Investigation on the cyanide leaching optimization for the treatment of KCGM gold flotation concentrate-phase 1

The leaching of the sulphide concentrate at a coarser grind is not an economical option. Lead nitrate addition showed a more beneficial effect on the leaching of UFG than leaching of the bulk concentrate. A plant trial on the effect of high lime concentration and lead nitrate addition, as well as a pilot plant trial, are scheduled to test the laboratory results.