FIELD: breakage of solid rocks in quarries. SUBSTANCE: established preliminary is boundary of two conjugated blocks to be crushed. Groups of additional holes are drilled parallel to established boundary, and explosive charges, blasting means and stumping are placed in holes. Charges are initiated with ultrashort delay. Blasting is resulted in dilatation loosening of rocks in crushed blocks. Then main blast holes are drilled at high speed in broken blocks and rocks are subjected to blast crushing. EFFECT: higher efficiency. 2 dwg
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