scholarly journals In-situ Isotopic and Chemical Study of Pyrite from Chu-Sarysu (Kazakhstan) Roll-front Uranium Deposit

2015 ◽  
Vol 13 ◽  
pp. 207-210 ◽  
Author(s):  
Philippe Lach ◽  
Michel Cathelineau ◽  
Marc Brouand ◽  
Nicolas Fiet
Keyword(s):  
Uranium Deposit ◽  
Chemical Study

Assessment of amenability of sandstone-hosted uranium deposit for in-situ recovery

2018 ◽  
Vol 179 ◽  
pp. 157-166 ◽  
Author(s):  
Laura L. Kuhar ◽  
Karl Bunney ◽  
Michael Jackson ◽  
Peter Austin ◽  
Jian Li ◽  
...  
Keyword(s):  
Uranium Deposit ◽  
In Situ Recovery

In-situ mineral chemistry and chronology analyses of the pitchblende in the Shazijiang uranium deposit and their implications for mineralization

2019 ◽  
Vol 35 (9) ◽  
pp. 2679-2694 ◽  
Author(s):  
CHEN YouWei ◽  
◽  
HU RuiZhong ◽  
LUO JinCheng ◽  
DONG ShaoHua
Keyword(s):  
Uranium Deposit ◽  
Mineral Chemistry

The Redox Environment of Deep Groundwaters Associated with the Tono Uranium Deposit, Japan

2002 ◽  
Vol 713 ◽  
Author(s):  
Randy Arthur ◽  
Teruki Iwatsuki ◽  
Katsuhiro Hama ◽  
Kenji Amano ◽  
Richard Metcalfe ◽  
...  
Keyword(s):  
Uranium Deposit ◽  
Sedimentary Rocks ◽  
Redox Potentials ◽  
Central Japan ◽  
Flow Models ◽  
The Past ◽  
Oxidation Reduction ◽  
Reversible Redox ◽  
Approximate Location

ABSTRACTAn unconformity underlying the Tono uranium deposit in central Japan represents the approximate location of a redox front separating relatively oxidizing groundwaters (Eh ≈0 mV) in the weathered, fractured Toki granite (TG) from strongly reducing pore fluids (Eh ≈-360 mV) in sedimentary rocks of the overlying Lower Toki Lignite-bearing Formation (TL). Uranium has been effectively immobilized in the TL during the past 10 million years. Stable and reversible redox potentials measured in-situ in boreholes penetrating the sedimentary rocks and granite appear to be controlled by the Fe(III)-oxyhydroxide – Fe2+ redox couple. A simplified analytical model of front migration suggests that chemical buffering by pyrite alone would limit the propagation velocity of the front into the TL to less than 8x10−6 m yr−1. The model is constrained by Darcy fluxes derived from groundwater flow models and relative 14C groundwater ages, average modal abundances of pyrite in the TL, and the analytical detection limit for dissolved oxygen in TG groundwaters (2 ppm). Model results also suggest that the redox buffering capacity of the TL would be exhausted within 10 million years if an upper bound O2(aq) concentration in TG groundwaters fixed by equilibrium with atmospheric O2(g) (8.5 ppm) is assumed. Immobilization of uranium in the TL is thus attributable to oxidation-reduction reactions that minimize O2(aq) concentrations primarily in the TG, and secondarily in the TL.

In-situ SIMS uraninite U–Pb dating and genesis of the Xianshi granite-hosted uranium deposit, South China

2015 ◽  
Vol 65 ◽  
pp. 968-978 ◽  
Author(s):  
Jin-Cheng Luo ◽  
Rui-Zhong Hu ◽  
Mostafa Fayek ◽  
Chu-Si Li ◽  
Xian-Wu Bi ◽  
...  
Keyword(s):  
South China ◽  
Uranium Deposit

Iron Oxidized Acidophiles Distribution and Activities in an Uranium In Situ Bioleaching Site

2015 ◽  
Vol 1130 ◽  
pp. 287-290
Author(s):  
Ya Jie Liu ◽  
Jiang Li ◽  
Yi Peng Zhou ◽  
Ling Ling Xu ◽  
Wei Yun Xu ◽  
...  
Keyword(s):  
Uranium Deposit ◽  
Ion Concentration ◽  
Ferric Ion ◽  
Middle Stage ◽  
Uranium Extraction ◽  
Indirect Mechanism ◽  
Pcr Rflp ◽  
Dominant Bacteria

Iron oxidized acidophlies are important in uranium extraction for it mainly depends on the indirect mechanism of bioleaching. Taking indirect field In-Situ bioleaching experiment in a uranium deposit as an example, several strains of acidophiles were isolated from the acid leachate. Bacteria compositions of the samples taken different stages were analyzed by 16SrDNA PCR-RFLP method. Results showed that the dominant bacteria in the leachate were Acidithiobacillus.ferrivorans,At.ferrooxidans and Leptospirrilum. ferrooxidans from the beginning to the middle stage of bioleaching process. With the process carried on, ferric ion concentration increased in the oxidation tanks, L. ferrooxidans became predominant bacteria. Again confirmed that in this in-situ bioleaching site, iron oxidized bacteria were in dominant.

scholarly journals Characterization of cores from an in-situ recovery mined uranium deposit in Wyoming: Implications for post-mining restoration

2014 ◽  
Vol 390 ◽  
pp. 32-45 ◽  
Author(s):  
G. WoldeGabriel ◽  
H. Boukhalfa ◽  
S.D. Ware ◽  
M. Cheshire ◽  
P. Reimus ◽  
...  
Keyword(s):  
Uranium Deposit ◽  
Mining Restoration ◽  
In Situ Recovery
Sign in / Sign up

Export Citation Format

Share Document