bottled mineral waters from Outer Carpathians, Poland

    International Nuclear Information System (INIS)

    Kozlowska, B.; Walencik, A.; Dorda, J.; Przylibski, T.A.

    2007-01-01

    Radioactivity content in commercially bottled mineral waters from Outer Carpathians was investigated on the basis of 28 samples. Activity concentration results for radium isotopes 226,228 Ra, uranium isotopes 234,238 U and isotopic ratios 234 U/ 238 U were determined. The correlations between investigated isotopes and calculated potassium 40 K ions dissolved in water were carried out. The results show a correlation between TDS (total dissolved solids) values and dissolved radionuclides. High correlation coefficients were observed between total radium content and 40 K. The isotopic ratio of 234 U/ 238 U varies in the range from 1.6 to 7 in all investigated waters which means that there is no radioactive equilibrium between the parent nuclide 238 U and its daughter 234 U. The effective radiation dose coming from studied radium and uranium radionuclides consumed with mineral water from the Outer Carpathians obtained by a statistical Pole is equal to 4.3μSv/year (58 l/year water consumption) and do not exceed the permissible limit equal to 100μSv/year. Assuming 0.5 l consumption per day, i.e. 182.5 l/year, the effective dose is equal to 13.4μSv/year, what is still below the unit

  5. Mortality in uranium miners in West Bohemia: a long term cohort study

    International Nuclear Information System (INIS)

    Tomasek, L.; Kunz, E.; Swerdlow, A.J.; Darby, S.C.

    1994-01-01

    A cohort of 4320 uranium miners in West Bohemia who started work at the mines during 1948 to 1959 and worked there for at least four years were followed up to the end of 1990 to determine cause specific mortality risks in relation to exposures in the mines. The miners had experienced high radon exposures, on average 219 working level months during their uranium mining careers, for which detailed measurements were available. They had also been exposed to high arsenic levels in one of the two major mines, and to dust. New follow up methods, not previously used for occupational cohorts in Czechoslovakia, were utilised. By the end of follow up 2415 (56%) of the cohort were known to have died. Overall mortality was significantly raised compared with that in the general population, with significantly raised risks of lung cancer, accidents, homicide, mental disorders, cirrhosis, and non-rheumatic circulatory diseases. The relative risk of lung cancer was greatest four to 14 years after entry to the mines. (Author)

  6. Margaritasite: a new mineral of hydrothermal origin from the Pena Blanca uranium district, Mexico.

    Science.gov (United States)

    Wenrich, K.J.; Modreski, P.J.; Zielinski, R.A.; Seeley, J.L.

    1982-01-01

    Margaritasite, (Cs,K,H3O)2(UO2)2V2O8.nH2O (where Cs > K, H3O and n approx 1), a 10.514, b 8.425, c 7.25 A, beta 106.01o, P21/a, Z = 2, is a newly recognized uranium ore mineral named for the Margaritas deposit, Pena Blanca uranium district, Chihuahua, Mexico, at which it was discovered. A Cs-rich analogue of carnotite, margaritasite is the natural equivalent of synthetic Cs-uranyl vanadate (A.M. 43- 799, 50-825). A fine-grained yellow mineral, it is most easily distinguished from carnotite by XRD; X-ray powder patterns (CuKalpha radiation) show that the (001) reflection of margaritasite lies at 12.7o (2theta ), while that of carnotite is found at 13.8o (2theta ). The shift of the (001) reflection in margaritasite reflects the structural changes caused when Cs occupies the sites filled by K in carnotite. Synthesis experiments indicate that margaritasite also differs from carnotite in a higher-T hydrothermal origin. Chemical analyses and XRD data for margaritasite and synthetic Cs- carnotite, and chemical analyses for rocks from Sierra Pena Blanca and vicinity, are tabulated.-J.A.Z.

  7. Geology of Muntok area and the potency of menumbang granite as source of Uranium and Thorium

    International Nuclear Information System (INIS)

    Kurniawan Dwi Saksama; Ngadenin

    2013-01-01

    In the West Bangka there are some granites namely Menumbing, Pelangas, Tempilang, and Jebus granite. The granites is granite tin belt that stretches from Thailand-Malaysia-Bangka Belitung. Granite tin belt or granite source of tin (cassiterite) can act as a source of U and Th. Aims of the study is to find out the information on the geology of Muntok area and its surrounding and to determine the potency of Menumbing granite as a source of U and Th. The methods used is surface geological mapping in Muntok areas and its surrounding with scale 1 : 25.000, measurement grade of uranium and thorium in Menumbing granite areas and petrographic and grain size analysis of sample of Menumbing granite. Determination of granites a source of U and Th is based on content of radioactive mineral, anomaly of U and Th, megascopic and microscopic observation of granite. Morphology of Muntok areas and its surrounding is denudasional undulating plains to hills with an elevation ranging from 0 to 455 meters. Stratigraphy of research areas from old to young is meta sandstone units, granite intrusion of Menumbing and alluvial. Evolving fault is a fault trending West-East. Based on the presence of radioactive minerals, grade of U and Th as well as the type of granite, it was concluded that the Menumbing granite is a source of Th and not sources of U. (author)

  8. Uranium in accessory sphene from granitoids and its behaviour during mineral's alteration (Muzbekskij pluton at Mogol-Tau, Central Asia)

    International Nuclear Information System (INIS)

    Simonova, L.I.; Maksimova, I.G.; Nad'yarnykh, V.G.; Voronikhin, V.A.

    1982-01-01

    Uranium behaviour in accessory spbene and products of its alteration at different stages of granitoid transformation with characteristic association of zirconium-apatite-sphene and magnetite of accessory minerals, is shown. The products of sphene alteration (due to propylitization of granatoids the sphene is replaced by leucoxene) are determined by MS-46 electron probe microanalyzer and MA-1 lazer microanalyzer. Uranium distribution in leucoxene is studied by the method of fragmentary radiography. Leucoxene pseudomorphoses at a high oxygen potential are capable of giving into solution Uranium previously sorbed by leucoxene. This fact should be taken into account when determining source of metal of hydrogenous deposits

  9. Final environmental statement related to the Minerals Exploration Company, Sweetwater Uranium Project (Sweetwater County, Wyoming). Docket No. 40-8584

    International Nuclear Information System (INIS)

    1978-12-01

    The proposed action is the issuance of a Source Material License to Minerals Exploration Company (MEC) for the construction and operation of the proposed Sweetwater Uranium Mill in Sweetwater County, Wyoming, with a nominal capacity of 3000 tons (2.7 x 10 6 kg) per day of uranium ore. As part of this proposal, the applicant proposes also to construct a heap leaching and resin ion-exchange facility to extract uranium from low-grade ores and mine water. Conditions for the protection of the environment are set forth

  10. Discussion on the source of radon in uranium exploration method using radon-released thermal effect in minerals

    International Nuclear Information System (INIS)

    Su Shoutian.

    1985-01-01

    This paper considers the problem of the source of radon in uranium exploration method using radon-released thermal effect. In minerals by means of scintillation emanometry, we have carried out the measurement on radon content in minerals at various temperature in barren and ore-bearing granites of the granite-type uranium deposit No. 752, and inclusion decrepitation method has also been used to determine the temperature of decrepitation and its relative frequency. It was found from experiments that heated samples may release most of radon prior to inclusion decrepitation, radon released from thermal effect was, on the contrary, very little at temperature intervals of inclusion decrepitation on a large scale basis. When inclusions were ground after radon releasing, it would still release from inclusions after reheating. The radon content calculated from uranium content in inclusions is lower than the sensitivity of the determination method, so it is too difficult to be determined, indicating that the radon content released is not related to inclusions. Samples were determined by uranium chemical analysis and radium radiochemical analysis and it is obvious to note that the radon content released from thermal effect in minerals is positively correlated to the uranium and radium content. Various kinds of experiments suggest that radon is not derived from inclusions but from the whole mineral

  11. Zircon U-Pb geochronology and geochemistry of granites in the Zhuguangshan complex, South China: Implications for uranium mineralization

    Science.gov (United States)

    Zhang, Long; Chen, Zhenyu; Li, Xiaofeng; Li, Shengrong; Santosh, M.; Huang, Guolong

