Abstract: The grade of copper is 2.96% in a sedimentary rock type sulfur-oxygen mixed copper ore in abroad. Experimental study on ore dressing was carried out on the basis of technological mineralogy to determine the reasonable development and utilization technology of the ore. The results indicated that: ①The main copper minerals are chalcocite， cuprite， malachite and chrysocolla and the main gangue minerals are quartz， calcite and dolomite. The disseminated grain size of chalcocite and cuprite is generally from 0.02 to 0.30 mm while the disseminated grain size of malachite and chrysocolla is mainly from 0.02 to 1.20 mm. Copper sulfide accounts for 60.14% and copper oxide accounts for 39.86% of the total copper content. ②With the grinding fineness of -0.074 mm accounting for 73.60%， the copper sulfide minerals were floated preferentially using combined collector(butyl xanthate+ethyl xanthate) in the process of two roughing-two cleaning-one scavenging. Then copper oxide minerals were floated in the presence of sodium sulfide as vulcanizing agent and mixed collector(butyl xanthate+alkyl hydroxamic acid) with one roughing-three cleaning-two scavenging process. The copper sulfide concentrate with Cu grade of 46.92% and Cu recovery rate of 71.57%， and copper oxide concentrate with Cu grade 29.23% and Cu recovery rate of 16.08% were achieved. The total copper grade and recovery rate was 42.17% and 87.65%， respectively， which means better separating index.

Key words: Copper sulfide minerals, Copper oxide minerals, Flotation, Comprehensive recovery