Abstract:A stage grinding-Cu-Mo bulk flotation process was preferred to the comprehensive utilization for a Mongolia low-grade copper-molybdenum associated sulphide ore, which based on mineralogical property analysis, optimization test of roughing and cleaning conditions, and process comparison of mixed flotation. The results show that, part of the target minerals present in micro fine grains or complex mineral aggregate, and some of gangue minerals are easy to be grinded and muddied. The quality of Cu-Mo mixed concentrate leads to the qualified molybdenum concentrate which produced by Cu-Mo separation. With the usage of stage grinding for the effective dissociation of target minerals and the modification of reagent system for the Cu-Mo iso-floatability flotation, it obtained a Cu-Mo mixed concentrate which Cu grade is higher than 25%, Mo grade is higher than 1%, and Cu as well as Mn recovery is greater than 88% under the laboratory conditions. The stage grinding-mixed flotation shows and provides an efficiently comprehensive recovery method for the low-grade associated Cu-Mo sulphide ore resources.