Cyanidation is adopted widely in gold industries. However,the cyanidation leaching for gold has a harmful influence on the environment,especially the underground water and operation workers. In some countries and regions,cyanidation has been inhibited. Since the thiosulphate system is non-toxic,safe,less adverse to the environment,and can leach faster than cyanide and extract gold from refractory ores( copper-gold ores and carbonaceous ores) which cannot be resolved by cyanidation leaching,the thiosulphate ...