FIELD: mining industry. SUBSTANCE: method comprises consecutive multistep crushing and grinding. The last before grinding crushing step is conducted in high-speed centrifugal impact crusher at the speed of impact of ore lumps against shield within the range 70-150 m/sec until lump size 10/12/-0 mm is achieved. Then crushed ore is ground in conventional ball mill until lump size sufficient for flotation is obtained. EFFECT: optimized operation parameters. 2 tbl
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