    2018-05-01

    The Zhuguangshan complex, composed of Caledonian, Indosinian, and Yanshanian granites, and Cretaceous mafic dykes, is one of the most important granite-hosted uranium producers in South China. Here we present LA-ICP-MS zircon U-Pb and hornblende 40Ar/39Ar geochronology and whole-rock and biotite geochemistry for the granites in this complex to evaluate the magmatism and its constraints on uranium mineralization. Samples collected from the Fuxi, Youdong, Longhuashan, Chikeng, Qiling, and Sanjiangkou intrusions yield zircon weighted 206Pb/238U ages of 426.7 ± 5.4 Ma, 226.4 ± 3.5 Ma, 225.0 ± 2.7 Ma, 152.2 ± 3.0 Ma, 153.9 ± 2.1 Ma, and 155.2 ± 2.1 Ma, respectively. A new Ar-Ar dating of the hornblende of the diabase from the Changjiang uranium ore field yields a plateau age of 145.1 ± 1.5 Ma. These results coupled with published geochronological data indicate that six major magmatic events occurred in the study area at 420-435 Ma, 225-240 Ma, 150-165 Ma, 140 Ma, 105 Ma, and 90 Ma. Both U-bearing and barren granites occur in this complex, and they display differences in whole-rock and biotite geochemistry. The barren granites show higher Al2O3, CaO, TFMM, Rb, Zr, Ba, SI, Mg#, (La/Yb)N, and Eu/Eu*, but lower SiO2, ALK, Rb, DI, Rb/Sr, and TiO2/MgO than those of the U-bearing granites. Biotites in the U-bearing granites are close to the Fe-rich siderophyllite-annite end member with Fe/(Fe + Mg) ratios higher than 0.66, whereas those in the barren granites are relatively close to the Mg-rich eastonite-phlogopite end member with Fe/(Fe + Mg) ratios uranium ore potential of the granites in the Zhuguangshan complex. The geochemical variations of U-bearing and barren granites can serve as a potential detector for granite-hosted uranium deposits.

  12. Uranium enriched granites in Sweden

    International Nuclear Information System (INIS)

    Wilson, M.R.; Aakerblom, G.

    1980-01-01

    Granites with uranium contents higher than normal occur in a variety of geological settings in the Swedish Precambrian, and represent a variety of granite types and ages. They may have been generated by (1) the anatexis of continental crust (2) processes occurring at a much greater depth. They commonly show enrichement in F, Sn, W and/or Mo. Only in one case is an important uranium mineralization thought to be directly related to a uranium-enriched granite, while the majority of epigenetic uranium mineralizations with economic potential are related to hydrothermal processes in areas where the bedrock is regionally uranium-enhanced. (Authors)

  13. Exposure to enhanced levels of radioactivity and toxic metals in uranium mining areas

    International Nuclear Information System (INIS)

    Carvalho, F.P.; Madruga, M.J.; Alves, J.G.; Reis, M.C.; Oliveira, J.M.; Leite, M.M.; Pinto, E.M.; Falcao, J.M.

    2006-01-01

    elevated in the vicinity of uranium mining areas. For instance, average values of 103 mg/L Cu, 35 mg/L Pb and 48 mg/L U were measured in soils nearby one of the main mining areas, and decrease to 37, 26, and 19 mg/L, respectively, in the agriculture soils of the region. Concentrations in underground waters decrease from 4.0 μg/L Cu, 2.1 μg/L Pb and 1.9 μg/L U to 1.8 μg/L Cu, 1.3 μg/L Pb and 1.5 μg/L U for the same comparison scenario. Despite the complexity of the element distribution patterns found, it was possible to recognize geochemical trends in the concentrations of a set of elements that is positively correlated with the vicinity of uranium mineralizations and uranium mining works. (authors)

  14. Proterozoic stratabound dolostone-hosted uranium mineralisation in the Komantula - Reddypalle area, Cuddapah basin, Anantpur district, Andhra Pradesh, India

    International Nuclear Information System (INIS)

    Sharma, U.P.; Pandit, S.A.; Gangadharan, G.R.; Panda, Arjuna; Roy, Minati

    1998-01-01

    The Komantula-Reddypalle area constitutes the northern sector of the 160 km long, uranium mineralised belt along the western and southern margins of the Cuddapah basin. The mineralisation is hosted by impure dolostone of the Vempalle Formation of Cuddapah Supergroup and occurs in the form of pitchblende, coffinite and U-Ti complexes. Uranium minerals occur along the bedding plane, carbonate-phosphate mineral contact, suture boundaries of microstylolites, and grain boundaries of clasts. The ore bearing horizon has been traced for about 65 kms and samples have assayed from 0.01% to 0.67% U 3 O 8 with negligible thorium. The source of uranium for this mineralisation appears to be the nearby fertile basement granitic rocks present in the western margins of Cuddapah basin. This mineralisation as compared with those found in the Tummallapalle-Rachkuntapalle area in the southern sector, contains high Cu (65-8100 ppm) and low P 2 O 5 (0.07-0.59 wt%) and significant but varying Mo (20-292 ppm). Stratigraphically, this area differs from that of Tummalapalle-Rachkuntapalle area to its south in two respects, viz., absence of intraformational conglomerate below and presence of a non-radioactive limestone above the radioactive dolostone. (author)

  15. Integrating Apparent Conductance in Resistivity Sounding to Constrain 2D Gravity Modeling for Subsurface Structure Associated with Uranium Mineralization across South Purulia Shear Zone, West Bengal, India

    Directory of Open Access Journals (Sweden)

    Arkoprovo Biswas

    2014-01-01

    Full Text Available South Purulia Shear Zone (SPSZ is an important area for the prospect of uranium mineralization and no detailed geophysical investigations have been carried out in this region. To delineate the subsurface structure in the present area, vertical electrical soundings using Schlumberger array and gravity survey were carried out along a profile perpendicular to the SPSZ. Apparent conductance in the subsurface revealed a possible connection from SPSZ to Raghunathpur. The gravity model reveals the presence of a northerly dipping low density zone (most likely the shear zone extending up to Raghunathpur under a thin cover of granitic schist of Chotanagpur Granite Gneissic Complex (CGGC. The gravity model also depicts the depth of the zone of density low within this shear zone at ~400 m near Raghunathpur village and this zone truncates with a steep slope. Integration of resistivity and gravity study revealed two possible contact zones within this low density zone in the subsurface at depth of 40 m and 200 m. Our study reveals a good correlation with previous studies in Raghunathpur area characterized by medium to high hydro-uranium anomaly. Thus the conducting zone coinciding with the low gravity anomaly is inferred to be a possible uranium mineralized zone.

  16. On the geological background of the mineralization of carbonate-siliceous-pelitic stratabound uranium deposits in south China and variety of their metallogenesis

    International Nuclear Information System (INIS)

    Zhang Zuhuan.

    1986-01-01

    The carbonate-siliceouspelitic uranium deposits which widely distributed in South China are more typical stratabound deposits. According to the horizon of ore bearing formation it may be divided into two major types, i.e. Sinian-Cambrian series and upper Palaeozoic group. The formation of uranium source bed was closely related with the crustal evolution of that area. The process of transformation of uranium source bed into uranium deposits being more complexity and variety. Therefore, this kind of deposits was commomly subdivided into three types----sedimentary diagenetic type, leaching precipitation type and hydrothermal reworked type. Among which the former two types are rarely appeared, and the sedimentary diagenetic type is so far not very reliable. The hydrothermal reworked type being the most important one; but they also showing different characteristics in metallogenesis, especially on the relation with granite body situated nearby. Thus, different understandings around their genesis were existed. This paper discusses the geological and geochemical characteristics of several deposits with different processes of mineralization and suggest a scheme for further classification of these of uranium deposits

  17. Effects of hydrocarbon generation on fluid flow in the Ordos Basin and its relationship to uranium mineralization

    Directory of Open Access Journals (Sweden)

    Chunji Xue

    2011-07-01

    Full Text Available The Ordos Basin of North China is not only an important uranium mineralization province, but also a major producer of oil, gas and coal in China. The genetic relationship between uranium mineralization and hydrocarbons has been recognized by a number of previous studies, but it has not been well understood in terms of the hydrodynamics of basin fluid flow. We have demonstrated in a previous study that the preferential localization of Cretaceous uranium mineralization in the upper part of the Ordos Jurassic section may have been related to the interface between an upward flowing, reducing fluid and a downward flowing, oxidizing fluid. This interface may have been controlled by the interplay between fluid overpressure related to disequilibrium sediment compaction and which drove the upward flow, and topographic relief, which drove the downward flow. In this study, we carried out numerical modeling for the contribution of oil and gas generation to the development of fluid overpressure, in addition to sediment compaction and heating. Our results indicate that when hydrocarbon generation is taken into account, fluid overpressure during the Cretaceous was more than doubled in comparison with the simulation when hydrocarbon generation was not considered. Furthermore, fluid overpressure dissipation at the end of sedimentation slowed down relative to the no-hydrocarbon generation case. These results suggest that hydrocarbon generation may have played an important role in uranium mineralization, not only in providing reducing agents required for the mineralization, but also in contributing to the driving force to maintain the upward flow.

  18. Phanerozoic extensional faulting and alteration control on uranium mineralization in trachytes of the Central Eastern Desert of Egypt

    Science.gov (United States)

    Hamdy, Mohamed M.; Waheeb, Anton G.; Aly, Samir M.; Farag, Nagdy M.; Sadek, Adel F.

