METHOD FOR EXPLOSIVE BREAKING IN PIT-FACES OF UNDERGROUND PURIFYING ENCLOSURES

FIELD: mining industry. SUBSTANCE: method includes crushing of rock by means of explosive charges with uniform placement of horizontal cables rows and of cables in rows. Crushing of inner pit-face section is performed by consecutive diagonal exploding of horizontal cables groups, placed in rows in staggered order symmetrically to pit-face center with forming of shelves and additional exposed surfaces. In the pit-face center trapezoid jads are formed by exploding horizontal cables in two adjacent rows with forming of exposed surfaces. Crushing of contour-adjacent pit-face areas is performed by means of cables explosions in series according to rows order. Between each couple of contour-adjacent area cables at least one non-charged cable may be placed. EFFECT: uniform granulometric composition of broken rock, increased effectiveness of explosive charges energy use. 2 cl, 2 dwg, 1 tbl