Pilot plant pressure oxidation of a refractory gold-silver concentrate

CIM Journal, Vol. 4, No. 3, 2013
M. J. Collins, D. Yuan, I. M. Masters, and R. Kalanchey Sherritt Technologies, Sherritt International Corporation, Fort Saskatchewan, Alberta, Canada L. Yan Sherritt International Corporation, Beijing Representative Office, Beijing, P. R. China

Pressure oxidation tests have been conducted by Sherritt for a refractory
gold-silver project in China. The feed contained 39 g/t Au and 970 g/t Ag; the
major gold-bearing minerals were pyrite and arsenopyrite. Because the feed
contained a significant amount of silver, which can be refractory to cyanide
leaching after pressure oxidation due to the formation of argentojarosite, the
test program included investigation of methods to enhance silver recovery. The
“lime boil” process proved successful and was incorporated into the flowsheet.
Gold extraction from the lime boil product solids was 95–98%; silver extraction
was up to 94%.
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