METHOD OF INCREASING THE RECOVERABILITY OF GOLD FROM GOLD-BEARING ORES

摘要

ABSTRACT OF THE INVENTIONThe recoverability by cyanidation of the gold contentof sedimentary gold-bearing ores containing organic carbonaceousmaterial and gold-bearing pyrite, or other gold-bearing sul-fides, is greatly increased by heating an aqueous slurry of theore to about 167° to 212°F. and then introducing air or oxygeninto the heated slurry to oxidize and eliminate a substantialportion of the carbonaceous material and oxidizable sulfides inthe slurried ore, followed by cooling the slurry to about 70°to 85°F. and then introducing chlorine gas into the slurry tosubstantially complete the oxidation and chlorination of thecarbonaceous content of the slurried ore. The ore is then sub-jected to conventional cyanidation to recover the gold contentthereof.