Geochemical exploration models for sedimentary uranium deposits
Sedimentary terranes The existence of regional uranium enrichments in association with deposits in sedimentary rocks is documented by several workers. The Wyoming roll-type U deposits are associated with the U-rich granites of the Granite Mountains, which contained 10--20 ppm U before loss of major proportions of their uranium during Late ...
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Groundwater processes and sedimentary …
Among uranium deposits in sedimentary basins, sandstone-type uranium deposits are epigenetic. The development scales of sandstone-type uranium deposits are controlled by tectonic events ...
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Geology of Uranium Deposits in Colorado
Uranium is soluble in oxidizing aqueous solutions, especially the U+6 valence state, and can be redistributed from primary source rocks into porous sedimentary rocks and structures by groundwater and form secondary (epigenetic) uranium mineral deposits. Epigenetic deposits of uranium in sedimentary rocks form the bulk of uranium deposits in ...
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Geology of uranium deposits
Uranium is typically enriched in the most silicic magmatic rocks such as granites and rhyolites (up to several tens to hundreds of ppm) and in sedimentary rocks rich in organic …
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Diversity of uranium deposits in China
Uranium is an element that can be active in various geological environments and can be accumulated to form mineral deposits of economic significance at conditions ranging from magmatic, metamorphic, hydrothermal, sedimentary to near-surface, resulting in an extreme diversity of uranium deposits (Cuney, 2009).The classification of uranium deposits has been …
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Ore-Forming Biogenic Factor in the Formation of Sandstone-Type Uranium
Uranium ores form as a result of oxidation of sedimentary deposits by ground-layer water bearing oxygen and uranium. Sandstone uranium deposits, according to the IAEA classification ( Geological Classification …, 2018), are represented by the following subtypes: (1) basal-channel, (2) tabular, (3) roll-front, (4) tectonic-lithologic and (5 ...
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Classification of Sandstone-Related Uranium Deposits
Sandstone type deposits are the most common type of uranium deposits in the world. A large variety of sub-types have been defined, based either on the morphology of the deposits (e.g., tabular, roll front, etc), or on the sedimentological setting (e.g., paleovalley, paleochannel, unconformity), or on tectonic or lithologic controls (e.g., tectonolithologic, mafic …
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Genesis of sandstone-type uranium deposits along the …
Mesozoic to Cenozoic sandstone-type uranium deposits belonging to continental sedimentary basins show variable size range (Wang et al., 2011).Due to their large scale, low mining cost, and environmental-friendly mining process, these leachable sandstone-type U mineral resources have become one of the important sources for the world's nuclear energy …
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Uranium Unconformity Deposits | Geology for Investors
Nearly all deposits are closely associated with fault systems, which play a major role in the ore-forming process by providing a conduit for fluids to cross the unconformity. Uranium deposits occurring at or near an unconformity between basin sedimentary rocks and basement metamorphic rocks.
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Tectono-Sedimentary Evolution of the Uranium Deposits in …
Tectono-Sedimentary Evolution of the Uranium Deposits in the … 653 (Sahara alger ien) au cours du Car bonifere; do nnees paleocli matiques. Bulletin de la Soci é t é G é ologiq ue de France ...
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Geometallurgy of Australian uranium deposits
Gypsum may be present in the gangue mineralogy of uranium deposits that form in sedimentary environments under arid climate conditions (e.g. surficial calcrete deposits). The presence of gypsum is a processing hindrance when an alkaline leach solution is used as it reacts to precipitate calcium carbonate and form sodium sulphate in solution ...
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Australian Uranium Deposits
Most of Australia's uranium resources are in two kinds of orebodies, unconformity-related and breccia complex, while sedimentary deposits are less significant than overseas. Uranium deposits world-wide can be grouped into 14 major categories of deposit types based on the geological setting of the deposits (OECD/NEA & IAEA, 1996).
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Groundwater processes and sedimentary uranium …
tary uranium deposits: syngenetic, syndiagenetic, and epigenetic. In each case, the basic sedimentary uranium-enrichment cycle involves: (1) leaching or erosion of uranium from a low-grade provenance; (2) transport of uranium by surface or groundwater flow; and (3) concentration of uranium by mechanical, geochemical, or physiochemical processes ...
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Uranium (U) Ore | Minerals, Formation, Occurrence, Deposits
Sedimentary basins: Uranium deposits hosted in sandstone formations are often found in sedimentary basins. These basins are typically characterized by layers of sedimentary rocks, such as sandstone, shale, and limestone, that have accumulated over millions of years. Groundwater, enriched with uranium, can migrate through these sedimentary rocks ...
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Classification of Sandstone-Related Uranium Deposits
A large variety of sub-types have been defined, based either on the morphology of the deposits (e.g., tabular, roll front, etc), or on the sedimentological setting (e.g., paleovalley, …
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Organic geochemistry of sedimentary uranium ore deposits
In many sedimentary uranium deposits, close relationships between uranium and organic matter can be observed. They may be statistical, spatial or chemical. Such relationships entitle the organic matter to be considered as an accurate marker of the history of uranium deposits. Geochemical analyses of organic matter in uranium deposits often ...
