 | | Journal (article/letter/editorial) | | uraninite in the natural fission reactors in Gabon J. ‘Department JANECZEK’ and R. C. EWING’ ‘Faculty of...uranium ore from the natural fission reactors in Gabon were studied by detailed electron microprobe analysis...Ru. INTRODUCTION it has also been recognized at Oklo (Havette et al., 1975; Lancelot et al., 1975; Devillers...loss from uraninite, the U-P\, ages of U ore at Oklo range from 1780 Ma to 2050 Ma (Naudet, 1991). A...1993b). The major episode of Pb mobilization at Oklo has been related to the intrusion of a dolerite |  | | Journal (article/letter/editorial) | | Laboratory for Experimental Aqueous Geochemistry, Department of Geology and Geological Engineering, UniÕersity...sulfide, such as ReS 2 in solid solution in molybdenite ŽMorris, 1969., then oxidation–reduction reactions...investigations. Use of the Re–Os system to date molybdenite is increasingly attracting the interest of both...economic geologists and geochronologists because molybdenite is a frequently encountered ore mineral in hydrothermal...discovered that some ages obtained from the molybdenite geochronometer are not concordant with those |  | | Journal (article/letter/editorial) | | fissiogenicREEs from a natural fission reactor at Bangomb6,Gabon hxusz JlNsczrrt .nxoRonNrv C. Ewrxc2 'Faculty of...deposits of the Franceville Basin in southeastern Gabon at approximately2 Ga andlasted 105-106yr, producinga...fission-reactor zones have been discovered in the U deposit at Oklo since 1972. Two more reactorsare known at Okelobondo...Okelobondo and Bangomb6, some 0.5 and 20 km south of Oklo, respectively. The Bangomb6 fission reactor, discovered...redistribution of Nd and heavier REEs in reactor zone 2 at Oklo. The REEs migrated <80 cm (Ruffenachet al. 1975) |  | | Journal (article/letter/editorial) | | (25"C, I bar) constraints DOUGLAS G . BROOKINS Department of Geology, The University of New Mexico, Albuquerque...reduction by formation of TcS,. It is noted that at the Oklo natural reactor, The geochemical similarity of Re...diagrams proTc and Mo were transported together at the Oklo vided in this notc (Figs. 1--4) show that nearly...Z = 40 to Z = 52: application to the Oklo natural reactor, Gabon. Chem. Geol. 23,325-342. BROOKINSD. G...(1983b) Migration and retention of elements at the Oklo natural reactor. Environ. Geol. 4, 201-208. BROOKINSD |  | | Journal (article/letter/editorial) | | Implications for the environmental management of mine sites— M.W. Clark, S.R. Walsh, and J.V. Smith APPLIED...Kniewald, and Joseph A. Mandarino Zoned tungstenoan molybdenite from a fenitized megaxenolith in the Khibina...Ni-Cu mineralization at Las Aguilas, San Luis Province, Argentina: Implications for exploration of an...arc—R.G. Skirrow and J.P. Sims The Vazante zinc mine, Minas Gerais, Brazil: Constraints on willemitic...distribution in BIF-derived iron ores of Hamersley Province, Western Australia—R.D. Dukino, B.M. England, |  | Škácha, P., Goliáš, V., Sejkora, J., Plášil, J., Strnad, L., Škoda, R., Ježek, J. (2009) Hydrothermal uranium-base metal mineralization of the Jánská vein, Březové Hory, Příbram, Czech Republic: lead isotopes and chemical dating of uraninite. Journal of GEOsciences, 54 (1) 1-13 | Journal (article/letter/editorial) | | 43 Prague 2, Czech Republic; skachap@volny.cz Department of Mineralogy and Petrology, National Museum...uranium mineralization at the 2nd level of the Prokop mine. Calcite is a common mineral in the museum specimens...galena, Vojtěch mine, vein Protiklonná, 5th level (PR) No 495 J_4 galena, Vojtěch mine, main Vojtěch...th galena 0.8610 fine-grained galena, Štěpán mine, vein Klement, 2nd level (PR) No 1247 J_2 galena...also found in other deposits worldwide, e. g. at Oklo deposit of Proterozoic age (Evins et al. 2005). |  | | Report (issue) | | deposits of Mas Laveyre (France) and Mikouloungou (Gabon). 