Abstract:Thiosulfate leaching test was conducted on a refractory copper-gold concentrate from Northeast China. Effects of ore pretreatment conditions, leaching time, L/S, thiosulfate dosage, and dosage of ammonia water on leaching rate of gold, silver and copper were investigated. The results show that content of Au, Ag, and Cu in leaching residue is 3.04 g/t, 63.2 g/t and 12.16% respectively, and leaching rate of Au, Ag, and Cu is 92.43%, 9.23%, and 6.68%, respectively under the conditions including grinding fineness of -38 μm of 97%, slurry density of 25%, dosage of thiosulfate of 1.08 t/t, dosage of ammonia water of 0.35 t/t, and leaching in shake flask at normal temperature for 24 h. Zinc powder replacement and carbon adsorption are not suitable for recover precious metals from thiosulfate gold extraction solution.