    2017-12-01

    The Gabal Nasb El Atshan Upper Carboniferous-Lower Permian altered trachytes include uranium up to 3165 ppm. The paleostress and resolved shear stress analyses of the deformation systems in Gabal Nasb El Atshan area indicate that the trachyte was subjected to WNW-ESE to E-W tensile shear stress directed extensional regimes. The low-stress regions in the vicinity of extensional faults and their associated joints were favorable locations for fluid flow and the consequence alteration and U-mineralization. This occurred more extensively along the contacts between the sills of trachyte and the Hammamat sedimentary rocks; where the latter acted as a physical barrier for the alteration fluids migration outward. Alteration styles include albitization, aegirinization, arfvedsonization, chloritization and ferruginisation. The albitization is the most common sodic metasomatism, giving sanidine from Or98.8Ab0.7 to Or62.3Ab37.6, anorthoclase from Or51.4Ab48.0 to Or12.2Ab87.6 and albite from Or11.0Ab89.0 to Or0.8Ab99.2. Aegirine and arfvedsonite formed due to decreasing sodium activity in the metasomatic fluids. Sodic metasomatism may be the source of uranium-enrichment, taking place during the late magmatic to deuteric processes. This was followed by a retrograde alteration of chloritization between 175 and 42 °C toward precipitation of Fe-oxides and alteration of primary uranium. Surficial low-temperature alteration remobilized and redistributed the produced uranylhydroxides and ferruginisation caused the reduction and adsorption of U forming betafite, uranophane, soddyite, umohoite, uranotile and uranopilite.

  19. Lineament analysis of mineral areas of interest in Afghanistan

    Science.gov (United States)

    Hubbard, Bernard E.; Mack, Thomas J.; Thompson, Allyson L.

    2012-01-01

    During a preliminary mineral resource assessment of Afghanistan (Peters and others, 2007), 24 mineralized areas of interest (AOIs) were highlighted as the focus for future economic development throughout various parts of the country. In addition to located mineral resources of value, development of a viable mining industry in Afghanistan will require the location of suitable groundwater resources for drinking, processing of mineral ores for use or for export, and for agriculture and food production in areas surrounding and supporting future mining enterprises. This report and accompanying GIS datasets describe the results of both automated and manual mapping of lineaments throughout the 24 mineral occurrence AOIs described in detail by Peters and others (2007; 2011). For this study, we define lineaments as "mappable linear or curvilinear features of a surface whose parts align in a straight or slightly curving relationship that may be the expression of a fault or other linear zones of weakness" as derived from remote sensing sources such as optical imagery, radar imagery or digital elevation models (DEMs) (Sabins, 2007).

  20. Tectonic characteristics and uranium prospecting direction in Suasu area

    International Nuclear Information System (INIS)

    A Zhongming; Wang Baoqun

    2002-01-01

    The Suasu area geologically is divided into three subsidiary tectonic units, namely the southern syncline, the median uplift and the northern monoclinal zone. Authors suggest that uranium ore-formation occurred after the appearance of the above subsidiary tectonic units, and sandstone bodies of the II, III, IV, VII cycles, Shuixigou Group in the southern syncline, and sandstone bodies of the I, II, III, V cycles, Shuixigou Group, as well as sandstone bodies of Xiaoquangou Group in the northern monoclinal zone, they are prospecting potential. According to metallogenic conditions, such as the continuity and distribution area of the ore-hosting horizon, characteristics of sandstone bodies and features of interlayer oxidation zone, prospecting potential of the northern monoclinal zone is better than that of the southern syncline

  1. Aspects of the sedimentology of some uranium-bearing sandstones in the Beaufort West area, Cape Province

    International Nuclear Information System (INIS)

    Cole, D.I.

    1980-01-01

    The sedimentology of some uranium-bearing sandstones from the Beaufort Group in the Beaufort West area was studied by use of some 116 vertical profiles measured across and adjacent to 14 mineralized deposits. The vertical profiles consist of 91 field sections and 25 borehole logs. The sandstones are usually multistorey and alternate with a mudstone and/or siltstone succession. The vertical profiles basically consist of a succession of facies. Some 19 facies were recognised within the sandstones on the basis of texture and sedimentary structure. The facies transitions within the sandstone sequence were subjected to a one-step Markov chain analysis. The cumulative thickness of uranium mineralization for each sedimentary facies within the sandstone sequence was measured. Some 99 per cent of the total cumulative thickness occurs within the coarser-grained facies (grain sizes in excess of very fine), which suggests that permeability was an important control on the mineralization. The coarser-grained facies, which mostly represent lower point bar or channel bar deposits near the base of each storey, probably acted as suitable aquifers for the transport of uraniferous solutions. Irregularities in the base of each storey may have interrupted the flow of these solutions and allowed sufficient time for precipitation of the uranium. Carbonaceous debris is frequently associated with the mineralized deposits and most likely acted as an indirect reductant for this precipitation. Mineralization decreases upwards in the sandstone sequence and some 40 per cent of the total cumulative thickness is restricted to the initial storey. The horizontally bedded facies contain a high proportion of the total cumulative thickness of mineralization (45 per cent) and this again may be related to a more abundant content of carbonaceous debris

  2. Effect of mineral constituents in the bioleaching of uranium from uraniferous sedimentary rock samples, Southwestern Sinai, Egypt

    International Nuclear Information System (INIS)

    Amin, Maisa M.; Elaassy, Ibrahim E.; El-Feky, Mohamed G.; Sallam, Abdel Sattar M.; Talaat, Mona S.; Kawady, Nilly A.

    2014-01-01

    Bioleaching, like Biotechnology uses microorganisms to extract metals from their ore materials, whereas microbial activity has an appreciable effect on the dissolution of toxic metals and radionuclides. Bioleaching of uranium was carried out with isolated fungi from uraniferous sedimentary rocks from Southwestern Sinai, Egypt. Eight fungal species were isolated from different grades of uraniferous samples. The bio-dissolution experiments showed that Aspergillus niger and Aspergillus terreus exhibited the highest leaching efficiencies of uranium from the studied samples. Through monitoring the bio-dissolution process, the uranium grade and mineralogic constituents of the ore material proved to play an important role in the bioleaching process. The tested samples asserted that the optimum conditions of uranium leaching are: 7 days incubation time, 3% pulp density, 30 °C incubation temperature and pH 3. Both fungi produced the organic acids, namely; oxalic, acetic, citric, formic, malonic, galic and ascorbic in the culture filtrate, indicating an important role in the bioleaching processes. - Highlights: • Aspergillus niger and Aspergillus terreus are the only isolates achieved highest leaching efficiency of uranium from the studied samples. • Bioleaching process directly related to variations in mineral constituents and uranium grades. • The optimum conditions of uranium bioleaching from its ores, were found to be 7 days, 3% pulp density, pH 3 and 30 °C. • A. niger and A. terreus organic acids play an important and effective role for uranium leaching process

  3. Application of anatectic mineralization to prospecting in-situ leachable sandstone type uranium ore in South Songliao Basin

    International Nuclear Information System (INIS)

    Zhao Zhonghua

    2001-01-01

    The deep ore-forming origin is a new theory for prospecting in-situ leachable sandstone type uranium. Tectonics, lithologic and geochemistry are basic forecasting criteria. Previous unconsolidated sand, source area and geochemical barrier are three essential conditions for forming uranium deposit. Metallogenic environment and prospective region are found. Tertiary system is prospective layer for prospecting in-situ leachable sandstone type uranium ore in south Songliao Basin

  4. Navajo birth outcomes in the Shiprock uranium mining area

    International Nuclear Information System (INIS)

    Shields, L.M.; Wiese, W.H.; Skipper, B.J.; Charley, B.; Benally, L.

