METHOD OF LEACHING COPPER AND GOLD FROM SULFIDE ORE

摘要

PROBLEM TO BE SOLVED: To provide a method of leaching copper and gold from sulfide ores, capable of improving the efficiency of separation between the copper and gold.SOLUTION: The method of leaching the copper and gold from the sulfide ores includes: a step 1 of bringing a first aqueous acidic solution which contains chlorine ion, copper ion and iron ion, but no bromine ion, into contact with the sulfide ores under supply of an oxidizing agent, so as to leach copper component contained in the sulfide ores; a step 2 of separating, by solid-liquid separation, a leaching reaction liquid obtained in the step 1, into a leaching residue and a leachate; and a step 3 of bringing a second aqueous acidic solution which contains chlorine ion, bromine ion, copper ion and iron ion, into contact with the leaching residue obtained in the step 2 under supply of an oxidizing agent, so as to leach gold contained in the leaching residue.