Uranium ore - Wikipedia
There are several themes of uranium ore deposit formation, which are caused by geological and chemical features of rocks and the element uranium. The basic themes of uranium ore genesis are host mineralogy, reduction-oxidation potential, and porosity. Uranium is a highly soluble and radioactive heavy metal.
Mineral deposit - Roll-Front, Uranium, Ore | Britannica
Mineral deposit - Roll-Front, Uranium, Ore: Uranium occurs in two valence states, U4+ and U6+. Weathering of rocks converts uranium into the +6 state, in which state it forms the uranyl ion (UO2)2+. Uranyl compounds tend to be soluble in groundwater, whereas U4+ compounds are not.
2009年2月19日 · Roll-fronts are the predominant uranium deposit in the RMIBUP and the CPUP, and the only type found in the GCUP. The uranium is typically deposited as uranium oxides and, to a lesser extent, uranium silicates. Uranium concentrations range from 0.04 to 0.25 percent; the deposits generally range in size from 0.5 to 20 million pounds.
Despite generally low uranium grades, roll-front uranium deposits are attractive exploration targets as these deposits are amenable to in-situ leaching (ISL) techniques. At the Lost Creek Project, a currently operating uranium mine in Wyoming, head grades were five times higher than pre-operational estimates.
Origin and Role of Kaolinization in Roll‐Front Uranium Deposits …
2018年4月18日 · Kaolinite is a common mineral found in most Chinese sandstone-hosted uranium deposits. It occurs particularly in coal-bearing clastic rocks in northwest China, such as the uranium deposits in the Yili Basin, which is well known for hosting several large-scale roll-front uranium deposits.
Evidence of uranium biomineralization in sandstone-hosted roll-front ...
2005年7月1日 · We show evidence that the primary uranium minerals, uraninite and coffinite, from high-grade ore samples (U 3 O 8 >0.3%) in the Wuyiyi, Wuyier, and Wuyisan sandstone-hosted roll-front uranium deposits, Xinjiang, northwestern China were biogenically precipitated and psuedomorphically replace fungi and bacteria. Uranium (VI), which was the sole ...
Mineral paragenesis and textures associated with sandstone-hosted roll ...
2005年3月1日 · We present a first paragenetic study of the Wuyier, Wuyisan, Wuyiyi and Shihongtan sandstone-hosted roll-front uranium deposits, northwest China. The mineralization is hosted by Lower–Middle Jurassic coarse- to medium-grained sandstones, which are dark-gray to black due to a mixture of ore minerals and carbonaceous debris.
Selenium and molybdenum enrichment in uranium roll-front deposits …
2017年9月1日 · Sandstone uranium (U) roll-front deposits of Wyoming and Colorado (USA) are important U resources, and may provide a terrestrial source for critical accessory elements, such as selenium (Se), molybdenum (Mo), and tellurium (Te).
The uranium in these deposits, which are called roll fronts, has long been thought to form over millions of years via chemical reactions of sulfur and other non-biological compounds to form crystalline uraninite.
Geology of Uranium Deposits - World Nuclear Association
2024年5月16日 · Roll-front deposits – arcuate bodies of mineralisation that crosscut sandstone bedding, often in palaeochannels. Examples are Budenovskoye, Tortkuduk, Moynkum, Inkai and Mynkuduk (Kazakhstan) and Crow Butte and Smith Ranch (USA). Tectonic/lithologic deposits – occur in sandstones adjacent to a permeable fault zone.