    1992-01-01

    The role of environmental radiation in the etiology of birth defects, stillbirths, and other adverse outcomes of pregnancy was evaluated for 13,329 Navajos born at the Public Health Service/Indian Health Service Hospital in the Shiprock, NM, uranium mining area (1964-1981). More than 320 kinds of defective congenital conditions were abstracted from hospital records. Using a nested case-control design, families of 266 pairs of index and control births were interviewed. The only statistically significant association between uranium operations and unfavorable birth outcome was identified with the mother living near tailings or mine dumps. Among the fathers who worked in the mines, those of the index cases had histories of more years of work exposure but not necessarily greater gonadal dosage of radiation. Also, birth defects increased significantly when either parent worked in the Shiprock electronics assembly plant. Overall, the associations between adverse pregnancy outcome and exposure to radiation were weak and must be interpreted with caution with respect to implying a biogenetic basis

  5. Clay minerals trap hydrogen in the Earth's crust: Evidence from the Cigar Lake uranium deposit, Athabasca

    Science.gov (United States)

    Truche, Laurent; Joubert, Gilles; Dargent, Maxime; Martz, Pierre; Cathelineau, Michel; Rigaudier, Thomas; Quirt, David

    2018-07-01

    Hydrogen (H2)-rich fluids are observed in a wide variety of geologic settings including gas seeps in serpentinized ultramafic rocks, sub-seafloor hydrothermal vents, fracture networks in crystalline rocks from continental and oceanic crust, and volcanic gases. Natural hydrogen sources can sustain deep microbial ecosystems, induce abiotic hydrocarbons synthesis and trigger the formation of prebiotic organic compounds. However, due to its extreme mobility and small size, hydrogen is not easily trapped in the crust. If not rapidly consumed by redox reactions mediated by bacteria or suitable mineral catalysts it diffuses through the rocks and migrates toward the surface. Therefore, H2 is not supposed to accumulate in the crust. We challenge this view by demonstrating that significant amount of H2 may be adsorbed by clay minerals and remain trapped beneath the surface. Here, we report for the first time H2 content in clay-rich rocks, mainly composed of illite, chlorite, and kaolinite from the Cigar Lake uranium ore deposit (northern Saskatchewan, Canada). Thermal desorption measurements reveal that H2 is enriched up to 500 ppm (i.e. 0.25 mol kg-1 of rock) in these water-saturated rocks having a very low total organic content (reported elsewhere for pure clay minerals or shales. Sudoite (Al-Mg di-trioctahedral chlorite) is probably the main mineral responsible for H2 adsorption in the present case. The presence of multiple binding sites in interlinked nanopores between crystal layers of illite-chlorite particles offers the ideal conditions for hydrogen sorption. We demonstrate that 4 to 17% of H2 produced by water radiolysis over the 1.4-Ga-lifetime of the Cigar Lake uranium ore deposit has been trapped in the surrounding clay alteration haloes. As a result, sorption processes on layered silicates must not be overlooked as they may exert an important control on the fate and mobility of H2 in the crust. Furthermore, the high capacity of clay minerals to sorb molecular

  6. Prospection works for uranium mineralizations in the sector Centro Escolar. Province of Pinar del Rio

    International Nuclear Information System (INIS)

    Alcaide Orpi, J.; Pena Fortes, B.; Olivera Acosta, J.; Leal Ramirez, R.; Geler Roffe, T.; Sanchez Rumayor, J.

    1996-01-01

    The present article shows the final results obtained from the prospection works, realized in a sector Centro Escolar. Those works were projected in order to search radioactive minerals accumulations in some prospective areas. The main result was the selection of a perspective area which have been recommended to be evaluated in depth

  7. National Uranium Resource Evaluation Program. Hydrogeochemical and stream sediment pilot survey of Llano area, Texas

    International Nuclear Information System (INIS)

    Nichols, C.E.; Kane, V.E.; Minkin, S.C.; Cagle, G.W.

    1976-01-01

    A pilot geochemical survey of the Llano, Texas, area was conducted during February and March 1976. The purpose of this work was to prepare for a subsequent reconnaissance geochemical survey of uranium in Central Texas. Stream sediment, stream water, well water, and plant ash from five geologic areas were analyzed in the laboratory for approximately 25 parameters. Examples of anomalous values in stream sediment and stream water indicate the usefulness of both sample types in identifying anomalies at a regional reconnaissance-scale station spacing of approximately 5 km (3 mi). Groundwater samples, which generally best indicate the geochemistry of formations at depth in a survey of this type, represent another important tool in detecting uranium mineralization. Anomalies in San Saba County are associated with the Marble Falls-Smithwich Formations and the Strawn Series (Pennsylvanian), the Houy Formation (Devonian and lower Mississippian), and the Hickory Sandstone Member of the Riley Formation (Cambrian). In Burnet County anomalous values are due to the influence of the Valley Spring Formation (Precambrian); and in Blanco County anomalies are found associated with the Riley Formation

  8. Mortality risk in the french cohort of uranium miners: extended follow-up 1946-1999

    International Nuclear Information System (INIS)

    Blandine Vacquier; Dominique Laurier; Sylvaine Caer; Benoit Quesne

    2006-01-01

    Since the 1970's, exposure to radon and to its radioactive decay products has been studied in relation to lung cancer risk among cohorts of miners [1-3]. These studies concluded that cumulative exposure to radon was associated with an increased risk of death from lung cancer. In 1988, the International Agency for Research on Cancer (IARC) classified radon as a known pulmonary human carcinogen [4]. The French cohort of uranium miners has been established in order to assess the mortality risk of miners exposed to low levels of radon and its decay products as well as to other occupational hazards. The primary aim of the cohort study is the quantification of the relationship between cumulated radon exposure and risk of lung cancer death. The study has been conducted by the Institut de Radioprotection et de Surete Nucleaire (IRSN) since 1982, in collaboration with the Occupational Medical Service of COGEMA. The French Data Protection Authority (CNIL) gave approval for this study. Previous analyses have demonstrated an excess of lung cancer death associated with radon exposure. These results regarding lung cancer have been presented in several publications and congress [5-11]. In 2004, the follow-up of this cohort was extended from 31 December 1994 through 31 December 1999. The extension of the follow-up increases the statistical power of the cohort. The present article describes the extended cohort and the analysis of mortality based on the follow-up of the cohort to end of 1999. (authors)

  9. Integration of NURE and other data sets, southwest Montana and northeast Idaho: an orientation study to characterize mineralized environments. National Uranium Resource Evaluation

    International Nuclear Information System (INIS)

    Madson, M.E.; Karp, K.E.; D'Andrea, R.F. Jr.; Morrison, B.C.

    1983-04-01

    Mineralized environments in the Dillon, Butte, Hamilton, and Elk City 1 0 x 2 0 NTMS Quadrangles were identified and characterized from the National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance and Aerial Radiometric and Magnetic Survey data, folio data, and other data sets used in this study. Methods applied to reconnaissance for uranium during the NURE program were used successfully in this project to recognize and delineate locales that have mineral-resource potential. These methods included preparation and interpretation of maps of geochemical, aerial radiometric, and aeromagentic data, as well as interpretation of univariate and multivariate statistical analyses of NURE data sets. Data interpretations were conducted by a contingency approach that puts a variety of statistical and cartographic tools at the disposal of the geologist. These tools were applied selectively to the data until the geochemical and geophysical signature of an anomalous locale was described and characterized to the geologist's satisfaction. Ten areas known to be mineralized were described as type localities and used to calibrate the geochemical and geophysical models employed in the study. Other areas exhibiting anomalous geochemical and (or) geophysical characteristics were analogized to the type localities. Thirty anomalous areas were delineated during this study; 17 of the 30 are believed to warrant further investigation. Three locales contain Tertiary intrusive bodies that were delineated on the basis of their characteristic signatures and trace-element contents. 5 figures, 10 tables

  10. A survey for elevated levels of uranium north of the 300 Area on the Hanford Site

    International Nuclear Information System (INIS)

    Poston, T.M.

    1990-04-01

    A comprehensive survey of soil uranium (U) concentrations in a study area due north of the 300 Area on the Hanford site has been conducted by Pacific Northwest Laboratory (PNL). The objective of the study was to determine the spatial distribution of uranium in the study area and to ascertain if background levels of uranium have been increased by Hanford operations. Based on the spatial distribution of 238 U, the highest concentrations of uranium are located in the southern portion of the study area adjacent to the 300 Area complex and in the most eastern zone of the study site bordering the Columbia River. Uranium-236, an isotopic marker of fuel processing activities in the 300 Area, was detected in all eight samples selected from the study. A significant and positive regression was demonstrated between the ratios of 236 U/ 238 U in these eight samples and proximity to the 300 Area. 9 refs., 18 figs., 9 tabs

  11. Assessment of radiological risk in vicinity of former uranium mining areas in Poland

    Energy Technology Data Exchange (ETDEWEB)

    Ciupek, K.; Krajewski, P.; Kardas, M.; Suplinska, M. [Central Laboratory for Radiological Protection (Poland)

    2014-07-01

    The work carried out under the project NCBiR - 'Technologies Supporting Development of Safe Nuclear Power Engineering'; Task 3: Meeting the Polish nuclear power engineering's demand for fuel - fundamental aspects. Human activities related to the use of ionizing radiation and radioactive substances might cause exposure of the population and the environment. However, radiological risk assessment is mainly conducted only to human as an estimation of the effective dose being the sum of external and internal exposure whereas environmental protection assessment is more complex studies. The increased interest in recent years in this aspect and the ability to perform computer simulations contributed the development of models enabling assessment of exposure to certain organisms and estimation the concentrations of radionuclides in the various components of the environment. These models define a possible transition path of radionuclide in the atmosphere or waterways through their physical parameterization. The estimation of the content of radionuclides in plants, animals and human is possible by applying an existing risk assessment methodology. Models assessing human and environmental exposure from natural and artificial radionuclides, such as CROM, RESRAD, IMPACT or ERICA, come to be useful tools not only for researchers but also for regulatory authorities. This case study focused on the uranium mining areas (inactive mines and waste dumps) in the Giant Mountains (Karkonosze Mountains) in the south-west of Poland. On the basis of activity concentrations in samples of soil and mineral material from mine shafts, water samples from ponds, streams and small rivers and vegetation samples, an assessment of radiological impact of the former uranium mining areas was performed. The doses for reference group of inhabitants and biota in the vicinity of the former uranium mine were evaluated using IMPACT (EcoMetrix Inc.) model and ERICA tool. The variability and

