FIELD: concentration of mineral resources. SUBSTANCE: bulk flotation is conducted in alkaline medium produced by lime with introduction of copper-molybdenum concentrate. The latter is treated by oxygen at a temperature of 60 to 95 C. Selective flotation of copper-molybdenum concentrate is conducted with separation of molybdenum to a froth product. Acidifying thermal treatment is accomplished at a pressure of 0.05 to 1.0 MPa, beginning at pH-value within 11.0 to 8.5 and completing at pH-value within 8.0 to 6.0. Selective flotation is conducted at pH-value within 6.0 to 8.0. EFFECT: facilitated procedure. 1 tbl
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