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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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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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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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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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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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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Sandstone type uranium deposits in the Ordos Basin, Northwest China…

The uranium deposits in China can be classified into four major categories (Table 1), namely: 1) magmatic, 2) hydrothermal veins; 3) continental sedimentary and 4) marine sedimentary.Uranium deposits of all these four types account for about 90% of the resource potential of China (Li et al., 2012).These uranium deposits have different sizes and different …

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Geology of Uranium Deposits

This site contains information on how uranium occurs in a number of different igneous, hydrothermal and sedimentary geological environments. Uranium deposits world-wide can be …

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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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Geochemical exploration models for sedimentary uranium …

Exploration models must take into account channelling of dispersion and possible concealment of deposits by bedding in sedimentary rocks. Most uranium deposits in …

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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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Colorado's Uranium Deposits

The uneven distribution is a function of factors involving the nature of the uranium atom and the characteristics of different types of rocks. Uranium Geochemistry and the Mechanics of Uranium Deposits. The most important factor in uranium's behavior in the crust is its sensitivity to redox conditions. Redox refers to the abundance of oxygen ...

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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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Roles of dispersed organic matters in sandstone-type uranium

In sedimentary basins, uranium deposits are classed into synsedimentary, unconformity, and epigenetic types, including that sandstone-type uranium deposits are epigenetic. The development scales of sandstone-type uranium deposits are controlled by tectonic events and provenance, sand bodies, uranium sources, and reducing media. ...

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An Introduction To Uranium Deposits | Geology for Investors

Uranium unconformity deposits are generally associated with structures in sedimentary rocks that reflect the erosion surface rocks, and the later deposition of younger sedimentary rocks above. Uranium deposits occur in sedimentary basins deposited on top of very old basement metamorphic rocks. The source of uranium is either from the basin or ...

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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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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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Sedimentary Uranium

deposits are characterized by their localization within fault, breccia, or fracture zones imme­ diately beneath a regional unconformity. Deposits Sedimentary Uranium rarely extend up into the …

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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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The extreme diversity of uranium deposits | Mineralium …

Uranium deposits formed at nearly all steps of the geological cycle, from high-grade metamorphic conditions (up to 800°C, 5 to 7 kbar), plutonic, metasomatic, hydrothermal, basin diagenesis, metamorphism, volcanic to sedimentary and superficial environments (Dahlkamp 1993).They formed from Neoarchean times to Quaternary, but none is expected to …

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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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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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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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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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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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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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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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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 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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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 dykes/sills), or …

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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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Principal genetic classes of sedimentary uranium deposits …

(After Galloway and Hobday 1996) from publication: Groundwater processes and sedimentary uranium deposits | Hydrologic processes are fundamental in the emplacement of all three major categories of ...

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The roles of organic matter in the formation of uranium deposits …

Because reduced uranium species have a much smaller solubility than oxidized uranium species and because of the strong association of organic matter (a powerful reductant) with many uranium ores, reduction has long been considered to be the precipitation mechanism for many types of uranium deposits. Organic matter may also be involved in the alterations in …

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Theoretical System of Sandstone-Type Uranium Deposits in …

Many theoretical results on sandstone-type uranium mineralization in northern China obtained by the uranium research team of the Tianjin Center of Geological Survey in recent years are presented. From the source sink system of uranium-producing basins, sedimentary environment of uranium-bearing rock series, ore-forming fluid information, evolution of tectonic …

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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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