Abstract: A copper ore in Yunnan Province contains 0.35% Cu，0.114 g/t Au，the recovery of copper and gold is 91.60% and 45.70% respectively through the on-site process，at the grinding fineness of 74.30% -0.075 mm using sodium butyl xanthate as copper collector.To improve the recovery of associated gold，copper flotation experiments were conducted based on the on-site process with gold recovery improving as goals.The results showed that copper concentrate with 22.48% Cu，4.53 g/t Au，Cu and Au recovery of 92.85% and 56.30% respectively was obtained through the closed-circuit flotation process of one roughing-three cleaning-two scavenging at grinding fineness of 80% -0.075 mm，and with ammonium dibutyl dithiophosphate and Z-200 as combined collector and 730A as frother.Therefore，Z-200 and ammonium dibutyl dithiophosphate as combined collector not only improves the index gold recovery in copper concentrate by 10.60 percentage points，but also increase copper recovery by 1.25 percentage points.

Key words: Flotation, Copper ore, Associated gold, Combined collector Z-200 and ammonium dibutyl dithiophosphate