5 3. Hematite breccia complex deposits: Deposits...activities include drilling and coring to complete final mine plans and establish final processing flowsheets...case of an underground mine or overburden stripping in the case of an open pit mine, mill construction,...direction and dips south at 15–30º. In the Main Mine Series the ore zone is up to 35m thick. Jabiluka...open to the south and east at depth. In the Main Mine Series the ore zones are up to 135m thick. The metasedimentary |  | Molnár, Ferenc, Oduro, Harry, Cook, Nick D. J., Pohjolainen, Esa, Takács, Ágnes, O’Brien, Hugh, Pakkanen, Lassi, Johanson, Bo, Wirth, Richard (2016) Association of gold with uraninite and pyrobitumen in the metavolcanic rock hosted hydrothermal Au-U mineralisation at Rompas, Peräpohja Schist Belt, northern Finland. Mineralium Deposita, 51 (5) 681-702 doi:10.1007/s00126-015-0636-6 | Journal (article/letter/editorial) | | Mawson Resources Ltd., Vancouver, BC, Canada 4 Department of Mineralogy, Eötvös Loránd University, Budapest...maldonite, pyrite, pyrrhotite, chalcopyrite, molybdenite and titanite. Raman spectra show disordered structure...Suurikuusikko deposit (also known as Kittilä gold mine, currently Europe’s largest gold producer). The...assemblages (Fig. 2e, f). Pbbearing maldonite (Au2Bi), molybdenite, cobaltite, pyrrhotite, pentlandite, pyrite and...irregular patches in larger nickeline grains. Molybdenite flakes are commonly attached to the surface of |  | | Journal (article/letter/editorial) | | around the Oklo–Okélobondo and Bangombé natural nuclear reaction zones (Franceville basin, Gabon)—Régis Mathieu...at the Zenith deposit, Southwestern Grenville Province, Renfrew area, Ontario, Canada—S. Salvi 77 CONTRIBUTIONS...Carbonate-mineral/water interactions in sulfide-rich mine tailings— Tom A. Al, Chris J. Martin, and David... Application of 3-D seismic to mine planning at Vaal Reef’s gold mine, number 10 shaft, Republic of South...Outokumpu Group—Aimo Hattula and Timo Rekola In-mine seismic delineation of mineralization and rock structure— |  | Kirchenbaur, Maria, Maas, Roland, Ehrig, Kathy, Kamenetsky, Vadim S., Strub, Erik, Ballhaus, Chris, Münker, Carsten (2016) Uranium and Sm isotope studies of the supergiant Olympic Dam Cu–Au–U–Ag deposit, South Australia. Geochimica et Cosmochimica Acta, 180. 15-32 doi:10.1016/j.gca.2016.01.035 | Journal (article/letter/editorial) | | within a granite of the 1.59 Ga Gawler Silicic Province. Emerging evidence indicates that both the breccia...and Weber, 2003), of the type discovered at the Oklo uranium deposit (e.g., Naudet, 1974; Gauthier-Lafaye...with lesser amounts of sphalerite, tennantite, molybdenite, and galena. They are typically fine-grained...volume of the Mesoproterozoic silicic large igneous province (SLIP) magmas of the Gawler Craton (late Archean...this 235U deficit should be observable today. At Oklo, the only known natural nuclear reactor, modern |  | | Report (volume) | | Editors: Peter C. Burns' & Robert Finch 2 1 Department of Civil Engineering and Geological Sciences...Environmental issues such as coping with uranium mine and mill tailings and other uranium-contaminated...and Geochemistry of Natural Fission Reactors in Gabon Janusz Janeczek 8 393 Geomicrobiology of Uranium...and Geochemistry of Natural Fission Reactors in Gabon Janusz Janeczek INTRODUCTION: NATURAL FISSION REACTORS...largest construction projects in the history of the Department of Energy. Approximately three billion dollars |  | | Report (issue) | | UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY PRINCIPAL URANIUM DEPOSITS OF THE WORLD ...Angola, Peoples Republic of........................ Gabon, Republic of................................. Central...Saskatchewan, Canada; the Shinkolobwe, Katanga Province, Zafre; and the medium-sized deposits at Joachymov...Joachymov, Czechoslovakia, and at Schwartzwalder mine, Colorado, U.S.A.). Uranium deposits have been found...Australi a Sweden Spain France Ni ger Argenti na India Gabon Al geri a Yugoslavia Brazil Central African Republic |  | | Journal (issue) | | Jianghshan, Guangdong Province. I have seen others listed as coming from Hebei Province. Regardless of where...4 Fig. 1. Apophyllite, Jianghshan, Guangdong Province, China, photo by Dan Weinrich. neat piece. To...the old classic locality, Morgabal, in Aveyron Department, France. Also, he had small trays holding small...stibnites from a new Nevada locality, the Murray Mine, not the old Manhattan, but he had only three specimens...clear calcites from a small pocket in the Meikle Mine, the new locality for the superb yellow barites |  | | Book | | ........................................... 