Patent ID: 9732398
Date: 2017-08-15
CPC Classifications: C22B,Y02P

Claim:
1. A process for the extraction of gold from a gold-bearing ore or concentrate, consisting the steps of: a) leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV; b) subjecting the solution obtained in step a) to a liquid/solids separation step; c) subjecting the liquid obtained in step b) to an organic solvent extraction step to selectively extract gold from the liquid and obtain a pregnant gold-bearing organic solvent extractant solution; d) stripping gold from the pregnant organic solvent extractant solution obtained in step c) with sodium thiosulphate; and e) recovering gold; in which the organic solvent extraction of step c) is carried out using an oxime.