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|The influence of pulp density, ferric ion concentration and particle size on the tank bioleaching of two kinds of refractory gold concentrates are discussed. The chemistry and mechanism of the bioleaching process are also presented. The relationship between oxidation of sulphides, liberation of enclosed gold and gold cyanidation are discussed. The consumption of NaCN could be reduced by alkaline treatment of bioleached residues prior to Cyanidation.|