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Geology and concepts of genesis of important types of …
Uranium ore deposits occur in nearly every major rock type in the earth's crust, and nearly all igneous, metamorphic, and sedimentary processes are capable of concentrating or dispersing …
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Metallogenic characteristics and models of sandstone-type uranium …
Uranium deposit formation Lithology of uranium reservoirs Sedimentary faces Reserve size Uranium ore type ... From the perspective of sedimentary system, uranium deposits are mostly developed near the location where river channels and channel bars are overlaid or river channels are divaricated, or near the barriers at the roof and floor of a ...
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Geochemical exploration models for sedimentary uranium deposits
Most uranium deposits in sedimentary rocks are associated with geochemical provinces enriched in U and Th or with U-rich intrusives or volcanic rocks. However, the deposits may be separated from these U-rich source rocks by tens of kilometers or more. Weak regional U and Th anomalies in sediments containing U deposits are found in the Catskill ...
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Classification of Sandstone-Related Uranium …
Although a succession of concentration steps, potentially temporally-disconnected, are involved in the genesis of some uranium mineralization, the classification here proposed will focus on the main mechanisms responsible for …
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Association of large sandstone uranium deposits with …
Sandstone uranium deposits account for approximately 30% of annual global production, largely through in situ leach (ISL) mining. Most of this production has come from deposits in the western
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Uranium Deposits in Tertiary Sedimentary Rocks in …
URANIUM DEPOSITS IN TERTIARY SEDIMENTARY ROCKS IN WYOMING AND NORTHERN COLORAD SYSTEM FORMATION CHARACTER Pliocene{? ) North Park formation Tuff, sandstone. and bentonitic claystone Miocene{? ) Browns Park formation Sandstone. tuffaceous. conglomerate, and marl ~ Oligocene White River formation Claystone. tuffaceous.
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3D Geological Modeling and Metallogenic Prediction of …
Sandstone-type uranium deposits hold significant value and promise within China's uranium resource portfolio, with the majority of these deposits found at the junctions of basins and mountains within Mesozoic and Cenozoic basins. The Kamust uranium mining area, located in the eastern part of the Junggar Basin, represents a significant recent discovery. Prior …
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(PDF) Primary uranium sources for sedimentary-hosted uranium deposits …
Miner Deposita DOI 10.1007/s00126-016-0661-0 ARTICLE Primary uranium sources for sedimentary-hosted uranium deposits in NE China: insight from basement igneous rocks of the Erlian Basin Christophe Bonnetti 1,2 & Michel Cuney 1 & Sylvain Bourlange 1 & Etienne Deloule 3 & Marc Poujol 4 & Xiaodong Liu 2 & Yunbiao Peng 5 & Jianxing Yang 5 Received: 14 May …
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The roles of organic matter in the formation of uranium deposits …
Black shale deposits The widest spread and lowest grade sedimentary uranium deposits are the organic-rich black shale deposits. Examples of black shale uranium deposits include the Ranstad Shale of Sweden and the Chat- tanooga and the New Albany Shales of the USA (Swanson, 1956; Nash et al., 1981). Typically these deposits contain only 2 to 4 ...
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Notes on the Geology of Uranium
Weathering and sedimentary processes may either disperse or concentrate uranium, depending primarily on climate. Some primary and relatively insoluble uranium minerals accumulate in …
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Identification of the Sedimentary Sources and Origin of Uranium …
The large-sized Tarangaole uranium deposit and its neighboring Daying and Nalinggou deposits, located in the northeastern margin of the Ordos Basin, constitutes a major uranium resource base in northern China. In order to further clarify the sedimentary material source, uranium source and regional sediment–tectonic setting of the uranium-fed clastic rocks …
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Geology and concepts of genesis of important types of uranium deposits
Uranium ore deposits occur in nearly every major rock type in the earth's crust, and nearly all igneous, metamorphic, and sedimentary processes are capable of concentrating or dispersing uranium. However, only three types of deposits account for more than 70 percent of known Western World Reasonably Assured Resources (WWRAR): Precambrian quartz-pebble …
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Uranium Deposits
Uranium deposits in Mongolia can be classified based on IAEA classification scheme ... The Dulaan Uul is the sedimentary deposit formed in relation to the Upper Cretaceous Sainshand Formation. This formation has non-permeable thin argillaceous layers dominated by sand units of uneven thickness. It can be divided into U0-U3 layers.
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Uranium Deposits
Exploration for uranium. Kurt Kyser, in Uranium for Nuclear Power, 2016. 3.6.4 Sedimentology. Most uranium deposits in sedimentary rocks are associated with geochemical provinces enriched in U and Th or with U-rich intrusives or volcanic rocks, although the deposits may be separated by tens of kilometers from these source rocks. However, weak regional U and Th anomalies in …
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