PILLARS DEMOLITION METHOD Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: method provide creation of charging and weakening cavities in pillar mass, placement of concentrated charges of explosives in charging cavities and breaking rock mass onto compensating space and pressing medium. Centers of charging cavities are located on one line in working. In the case weakening cavities are formed by one charge, placed in mating cavities with opposite cumulative forms and charging cavities are located between project contours of the mass, hit by concentrated charges of explosives, and they are exploded with short delay. One of weakening cavities is formed by charge of increased mass, that is exploded with first step of delay. Concentrated charges are blown up in last turn. EFFECT: method is effective in ore deposits development. 2 dwg