Issue |
E3S Web Conf.
Volume 627, 2025
VI International Conference on Geotechnology, Mining and Rational Use of Natural Resources (GEOTECH-2025)
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Article Number | 01011 | |
Number of page(s) | 10 | |
Section | Geology, Geophysics and Geotechnology | |
DOI | https://doi.org/10.1051/e3sconf/202562701011 | |
Published online | 16 May 2025 |
Presence and impact of silica and organics in uranium in-situ leaching solutions
1 Navoi Mining and Metallurgical Company JSC, 210100, Navoi, Uzbekistan
2 Navoi state university of mining and technologies, 210100, Navoi, Uzbekistan
* Corresponding author: nava2121@mail.ru
All uranium deposits of Uzbekistan mined by in-situ leaching (ISL) method belong to the so-called sandstone type and are formed on the redox barrier, with the Loyliken deposit, belonging to the so-called basal type, formed on the gley barrier, and all the rest, belonging to the roll type - on the complex gley-sulfur-hydrogen barrier. In all cases, the initial reducing agent is carbonized plant detritus (CPD), which is charred plant flakes scattered in sandstone, usually not exceeding 1 mm in cross-section - with the difference that at the gley barrier it is the direct uranium reducing agent, and at the gley-sulfur barrier a significant part of uranium is reduced by hydrogen sulfide, which is a product of biochemical reduction of sulfate ions contained in formation water by the same CPD (the so-called sulfate- reduction reaction). Among other conditions necessary for the formation of conditioned uranium mineralization, it is required that the CPD content in the formation is not less than 0.05% per organic carbon (Сorg). At the same time, uranium concentration in almost all sandstone deposits of Uzbekistan is comparable to Сorg concentration.
© The Authors, published by EDP Sciences, 2025
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