PREPARATION METHOD OF STOPE BOTTOMS Russian patent published in 2013 - IPC E21C41/22 

FIELD: mining.

SUBSTANCE: method involves driving of delivery cross drifts and a trench cross drift on the level of roof of loading mounts. The trench cross drift is driven in the form of a zigzag, with a deviation from an axial line of a stope by a value equal to supposed wear of a hood, which can be up to 2 m. Loading mounts are driven from delivery cross drifts at an angle of 60-90° and cut through in a staggered order with the trench cross drift in places of its maximum deviation from the stope axis. A dead end of delivery mounts - exhaust recesses is driven till an outlet trench appears under the trench cross drift by simultaneous blasting of blast-hole charges. The ore that was cut through under the trench cross drift is shrunk and used as a working platform for the purpose of drilling, charging and blasting of wells at development of an outlet trench. Then, ore pillar and hood above loading mounts are reinforced out of the trench cross drift. After that, the outlet trench is developed by charging and blasting of fans of wells out of the trench cross drift.

EFFECT: improving safety of works, working efficiency at ore discharge and delivery, indices of ore extraction from a stope owing to preserving working length of loading mounts, rational order of performance of loading mounts at the bottom and reinforcement of its most important elements.

2 cl, 5 dwg