  12. Study on palynological assemblages and the relationship with uranium mineralization of the tengger depression in the erlian basin

    International Nuclear Information System (INIS)

    Liu Lu; Dai Mingjian

    2014-01-01

    Tengger depression of Erlian basin, which was a Cenozoic inland depression, developed in the late Variscan Orogeny and along the long axis trending of east to west. The upper member of Sanhan Formation is the main prospecting target horizon in Tengger area. Besides, the lower member of Sanhan Formation is also taken into account the prospecting target horizon in this area. Comprehensive analysis of the palynological assemblages collected from NO. TZK2-4 core samples in Tengger area indicates that the time of sediment occurred in Early Cretaceous and roughly equivalent to the Aptian-Albian age. Furthermore, it can determine those core sample should be the important prospecting target horizon-Sanhan Formation of Lower Cretaceous in studied area. And the climate characteristic was warm and humid subtropical climate, and had the transition to sub-humid to semi-hot condition. It can be inferred that ancient warm and humid or fluctuation station of warm and humid to semi-arid climate was favorable to the uranium mineralization. (authors)

  13. Dose-response relationship analysis for cancer and circulatory system disease mortality risks among uranium miners

    International Nuclear Information System (INIS)

    Drubay, Damien

    2015-01-01

    The relation between lung cancer risk and radon exposure has been clearly established, especially from the studies on uranium miner cohorts. But the association between radon exposure and extrapulmonary cancers and non-cancer diseases remains not well known. Moreover, the health risks associated with the other mining-related ionizing radiation exposures are still under consideration. The aim of this thesis is to contribute to the estimation of the radio-induced health risks at low-doses through the analysis of the kidney cancer and Circulatory System Disease (CSD) mortality risks among uranium miners. Kidney cancer mortality risk analyses were performed from the French cohort of uranium miners (n=5086; follow-up period: 1946-2007), the post-55 cohort (n=3,377; follow-up period: 1957-2007) and the German cohort of the Wismut (n=58,986; follow-up period: 1946-2003) which included 24, 11 and 174 deaths from kidney cancer, respectively. The exposures to radon and its short-lived progeny (expressed in Working Level Month WLM), to uranium ore dust (kBqh.m -3 ) and to external gamma rays (mSv) were estimated for each miners and the equivalent kidney dose was calculated. The dose-response relation was refined considering two responses: the instantaneous risk of kidney cancer mortality (corresponding to the classical analysis, Cause specific Hazard Ratio (CSHR) estimated with the Cox model) and its occurrence probability during the followup (Sub-distribution Hazard Ratio (SHR) estimated with the Fine and Gray model). An excess of kidney cancer mortality was observed only in the French cohort (SMR = 1.62 CI95%[1.04; 2.41]). In the Wismut cohort, a decrease of the kidney cancer mortality was observed (0.89 [0.78; 0.99]). For these three cohorts, the occupational radiological exposures (or the equivalent kidney dose) were significantly associated neither with the risk of kidney cancer mortality (e.g. CSHRWismut-radon/100 WLM=1.023 [0.993; 1.053]), nor with its occurrence

  14. Performance Assessment Transport Modeling of Uranium at the Area 5 Radioactive Waste Management Site at the Nevada National Security Site

    International Nuclear Information System (INIS)

    2010-01-01

    Following is a brief summary of the assumptions that are pertinent to the radioactive isotope transport in the GoldSim Performance Assessment model of the Area 5 Radioactive Waste Management Site, with special emphasis on the water-phase reactive transport of uranium, which includes depleted uranium products. The Area 5 PA model assumes activity disposed in trenches is well mixed within the native alluvium of the trench at the time the facility is closed. Waste containers and waste forms are assumed not to limit the release of radionuclides for transport. In the Area 5 RWMS PA model, the pathways that are considered to bring radioactivity in the waste zone to the surface soils of the closure covers are (1) plant uptake, (2) burrowing animal activity, and (3) advection/dispersion/diffusion in the pore water. Water-phase transport is a minor component of the transport, which is dominated by plant uptake and burrowing animal activity. Because the soil column is mostly dry, upward water flux rates are extremely small, resulting in small advective/dispersive transport of radioactive isotopes in pore water of the unsaturated zone. Reactive transport of radioactive elements in the Area 5 soil pore water are modeled using element-specific partition coefficients (Kds) that partition radioactivity between pore water and soil of the disposal cell, and solubility limits that control the solubility of elements in pore water. Geochemical modeling is not performed in the Area 5 RWMS GoldSim PA model; however, Kds and solubility limits were derived from previous geochemical modeling performed using Area 5 geochemical data. Kds for uranium were developed based on geochemical modeling using the mineral characteristics of soil (alluvium) and the chemical characteristics of water at the site (Carle et al., 2002). In the GoldSim model, uranium Kd is represented with a lognormal distribution with a mean value of 0.8 milliliter per gram (taken from Figure 4.11, Page 4-19 of Carle et al

  15. Characteristics of mesozoic magmatic rocks in western Zhejiang and their relation with uranium mineralization

    International Nuclear Information System (INIS)

    Zhou Jiazhi

    2000-01-01

    The author summarizes characteristics of Mesozoic (Yangshanian Period) acid-intermediate volcanics, sub-volcanics and basic intrusive from aspects of formation time of rock series, petrogenic sequence, chemical composition, rock -controlling factors and petrogenic environments. It is suggested that these rocks were originated from different source areas of crust and mantle. Based on the time-space relation between different types uranium deposits and magmatic rocks, the author proposes that: the earlier stage (Earlier Cretaceous) U-hematite ores were originated from acid volcanic magmatism of crustal source, but the later stage (Late Cretaceous) pitchblende-polymetallic sulfide and pitchblende-purple fluorite rich ores were derived from basic magmatism of mantle source. Finally, the author proposes prospecting criteria of the above two types of uranium deposits

  16. U-Pb ages related to uranium mineralization of Lagoa Real, Bahia - Brazil: tectonic implications

    Energy Technology Data Exchange (ETDEWEB)

    Chaves, Alexandre O.; Rios, Francisco J.; Oliveira, Lucilia A.R.; Alves, James V.; Fuzikawa, Kazuo; Neves, Jose M.C.; Chaves, Adriana M.D.V.; Prates, Sonia P. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)]. E-mail: aoc@cdtn.br; Tubrett, Michael [Memorial University of Newfoundland, NL (Canada). Inco Innovation Centre. MicroAnalysis Facility; Matos, Evando C. [Industrias Nucleares do Brasil S.A. (INB), Rio de Janeiro, RJ (Brazil)

    2007-07-01

    The uranium from Lagoa Real (Bahia/Brazil) is associated with syenitic magmatism (1904 {+-}44 Ma minimum age from upper intercept of zircon U-Pb discordia by LA-ICP-MS) belonging to a mafic/ felsic lithologic association linked to the final stages of 2.05-1.80 Ga Orosirian Orogeny, which acted in the Paramirim Block. These syenitic rocks are rich not only in albite, but also in U-rich titanite (source of uranium). In association with the development of the Orosirian ductile shear zones, the syenites were crystallized and deformed. The metamorphic reactions, which include intense recrystallization of magmatic minerals, led uraninite to precipitate (1868 {+-} 69 Ma; U-Pb by LA-ICP MS) under Redox control. A second population of uraninites was also generated by shear zones reactivation during 0.6-0.5 Ga Brasiliano Orogeny (605 {+-} 170 Ma; U-Pb by LA-ICP-MS). The geotectonic implications are: a) the importance of the Orosirian event in the Paramirim Block during paleoproterozoic Sao Francisco/Congo Craton edification and b) the influence of the Brasiliano event in the Paramirim Block during the West-Gondwana assembly processes, indicated by the 605 {+-} 170 Ma uraninite (second population) age and by the 483 {+-} 100 Ma lower intercept of the metamorphosed syenite U-Pb discordia. (author)

  17. Lung cancer and bronchi-pulmonary diseases of iron uranium miners

    International Nuclear Information System (INIS)

    Gneusheva, G. I.; Uspenskaya, K. M.

