METHOD OF FORMATION OF CUTTING HOLLOW AT SINKING OF MINING WORKINGS Russian patent published in 1996 - IPC

FIELD: mining art, can be used in underground construction and at mining of mineral resources. SUBSTANCE: the method consists in drilling of the main and shortened pressing holes, their charging, successive blasting of charges of cutting holes, beginning from the pressing ones. The novelty in the method is in the fact that each pressing hole is arranged in pair with the respective main hole, inclined to the plane of the working face. The main holes are charge deeper of the places of maximum approach of the pressing and main holes. EFFECT: enhanced technical-and-economic indices of working sinking. 3 dwg