BOREHOLE HYDRAULIC EXTRACTION METHOD Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: method provides for borehole drilling; lowering of air-passing, perforated pulp-lifting, central agent-feeding pipes; mounting of head with branch pipes to feed air, working agent and to remove pulp correspondingly; opening of projected interval of borehole and placing of agent-feeding pipe end below pulp-lifting pipe end. They feed compressed air with agent, extract ore up to the ground with simultaneous formation of chamber. Then they stop air and agent pumping in stratum, sharply discharge air in atmosphere, using pipes to feed air and remove pulp. Then they feed agent and air to crush ore and clean chamber. In time interval between processes of air and agent feeding stoppage and air discharge in atmosphere they lift agent-feeding pipe, squeeze water post from air-passing and pulp-lifting pipes till level of pulp-lifting pipe perforation by pumping air in air-passing and pulp-passing pipes and after air discharge they exercise discharge of agent-feeding pipe till initial level floor. EFFECT: method is used for minerals hydraulic extraction. 4 dwg