    2004-01-01

    The lung cancer mortality has been analyzed for 2.582 miners employed from 1943 to 1961. All persons observed had three years occupation at least. Basing upon the lung cancer risk value per unit of the exposure, the assessment of the effective standard of pulmonary organ irradiation to radon progeny was elaborated and mortality excess was calcuated. Medical demography studies of morbidity and mortality were elaborated for silicosis, silicotuberculosis, lung cancer and occupational bronchitis versus the magnitude of dust and radiation exposure. Annual and cumulative exposures have been assessed for seven cohorts of miners employed and vast primary material has been accumulated for the period of 40 years (1943-1984). Intensive indice of mortality were determined for observation periods. The mortality excess was compared to cumulated radiation exposure. The lung cancer mortality excess in iron-uranium miners was 3.3 cases per 106 man-years per 1 WLM; 4.8 cases per 106 man-years per 1 WLM was assessed if first years of occupation are negected. The latent period from radiation exposure to death from lung cancer is generally ten year or more. Changes of miners labor conditions (the magnitude of dust exposure) have been reflected by the bronchi pulmonary disease structure. The input of these dieseases into the occupational lung pathology has been significantly changed with the time course. Within first 18-20 years, pneumoconiosis was the only form of occupational lung pathology in the mine, whereas occupational bronchis and lung cancers were recorded within next then years thereafter. In cohorts of longest observation period, the average age of patients was increasingly ranked versus diseases as follows: silicosis, silicotuberculosis, chronic bronchitis, and lung cancer. (Author)

  18. Occupational diseases in uranium and ore miners in connection with radiation exposure in the Czech Republic

    International Nuclear Information System (INIS)

    Mueller, T.

    2003-01-01

    Dozens cases of diseases are submitted to judgement as occupational diseases every year in the Czech Republic. Patients or attending physicians suggest that these cases are caused by occupational ionizing radiation. Only a part of these cases is qualified as occupational disease. The term 'occupational disease' is rather a juridical term which underlies the right to financial compensation. The causal association with exposure to ionizing radiation cannot be indisputably verified by expert medical opinion. Most diseases, which are proposed as occupational disease, are malignant tumors of the lungs. Total majority of judged cases are lung cancers from radioactive agents. In 2002, a total of 33 cases of lung cancer in former uranium or ore miners have been acknowledged as occupational diseases. The decision about occupational disease is derived from probabilistic approach based on estimation of probability of causation of irradiation on disease origin (methodical guideline No. 15 of Ministry of Health Bulletin, part 9, 1998). The presented paper gives a general information about all judged causes of occupational diseases in former uranium and ore miners in the Czech Republic in 2002. A total of 72 cases were submitted to judgement of conditions of disease origin to the National Radiation Protection Institute in 2002. 67 cases were lung cancers, 1 case was chronic myeloid leukemia, acute myeloid leukemia, basaliom, cancer of larynx and cancer of nasal septum. The probability of causation was assessed as prevailing in 32 cases of lung cancer, borderline in 5 cases and low in other 30 cases of lung cancer. The probability of causation was prevailing in both cases of myeloid leukemia. (author)

  19. Uranium-Bearing Evaporite Mineralization Influencing Plume Persistence. Literature Review and DOE-LM Site Surveys

    International Nuclear Information System (INIS)

    2016-01-01

    This report on evaporite mineralization was completed as an Ancillary Work Plan for the Applied Studies and Technology program under the U.S. Department of Energy (DOE) Office of Legacy Management (LM). This study reviews all LM sites under Title I and Title II of the Uranium Mill Tailings Radiation Control Act (UMTRCA) and one Decontamination and Decommissioning site to provide (1) a summary of which sites have evaporite deposits, (2) any available quantitative geochemical and mineralogical analyses, and (3) references to relevant reports. In this study, 'evaporite' refers to any secondary mineral precipitate that occurs due to a loss of water through evaporative processes. This includes efflorescent salt crusts, where this term refers to a migration of dissolved constituents to the surface with a resulting salt crust, where 'salt' can refer to any secondary precipitate, regardless of constituents. The potential for the formation of evaporites at LM sites has been identified, and may have relevance to plume persistence issues. Evaporite deposits have the potential to concentrate and store contaminants at LM sites that could later be re-released. These deposits can also provide a temporary storage mechanism for carbonate, chloride, and sulfate salts along with uranium and other contaminants of concern (COCs). Identification of sites with evaporites will be used in a new technical task plan (TTP), Persistent Secondary Contaminant Sources (PeSCS), for any proposed additional sampling and analyses. This additional study is currently under development and will focus on determining if the dissolution of evaporites has the potential to hinder natural flushing strategies and impact plume persistence. This report provides an initial literature review on evaporites followed by details for each site with identified evaporites. The final summary includes a table listing of all relevant LM sites regardless of evaporite identification.

  20. Uranium-Bearing Evaporite Mineralization Influencing Plume Persistence. Literature Review and DOE-LM Site Surveys

    Energy Technology Data Exchange (ETDEWEB)

    None, None

    2016-05-01

    This report on evaporite mineralization was completed as an Ancillary Work Plan for the Applied Studies and Technology program under the U.S. Department of Energy (DOE) Office of Legacy Management (LM). This study reviews all LM sites under Title I and Title II of the Uranium Mill Tailings Radiation Control Act (UMTRCA) and one Decontamination and Decommissioning site to provide (1) a summary of which sites have evaporite deposits, (2) any available quantitative geochemical and mineralogical analyses, and (3) references to relevant reports. In this study, “evaporite” refers to any secondary mineral precipitate that occurs due to a loss of water through evaporative processes. This includes efflorescent salt crusts, where this term refers to a migration of dissolved constituents to the surface with a resulting salt crust, where “salt” can refer to any secondary precipitate, regardless of constituents. The potential for the formation of evaporites at LM sites has been identified, and may have relevance to plume persistence issues. Evaporite deposits have the potential to concentrate and store contaminants at LM sites that could later be re-released. These deposits can also provide a temporary storage mechanism for carbonate, chloride, and sulfate salts along with uranium and other contaminants of concern (COCs). Identification of sites with evaporites will be used in a new technical task plan (TTP), Persistent Secondary Contaminant Sources (PeSCS), for any proposed additional sampling and analyses. This additional study is currently under development and will focus on determining if the dissolution of evaporites has the potential to hinder natural flushing strategies and impact plume persistence. This report provides an initial literature review on evaporites followed by details for each site with identified evaporites. The final summary includes a table listing of all relevant LM sites regardless of evaporite identification.

  1. Phurcalite and others secondary uranium minerals from Perus, Sao Paulo, Brazil

    International Nuclear Information System (INIS)

    Atencio, D.

    1991-01-01

    Phurcalite has been found filling fractures in the tourmaline-bearing granitic pegmatite of Perus, in the north-west part of Sao Paulo city, Brazil. It forms aggregates of radiating euhedral crystals up to 5 mm in length. The crystals are bright yellow, transparent and display vitreous to adamantine lustre. Its streak is pale yellow. Phurcalite is brittle, with a conchoidal fracture, and non-fluorescent. The crystal structure of phurcalite has been solves by single-crystal x-ray diffraction methods and refined to R = 3.8% using 2065 observed [I > 3σ(I)] reflections. The structure consists of [(U O 2 ) 3 O 2 (P O 4 ) 2 4n- ] n layers, parallel to (010), connected by Ca 2+ ions and H 2 O. The coordination polyhedra are: for U(1) hexagonal bi pyramid; for U(2) and U(3) pentagonal bi pyramids; for Ca(4) and Ca(5) capped trigonal prism and triangulated dodecahedron, respectively; and for P(6) and P(7) tetrahedra. As a consequence of this work, the molecular formula of phurcalite previously reported as Ca 2 (U O 2 ) 3 (P O 4 ) 2 (OH) 4 .4 H 2 O must be changed to Ca 2 (U O 2 ) 3 O 2 (P O 4 ) 2 .7 H 2 O. Other secondary uranium minerals associated with Perus phurcalite are autunite, torbernite, meta-autunite, meta-torbernite, chernikovite, meta-uranocircite I, phosphuranylite, uranophane-alpha, uranophane-beta, haiweeite, barian week site and perhaps also bassetite, meta-tyuyamunite and meta-haiweeite. Opal, tridymite, cristobalite, secondary quartz, saponite and rhodochrosite occur associated to the uranium minerals. (author)

  2. Mineral development prospects of the Indochina area: Potential exceeds problems

    Energy Technology Data Exchange (ETDEWEB)

    Clark, A L; Dorian, J P; Hudders, W A [East-West Center, Honolulu, HI (United States)

    1991-02-01

    Reform is under way in several nations within the Indochina area to stimulate economic growth and foreign investment. Though once forbidden, participation by foreign companies in mining exploration and development activities in Myanmar, Kampuchea, Laos, Thailand and Vietnam is now being solicited by the respective governments. This paper presents a preliminary evaluation of mineral and energy resources in the region and outlines possible development scenarios based on economic policies, financial and infrastructural constraints and industry interest. The investment climates for resource-related projects are assessed qualitatively by country. Clearly, the long-term development potential of mineral and energy resources in the Indochina area is large, and the potential gains outweigh any of today's problems. (author). 34 refs, 1 fig., 12 tabs.

