METHOD OF MINING OF THICK HARD ROCKS DEPOSITS AT GREAT DEPTHS Russian patent published in 2002 - IPC

FIELD: mining; applicable in underground mining of hard ores at great depths. SUBSTANCE: method includes mining of ore body by continuous breakage faces with leaving no pillars, driving of development workings on drilling and haulage levels, formation of block bottom, driving of raises and formation decked torpedo charges spaces in height, blasting of these charges into compensation spaces, and clamped medium, and ore drawing through block bottom. Driven in block base, at height equalling block bottom height, is at least one horizontal torpedo working and wells in it for location of torpedo charges. Drilled from development working of drilling level are sets of holes to horizontal torpedo working and formed by sectional blasting of charges in them are raises with discharge of mined bulk through horizontal torpedo working. Then, decked torpedo explosive charges are formed in raise and torpedo charges are placed into well of horizontal torpedo working, and block ore is blasted by blasting all torpedo charges onto clamped medium and compensation space. Driven in block bottom are development workings and drawing workings are formed in block bottom with operation for undercutting of broken ore in block by torpedo charges and drawing of broken ore through drawing holes of block bottom. EFFECT: reduced expenditures for repairs and reconditioning of working of haulage horizon and bottom after ore caving in block. 3 cl, 7 dwg