Bacterial oxidation of an arsenical gold sulphide concentrate from Olympias, GreeceBacterial oxidation of an arsenical gold sulphide concentrate from Olympias, Greece Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-11-011990enThe application of bacterial oxidation as a pretreatment step for the extraction of gold from arsenical gold sulphide concentrates offers potentially significant economic advantages over oxidative pretreatment alternatives. In this study the bacterial oxidation of an extremely refractory gold sulphide concentrate, from Olympias, Greece, is examined. Leaching tests were conducted in air-stirred pachuca reactors in order to determine the effect of pulp density on the degree of pyrite and arsenopyrite oxidation. Cyanidation tests were conducted in order to determine the degree of gold and silver liberation in relation to the degree of each sulphide phase oxidised and to the cyanide consumed. Mathematical analysis of the leaching data allowed the gold distribution in each sulphide mineral phase to be estimated and the gold recoveries according to the degree of each mineral oxidised predicted.Δημοσίευση σε επιστημονικό περιοδικόhttp://creativecommons.org/licenses/by/4.0/Minerals Engineering3-43 295–306 Komnitsas Konstantinos Κομνιτσας Κωνσταντινος Pooley F.D. Elsevier Arsenical gold concentrate bacterial leaching pachuca reactor leaching cyanide leaching gold and silver recovery