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- W2085442610 abstract "Uranium-gold mineralization occurring together has been reported in a Lower Proterozoic sequence of schistose quartzite and quartz-chlorite-sericite-talc schist. Samples contain 0.54–1.17% U 3 O 8 and 0.1–17 mg/kg Au. Three pairs of duplicate samples (−100 mesh) taken from the bulk ore were leached with dilute sulphuric acid and manganese dioxide over 6 h. Leachability of uranium varies from 86% to 96%. The uranium leach residues, using thiourea as leachant, and for the first time biogenically generated ferric sulphate (using T. ferrooxidans ) as oxidant, recorded up to 88% gold solubility. The leachability of gold in samples containing < 0.5 mg/kg Au is very poor (33–44%), indicating the occurrence of gold in a refractory matrix — as inclusions in sulphides. However, samples with higher content of gold (> 0.5 mg/kg) have shown a higher leachability of up to 88%, indicating the availability of free milling gold. Instead of batch addition, as in the present study, ferric sulphate can be formed in situ by microbial oxidation in the gold dissolution reactor. Alternatively, ferric sulphate can be generated in a separate bacterial ferrous iron oxidation (BACFOX) reactor and continuously supplied to the gold dissolution system for maintaining optimal oxidation potential." @default.
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- W2085442610 date "1996-11-01" @default.
- W2085442610 modified "2023-09-27" @default.
- W2085442610 title "Leachable U and Au in an Indian schistose quartzite" @default.
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- W2085442610 doi "https://doi.org/10.1016/0304-386x(96)00016-3" @default.
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