SOLID MINERALS DEPOSITS EXPLOITATION METHOD Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: auxiliary boreholes are drilled at boundary of extracting chamber, spaced from each other by less than diameter of intensive cracking zone, formed by explosion of located there explosive charges. Explosion of explosive charges in auxiliary boreholes are exercised, forming simultaneously ring-type zone of cracking. In main borehole explosion of explosive charges is exercised close-delaying with crushing of minerals and forming bottom of chamber with angle of taper, that exceeds angle of natural slope of crashed mineral. Number of auxiliary boreholes is determined by mathematical expression. Feeding of working fluid they make pulp, extracted up to the ground. Besides, heavy suspensions are used in exploitation of minerals with big specific gravity. EFFECT: method is used for borehole hydraulic extraction of solid minerals. 2 cl, 5 dwg