FIELD: flotation of ores. SUBSTANCE: product: derivatives of 2-mercaptobenzoxazole of the formula: 
where one of R and R1 means alkyl group with 1-9 carbon atoms and other - hydrogen; R2 and R3 means hydrogen; M means H, Na, K, Li, Cr or NH4 and used for selective flotation of sulfide ore, for separation of mineral salts containing copper, zinc and silver, and separation of preliminary activated zinc sulfide minerals from other sulfides. EFFECT: improved method of flotation. 9 cl, 10 tbl
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