October 2013

CIM Journal

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 Excerpts taken from abstracts in CIM Journal, Vol. 4, No. 3. To subscribe, to submit a paper or to be a peer reviewer—www.cim.org

Evolution of gold gravity recovery in grinding circuits – a critical review

S. Koppalkar, MET-CHEM, Montreal, Quebec, Canada; A. Bouajila, G Mining Services Inc., Brossard, Quebec, Canada; and C. Gagnon and S. Makni, COREM, Quebec, Quebec, Canada

ABSTRACT This paper briefly reviews the gravity recovery between conventional and centrifugal gravity separators. The advantages of semicontinuous gravity separators is discussed, as will techniques for upgrading the gravity concentrates. The research efforts in optimizing semicontinuous gravity separators will be recalled. An innovative gravity circuit for eliminating or minimizing the use of complex processing schemes will be reviewed. Efforts to devise possible remedies for improving plant gravity recovery will be discussed.

Pilot plant pressure oxidation of a refractory gold-silver concentrate

M. J. Collins, D. Yuan, I. M. Masters, and R. Kalanchey, Sherritt Technologies, Sherritt International Corporation, Fort Saskatchewan, Alberta, Canada; and L. Yan, Sherritt International Corporation, Beijing Representative Office, Beijing, P. R. China

ABSTRACT 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, 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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