FIELD: mining. SUBSTANCE: driving of mine workings by drilling and blasting consists in drilling in face of cut, main and peripheral blastholes. All blastholes are charged with explosives and stemmed with self-hardening material in form of phosphogypsum. Stemming is formed in accordance with sequence of blasting of explosive charges. Explosive charges are initiated after setting of self- hardening material. Blasting sequence is as follows: first are blasted cut blastholes, then, main blastholes, and the last - peripheral ones. EFFECT: higher efficiency of rock breakage. 2 cl
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