HYDRAULIC BOREHOLE MINING METHOD Russian patent published in 1995 - IPC

FIELD: hydraulic mining. SUBSTANCE: method involves drilling of well, lowering of air-duct, perforated pulp-lifting pipe and central agent-supply pipe; mounting crown with air supply branch pipes, working agent supply branch pipe and pulp discharge branch pipe; opening of design well gap and positioning agent supply pipe end below pulp-lifting pipe end; supplying compressed air and working agent so that ore is discharged onto surface and room is formed; cutting-off supply of air and working agent into bed; providing abrupt discharge of air into atmosphere through pipes for supplying air and discharge of pulp; supplying working agent and air for breaking of ore and cleaning of room. During interval between cutting-off of air and working agent supply and discharge of air into atmosphere, working agent pipe is lifted, water column is forced from air-duct and pulp-lifting pipe to the level of perforations in pulp-lifting pipe by delivery of air into air duct pulp-lifting pipe. Working agent supply pipe is lowered to initial horizon upon release of air. EFFECT: increased efficiency in controlled supplying of ore to hydraulic mining tool. 1 dwg