Abstract: A low-grade gold ore in Gansu was oxidized seriously,the gold minerals of which were mainly disseminated among the limonite particles and in the cracks and holes filled with clay minerals,in the form of micro-particles and submicro-particles.Therefore,it belongs to a refractory ore.Aimed at the ore properties,the two kinds of technological flowsheets of all-slime cyanidation leaching of gold and flotation concentration-cyanidation leaching of gold were carried out.The results show that when the technologica...