  3. Mortality from Circulatory System Diseases among French Uranium Miners: A Nested Case-Control Study.

    Science.gov (United States)

    Drubay, Damien; Caër-Lorho, Sylvaine; Laroche, Pierre; Laurier, Dominique; Rage, Estelle

    2015-05-01

    A significant association has been observed between radon exposure and cerebrovascular disease (CeVD) mortality among French uranium miners, but risk factors for circulatory system diseases (CSD) have not been previously considered. We conducted new analyses in the recently updated (through 2007) French cohort of uranium miners (n = 5,086), which included 442 deaths from CSD, 167 of them from ischemic heart disease (IHD) and 105 from CeVD. A nested case-control study was then set up to collect and investigate the influence of these risk factors on the relationships between mortality from CSD and occupational external gamma ray and internal ionizing radiation exposure (radon and long-lived radionuclides) in this updated cohort. The nested case-control study included miners first employed after 1955, still employed in 1976 and followed up through 2007. Individual information about CSD risk factors was collected from medical files for the 76 deaths from CSD (including 26 from IHD and 16 from CeVD) and 237 miners who had not died of CSD by the end of follow-up. The exposure-risk relationships were assessed with a Cox proportional hazard model weighted by the inverse sampling probability. A significant increase in all CSD and CeVD mortality risks associated with radon exposure was observed in the total cohort [hazard ratios: HRCSD/100 working level months (WLM) = 1.11, 95% confidence interval (1.01; 1.22) and HRCeVD/100 WLM = 1.25 (1.09; 1.43), respectively]. A nonsignificant exposure-risk relationship was observed for every type of cumulative ionizing radiation exposure and every end point [e.g., HRCSD/100WLM = 1.43 (0.71; 2.87)]. The adjustment for each CSD risk factor did not substantially change the exposure-risk relationships. When the model was adjusted for overweight, hypertension, diabetes, hypercholesterolemia and smoking status, the HR/100WLM for CSD, for example, was equal to 1.21 (0.54; 2.75); and when it was adjusted for risk factors selected with the

  4. Doses resulting from intrusion into uranium tailings areas

    International Nuclear Information System (INIS)

    Walsh, M.L.

    1986-02-01

    In the future, it is conceivable that institutional controls of uranium tailings areas may cease to exist and individuals may intrude into these areas unaware of the potential radiation hazards. The objective of this study was to estimate the potential doses to the intruders for a comprehensive set of intrusion scenarios. Reference tailings areas in the Elliot Lake region of northern Ontario and in northern Saskatchewan were developed to the extent required to calculate radiation exposures. The intrusion scenarios for which dose calculations were performed, were categorized into the following classes: habitation of the tailings, agricultural activities, construction activities, and recreational activities. Realistic exposure conditions were specified and annual doses were calculated by applying standard dose conversion factors. The exposure estimates demonstrated that the annual doses resulting from recreational activities and from construction activities would be generally small, less than twenty millisieverts, while the habitational and agricultural activities could hypothetically result in doses of several hundred millisieverts. However, the probability of occurrence of these latter classes of scenarios is considered to be much lower than scenarios involving either construction or recreational activities

  5. Reconnaissance of promising areas for sandstone type uranium deposits in the Urmia-Naqadeh-Mahabad basin, NW Iran

    Directory of Open Access Journals (Sweden)

    Mohammad Reza Hezareh

    2018-04-01

    Full Text Available Introduction The Urmia-Naqadeh-Mahabad basin is a part of the south and west Urmia Lake drainage basin that covers some parts of East-and-West Azerbaijan and northern Kurdistan. This study is the integration of geological, hydrological, remote sensing, geochemical and airborne geophysical data classifying promising areas that are related to sandstone type uranium (U mineralization in Iran. Based on positive factors such as favorable source, host rocks and suitable hydrological pattern, this basin is a favorable basin in Iran. According to the characteristics of lithology, tectonic, sedimentary environment, geotectonics and etc. the basin could be classified into favorable, promising and possible subbasins for mineralization of U sandstone type. Material and methods Geological data show that this region is a part of the Sanandaj-Sirjan zone and consists of Precambrian metamorphic rocks which are covered by younger sedimentary and volcano-sedimentary rocks that are influenced by different metamorphic phases. More than 7597 stream sediment samples from the area have been analyzed for Se،V، Mo، As،Cu، Ag، Zn، Co، Ni، Pb، Ti، Th، Zr، P and Sn. The basin is divided into 11 individual sub-basins. Radiometric data of the basin have been acquisitioned during 1976-1978 by an Australian-German- French Company with line separation of 500 meters and 120 meters of nominal terrain clearance. Remote sensing data reveals that the western subbasin is suitable for sandstone type uranium mineralization. Based on geochemical evidences, the Au, Zn, Sn, As and Pb elements were enriched. Geophysical investigation reveals that the Eastern basin includes high amounts of U and low amounts of Th. Hydrogeological study demonstrates that the trend of groundwater is from the west to the east. Geochemical data revealed that we can divide the basin into 11 subbasins which are characterized as follows: 1. Ghara Aghaj (126 Km2, North to south trend is situated at the

  6. The use of room temperature phosphorescence for the determination of uranium in tin-tailings mineral samples

    International Nuclear Information System (INIS)

    Meor Yusof bin Meor Sulaiman

    1988-01-01

    The possibility of using phosphorescence technique in determining uranium in mineral samples and its comparison with that of fluorescence using high carbonate flux is presented. Samples used are tin-tailings mineral such as monazite, xenotime, ilmenite and zircon. The calibration graph obtained shows a linear relationship between the concentration range of 0-55 ppm U. From here, analysis of the standard showed that the result obtained and that of the certified value are consistent. HN0 3 :H 2 SO 4 (1:3) and phosphoric acid leaching methods are tried and the results show that phosphoric acid is the better method for phosphate mineral. Comparison of the results obtained from this technique and that of the direct and extraction methods of fluorimetry are also made. Phosphorescence is found to be a better method in determining uranium in this type of samples. (author)

  7. Aluminium phosphate sulphate minerals (APS) associated with proterozoic unconformity-type uranium deposits: crystal-chemical characterisation and petrogenetic significance

    International Nuclear Information System (INIS)

    Gaboreau, St.

    2005-01-01

    Aluminium phosphate sulfate minerals (APS) are particularly widespread and spatially associated with hydrothermal clay alteration in both the East Alligator River Uranium Field (Northern Territory, Australia) and the Athabasca basin (Saskatchewan, Canada), in the environment of proterozoic unconformity-related uranium deposits (URUD). The purpose of this study is both: 1) to characterize the nature and the origin of the APS minerals on both sides of the middle proterozoic unconformity between the overlying sandstones and the underlying metamorphic basement rocks that host the uranium ore bodies, 2) to improve our knowledge on the suitability of these minerals to indicate the paleo-conditions (redox, pH) at which the alteration processes relative to the uranium deposition operated. The APS minerals result from the interaction of oxidising and relatively acidic fluids with aluminous host rocks enriched in monazite. Several APS-bearing clay assemblages and APS crystal-chemistry have also been distinguished as a function of the distance from the uranium ore bodies or from the structural discontinuities which drained the hydrothermal solutions during the mineralisation event. One of the main results of this study is that the index mineral assemblages, used in the recent literature to describe the alteration zones around the uranium ore bodies, can be theoretically predicted by a set of thermodynamic calculations which simulate different steps of fluid-rock interaction processes related to a downward penetrating of hyper-saline, oxidizing and acidic diagenetic fluids through the lower sandstone units of the basins and then into the metamorphic basement rocks. The above considerations and the fact that APS with different crystal-chemical compositions crystallized in a range of fO 2 and pH at which uranium can either be transported in solution or precipitated as uraninite in the host-rocks make these minerals not only good markers of the degree of alteration of the

  8. Leaching Characteristics of Uranium And Copper from Their Mineralization in the Carbonate Rich latosol of Abu-Thor Locality, South Western Sinai, Egypt

    International Nuclear Information System (INIS)

    El-Sheikh, E.M.; Ghazala, R.A.; Abdelwarith, A.; Salem, F.; Ali, S.

    2015-01-01

    The chemical processing of the poly-mineralized carbonate rich latosol ore occurring at Abu-Thor locality of south western Sinai area has been studied for the recovery of uranium and copper metal values. A technological sample assaying 700 ppm U and 9.7% Cu was collected. In the present study, two successive percolation leaching procedures were performed after determination of optimum leaching factors by agitation leaching process. The first was carried out for uranium recovery by using urea as organic leaching agent which was possible to achieve leaching efficiency exceeding 90.3%. This procedure was followed by a second one for copper recovery using ammonium hydroxide solution and ammonium carbonate. The obtained dissolution efficiency was about 93%. The leached metal values namely U and Cu from the studied ore were then extracted as marketable products in the form of ammonium diuranate and copper sulphate, respectively.