36 Gabon ..................................................uranium if higher prices justify reprocessing the mine tailings to recover some of the uranium that was...wastewater during environmental reclamation at a mine that has ceased production. The following statistical...was about 270 tU. In Argentina the Sierra Pintada mine had been in standby status since 1999 and was expected...recovered from mine rehabilitation activities; small amounts were likewise recovered during mine remediation |  | | Journal (article/letter/editorial) | | from the same reef (Vaal reef), but not the same mine location. The differences in the ages could be related...obtained from active mine working areas. Areas with high gold grades were targeted in each mine. Samples were...derived from Gold One International's Modder East mine on the East Rand near the town of Springs. The samples...concentrations of the elements with specific reefs of mine locations. Errors for the measurements of lower...of the ores in the three reefs examined from four mine locations. The combination of three previous studies |  | | Report (issue) | | CHAPTER 1: INTRODUCTION Kurt Kyser Department of Geological Sciences and Geological Engineering, Queen’s...engineered. Once an ore deposit is discovered, a mine is developed and U extracted by a variety of mining...Bay Basin in Canada and the Franceville Basin in Gabon, but at the boundary between sandstone and grey...the oldest deposits from the Franceville Basin in Gabon. Some of these latter deposits preserve the effects...gold mining. In Namibia, the large Rössing open cut mine has been in operation since 1976, and currently |  | | Book | | (individual deposit) and regional scale (uranium province). Their ideas, observations, and data have directly...Granite-Related Vein Uranium Deposits: Schwartzwalder Mine, Front Range, USA ................................Uranium Deposits: Shinkolobwe, Katanga Copper Province, Zaire .........................................Deposits in Proterozoic Sandstones: Franceville Basin, Gabon ......................... 224 232 237 246 250 250...when analyzing pitchblende from the George Wagsfort mine at Johanngeorgenstadt, Sachsisches Erzgebirge (Saxonian |  | | Report (issue) | | UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Geology and genesis of major world hardrock....................................44 Grenville Province, Quebeck and Ontario............................orebody.....................39 20. Grenville Province of the Canadian Shield......................46...Saskatchewan.............53 22. Geology of the Rossing mine area...............................55 iii Illustrations...cross section of Verna and Fay orebodies, Eldorado mine................................................ |  | Qiu, Lin-Fei, Li, Xi-De, Liu, Wu-Sheng, Hu, Bao-Qun, Gao, Long, He, Zhong-Bo (2021) Uranium Deposits of Erlian Basin (China): Role of Carbonaceous Debris Organic Matter and Hydrocarbon Fluids on Uranium Mineralization. Minerals, 11 (5) 532 doi:10.3390/min11050532 | Journal (article/letter/editorial) | | southeastern edge of the Central-Asia Uraniferous Province (CAUP). The CAUP is one of the largest metallogenic...inherited sedimentary OM (e.g., Franceville basin, Gabon) [13,14]. It is unclear whether the migrated hydrocarbon...Uraninite (grayish white), pyrite (dark gray), molybdenite(gray) and mobile organic matter(black) coexist...shows Uraninite (yellow), pyrite (light purple), molybdenite (purple) and mobile organic matter(black) coexist...organic matter; Ur: Uraninite; Py: Pyrite; Mo: molybdenite; Cal: calcite; Brt: barite; BSE: Electron backscatter |  | | Journal (article/letter/editorial) | | also typical for these samples. When galena and molybdenite are present in pitchblendes, the Xe,-Xe, method...mineralization was associated with selenite, molybdenite and ga- TABLE III Comparison of U-Pb and Xe...fraction of sample B3, refined from galena and molybdenite admixtures. Deposit C (central Europe) belongs...isotopic anomalies in natural nuclear reactor (Oklo, Gabon). Geochemistry, No. 12 (in Russian). Teitsma |  | Wu, Bin, Bonnetti, Christophe, Liu, Yue, Zhang, Zhan-Shi, Guo, Guo-Lin, Li, Guang-Lai, Hu, Yin-Qiu, Yan, Zhao-Yan (2021) Uraninite