Abstract: A lowgrade and highoxidation rate of mixed sulphideoxide copper ore in Yunan Province contains Cu content of 0.33%,copper sulphide of 49.09% and copper oxide of 50.91%.In order to determine the development and utilization technology of the ore,the mineral processing testing studies were carried out.The results presented that in the case where the grinding fineness is -0.074 mm accounting for 86.40%,the copper concentrate with copper content of 18.58%,recovery rate of 77.55% and gold content of 4.23 g/t can be obtained by using a copper sulfide flotation process and a copper oxide flotation process with both one stage of roughingthree stages of cleaningone stage of scavenging procedures.The indexes of test results performed well,and the study realized an efficient comprehensive recovery of copper and gold in lowgrade mixed sulphideoxide copper ore,which could provide the technological design basis for the mine development and ore utilization.

Key words: Lowgrade and mixed sulphideoxide copper ore,Copper oxide minerals,Copper sulfide minerals,Preferential flotation