  9. Mineralogical-geochemical specificity of the uranium mineralization superposed on the oxidized rocks

    International Nuclear Information System (INIS)

    Bulatov, S.G.; Shchetochkin, V.N.

    1975-01-01

    Taking as an example a uranium deposit connected with oxidation zones developing along the strata, the author examines the mineralogical and geochemical features of a pitchblende-sooty uraninite mineralization superimposed on limonitized sandstones. The typical relations between ore mineralization with new formations of the infiltration oxidation process and the changes caused by the action of rising thermal solutions on the rocks are given. Based on these relations, two generations of different ages of rich pitchblende-sooty uraninite ores are distinguished, separated by the time of development of the oxidation processes. The typical change around the ore is a reduction of limonitized rocks, accompanied by their pyritization, clarification and hematitization. The ore concentrations were formed as a result of the action of rising thermal solutions that had interacted with oxidized rocks. The development of late oxidation processes caused the redistribution of these ore concentrations and their downward shift along the stratum slope following the limonitization boundary. On the basis of the data presented, comments of a forecasting and prospecting nature are made. (author)

  10. Lung cancer mortality among nonsmoking uranium miners exposed to radon daughters

    International Nuclear Information System (INIS)

    Roscoe, R.J.; Stenland, K.; Halperin, W.E.; Waxweiler, R.J.

    1990-01-01

    This paper reports on radon daughters, both in the workplace and in the household, that are a continuing cause of concern because of the well-documented association between exposure to radon daughters and lung cancer. To estimate the risk of lung cancer mortality among nonsmokers exposed to varying levels of radon daughters, 516 white men who never smoked cigarettes, pipes, or cigars were selected from the U.S. Public Health Service cohort of Colorado Plateau uranium miners and followed up from 1950 through 1984. Age-specific mortality rates for nonsmokers from a study of U.S. veterans were used for comparison. Fourteen deaths from lung cancer were observed among the nonsmoking miners, while 1.1 deaths were expected, yielding a standardized mortality radio of 12.7 with 95% confidence limits of 8.0 and 20.1. These results confirm that exposure to radon daughters in the absence of cigarette smoking is a potent carcinogen that should be strictly controlled

  11. Uranium

    International Nuclear Information System (INIS)

    Anon.

    1984-01-01

    The article briefly discusses the Australian government policy and the attitude of political party factions towards the mining and exporting of the uranium resources in Australia. Australia has a third of the Western World's low-cost uranium resources

  12. Uranium

    International Nuclear Information System (INIS)

    Mackay, G.A.

    1978-01-01

    The author discusses the contribution made by various energy sources in the production of electricity. Estimates are made of the future nuclear contribution, the future demand for uranium and future sales of Australian uranium. Nuclear power growth in the United States, Japan and Western Europe is discussed. The present status of the six major Australian uranium deposits (Ranger, Jabiluka, Nabarlek, Koongarra, Yeelerrie and Beverley) is given. Australian legislation relevant to the uranium mining industry is also outlined

  13. Uranium

    International Nuclear Information System (INIS)

    1982-01-01

    The development, prospecting, research, processing and marketing of South Africa's uranium industry and the national policies surrounding this industry form the headlines of this work. The geology of South Africa's uranium occurences and their positions, the processes used in the extraction of South Africa's uranium and the utilisation of uranium for power production as represented by the Koeberg nuclear power station near Cape Town are included in this publication

  14. Recovery of an area degraded by uranium mining using phytoremediation

    International Nuclear Information System (INIS)

    Fonseca, Gustavo; Barreto, Helder M.; Pereira, Wagner de S.; Goncalves, Cyntia C.; Oliveira, Gabriela T. de; Pereira, Wagner de S.; Kelecom, Alphonse

    2011-01-01

    Environmental contamination caused by uranium mining is a widespread problem throughout the world, with serious implications. The goal of the remediation actions is to reduce environmental risks and to protect the health of exposed populations. This can be done by removing or reducing the sources or the critical exposure pathways. This remediation is achieved by physical, chemical and biological methods. Among the biological ones phyto remediation is considered the most simple and the cheapest way to remedy contaminated soils. The phyto remediation can act in different ways: Phyto stabilization, phyto degradation, phyto volatilization, rhizodegradation and phyto hydraulics. An important factor in phyto remediation is the bioavailability of radionuclides, which depends on the radionuclide itself, on the time of deposition and on soil characteristics. This paper proposes a strategy of phyto remediation for the unit of ore processing situated at Caldas, MG, BR which is an agricultural area, and the use of land for crops production is, hence, a critical exposure pathway to human. To block this exposure pathways a phyto remediation process was idealized based on the creation of a forest that will be used as an area of permanent preservation (Brazilian legislation term which prevents the use of land for any purpose other than the maintenance of the forest). The main requirement for this type of preservation area is the use of native trees. Thus, a survey of trees native to the region and available in three nearby forest gardens was carried out. The time of flowering, fruiting, ways to break dormancy of seeds and care for the production of seedlings and planting in the field were surveyed. Based on this study, the extension of the area to be covered and the species to be used could be defined. (author)

  15. Recovery of an area degraded by uranium mining using phytoremediation

    Energy Technology Data Exchange (ETDEWEB)

    Fonseca, Gustavo [Fundacao de Ensino Octavio Bastos (UNIFEOB), Sao Joao da Boa Vista, SP (Brazil); Barreto, Helder M. [Faculdades Pitagoras, Pocos de Caldas, MG (Brazil). Curso de graduacao em Engenharia de Producao; Pereira, Wagner de S.; Goncalves, Cyntia C.; Oliveira, Gabriela T. de, E-mail: wspereira@inb.gov.br, E-mail: delcy@inb.gov.br [Industrias Nucleares do Brasil (UTM/INB), Pocos de Caldas, MG (Brazil). Unidade de Tratamento de Minerios; Pereira, Wagner de S. [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Instituto de Biologia. Laboratorio de Radiobiologia e Radiometria Pedro Lopes dos Santos; Kelecom, Alphonse [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Programa de Pos-Graduacao em Ciencia Ambiental

    2011-07-01

    Environmental contamination caused by uranium mining is a widespread problem throughout the world, with serious implications. The goal of the remediation actions is to reduce environmental risks and to protect the health of exposed populations. This can be done by removing or reducing the sources or the critical exposure pathways. This remediation is achieved by physical, chemical and biological methods. Among the biological ones phyto remediation is considered the most simple and the cheapest way to remedy contaminated soils. The phyto remediation can act in different ways: Phyto stabilization, phyto degradation, phyto volatilization, rhizodegradation and phyto hydraulics. An important factor in phyto remediation is the bioavailability of radionuclides, which depends on the radionuclide itself, on the time of deposition and on soil characteristics. This paper proposes a strategy of phyto remediation for the unit of ore processing situated at Caldas, MG, BR which is an agricultural area, and the use of land for crops production is, hence, a critical exposure pathway to human. To block this exposure pathways a phyto remediation process was idealized based on the creation of a forest that will be used as an area of permanent preservation (Brazilian legislation term which prevents the use of land for any purpose other than the maintenance of the forest). The main requirement for this type of preservation area is the use of native trees. Thus, a survey of trees native to the region and available in three nearby forest gardens was carried out. The time of flowering, fruiting, ways to break dormancy of seeds and care for the production of seedlings and planting in the field were surveyed. Based on this study, the extension of the area to be covered and the species to be used could be defined. (author)

  16. On the possibilities of occurrence of structure controlled unconformity-proximal uranium mineralization in Madhawanpalli - Rayalgandi Sector, Srisailam Sub-Basin, Cuddapah Basin, Andhra Pradesh

    International Nuclear Information System (INIS)

    Parashar, K.K.; Srivastava, S.K.; Mukundhan, A.R.; Ramesh Kumar, K.; Achar, K.K.

    2012-01-01

    The northern margin of Srisailam Sub-basin is well known for its potential to host unconformity proximal uranium mineralization and so far three deposits have been established at Lambapur, Peddagattu and Chitrial. Recent exploration in Madhawanpalli-Rayalgandi sector and follow up sub-surface exploration has indicated uranium mineralization in the granites beneath the cover of Srisailam sediments. The host rock is characterized by intense fracturing, brecciation, cataclasism and alterations like chloritization, illitization and silicification signifying the role of basement structures in uranium mineralization near the unconformity surface. (author)

  17. Occupational disease disclosed by preventive follow-up of former uranium ore miners

    International Nuclear Information System (INIS)