from the Guangshigou Pegmatite-Type Uranium Deposit in the North Qinling Orogen, Central China: Its Occurrence, Alteration and Implications for Post-Caledonian Uranium Circulation. Minerals, 11 (7) 729 doi:10.3390/min11070729 | Journal (article/letter/editorial) | | uranium deposit from the Shangdan uraniferous province in the North Qinling Orogenic Belt (NQB) is the...m (DF-8 to DF-12) in the Shangdan uraniferous province (Figure 1c). Then, uraninite grains and radiohalos...apatite, xenotime, rutile, ilmenite, pyrite, molybdenite and galena. In most cases, these accessory minerals...including monazite, zircon, apatite, xenotime and molybdenite (Figure 3b), which show intergrowth relationships...included in quartz. (b) Uraninite associated with molybdenite and calcite along interstices of quartz and K-feldspar |  | Xu, Zhengqi, Yin, Minghui, Chen, Youliang, Xiang, Lu, Song, Hao, Zhang, Chengjiang, Yao, Jian, Guo, Hu (2021) Genesis of Megacrystalline Uraninite: A Case Study of the Haita Area of the Western Margin of the Yangtze Block, China. Minerals, 11 (11) 1173 doi:10.3390/min11111173 | Journal (article/letter/editorial) | | accessory minerals are sphene, apatite, zircon, molybdenite, and pyrite Although most rocks in the area have...accessory minerals are sphene, apatite, zircon, molybdenite, and pyrite ite, pyrite, and minor feldspar (Figure...2b,d,h). Figure 2. (a) Felsic vein (Fv), (b) Molybdenite in felsic vein, (c) Dark idiomorphic mineral...11, 1173 Figure 2. (a) Felsic vein (Fv), (b) Molybdenite in felsic vein, (c) Dark idiomorphic mineral...Mo, Molybdenite; Py, Pyroxene; Am, Amphibole; Ap, Apatite; Sp, Sphene. 5 of gneiss; 19 Molybdenite; Py |  | Molnár, Ferenc, O’Brien, Hugh, Stein, Holly, Cook, Nick (2017) Geochronology of Hydrothermal Processes Leading to the Formation of the Au–U Mineralization at the Rompas Prospect, Peräpohja Belt, Northern Finland: Application of Paired U–Pb Dating of Uraninite and Re–Os Dating of Molybdenite to the Identification of Multiple Hydrothermal Events in a Metamorphic Terrane. Minerals, 7 (9) 171 doi:10.3390/min7090171 | Journal (article/letter/editorial) | | U–Pb Dating of Uraninite and Re–Os Dating of Molybdenite to the Identification of Multiple Hydrothermal...spectroscopy (LA-ICP-MS), and Re–Os dating of molybdenite, indicate that primary hydrothermal uranium mineralization...hydrothermal event is also recorded by Re–Os dating of molybdenite from the gold-bearing Mg-metasomatized metasedimentary...uraninite, we also performed Re–Os dating on molybdenite occurring as an accessory mineral related to...adjacent Palokas system (Figure 2). Re–Os dating of molybdenite is a particularly robust tool for dating hydrothermal |  | | Journal (article/letter/editorial) | | ALLEGRE:Behavior of the rare earth elements in the Oklo natural reactor R. 0. JAMESand M. G. M\CNAL:GHTON:The...the Sudbury Nickel Irruptive and the Superior Province granites north of Sudbury . . . . . , . . . ....Appalachian belt acetate ion, effect on orthopyroxene acid mine drainage, Susquehanna River acidic springs, sulfur...F-Fe2 * avoidance in silicates _ . . . fission, Oklo aatural reactor . . . . . fission tracks, U in phosphorite.... functional groups. humic polymers. s . Gaban, Oklo ore deposit . . _ . gafena, Red Sea geothermal system |  | Yuan, Feng, Jiang, Shao-Yong, Liu, Jiajun, Zhang, Shuai, Xiao, Zhibin, Liu, Gang, Hu, Xiaojia (2019) Geochronology and Geochemistry of Uraninite and Coffinite: Insights into Ore-Forming Process in the Pegmatite-Hosted Uraniferous Province, North Qinling, Central China. Minerals, 9 (9) 552 doi:10.3390/min9090552 | Journal (article/letter/editorial) | | Ore-Forming Process in the Pegmatite-Hosted Uraniferous Province, North Qinling, Central China Feng Yuan 1 , Shao-Yong...low-grade, large-tonnage pegmatite-hosted uraniferous province. Uraninite is predominant and ubiquitous ore mineral...Guangshigou biotite pegmatites in this uraniferous province reveal the primary magmatic U mineralization and...timing of U mineralization in the uraniferous province was constrained at 407–415 Ma, confirming an Early...composition; Shangdan pegmatite-hosted uraniferous province 1. Introduction There is an increased demand |
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