FIELD: concentration of minerals. SUBSTANCE: method involves ore grinding, pulping, pulp conditioning with depressing agent, addition of collector, foam-forming agent and flotation of sulfide minerals. Depressing agent is polymeric compound of the formula given in invention description. Additionally, an agent modifying the surface is used: NaSH, NaCN, Noux reagent, mercaptoethanol, thioglycolic acid, sodium and potassium ferrocyanide, hydroxyethyltrithiocarbonates, ozone, air oxygen, sulfur dioxide, zinc cyanide, arsenicum Noux reagent, mercaptopropionic acid, mercaptosuccinic acid, 2-thiouracil and thioglycerol. EFFECT: improved method of ore concentration. 5 cl, 1 tbl
