STRIP ROOM METHOD OF EXPLOITATION OF POTASSIUM GENTLE-SLOPE BEDS WITH STOWING Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: method involves driving of development workings; excavating minerals by rooms in two stages; forming pillars between first-stage excavation rooms; providing support of overlying rock formation by pillars; stowing of first stage excavation rooms by hardening mixtures; partial working of formed pillars of mineral by second stage excavation rooms and forming of supporting strip pillars; upon excavation of first-stage rooms and stowing of these rooms, forming enhanced mineral excavation zone by second-stage excavation rooms, with supporting strip pillars being performed simultaneously with one-side stowing by forming pillars along stowed first-stage excavation rooms; discharging supporting strip pillars by forming discharge pillars in the vicinity of enhanced ore excavation zone borders between stowed first-stage excavation rooms through excavation of minerals by second-stage rooms. Length of second-stage excavation rooms is less than length of first-stage excavation rooms by a value equal to discharge pillar length. EFFECT: increased-efficiency exploitation of beds. 1 dwg