Abstract: The gold grade of a low-grade conglomerate gold ore from Qinghai is only 0.51 g/t,and the oxidation degree of the ore is high.The gold minerals in the ore are mainly electrum and the particle size is mirco-fine.According to the ore properties,4 kinds of flowsheets are explored and compared including flotation,table gravity separation,Nelson gravity separation,all-sliming leaching.The results showed that the all-sliming leaching with environmental gold leaching agent is suitable for the ore treatment;flotation,table gravity separation,Nelson gravity separation all have low gold recovery rate,the highest of which is 10.72 %.Under the optimal experimental conditions,the gold leaching rate can be as good as 80.94 % by all-sliming leaching with environmental gold leaching agent.