METHOD FOR CHAMBER MINING WHEN PREPARING HORIZONS Russian patent published in 2017 - IPC E21C41/16 E21F1/00 

FIELD: mining.

SUBSTANCE: method of chamber mining when preparing horizons includes division of mine field into excavation areas, development of bed access drifts, extraction of mineral resources with stope chambers in advance or retreat order, delivery of ore with self-propelled equipment, transportation of ore using a conveyor, ventilation of stope chambers using local ventilation fan. Development of horizons is performed in turns, at first the upper horizon and then the lower one. Fresh air is fed through access drifts of the lower horizon, and the outgoing airstream is removed through access drifts of the upper horizon. The sill of the conveyor drift at the lower horizon is deepened relatively to the sill of the mining drifts. The upper horizon includes one transportation drift, and on the lower one includes the conveyor, from which entering the stope chambers is performed.

EFFECT: invention allows to increase effectiveness of stope mining operations and reduce labor costs when extracting mineral resourses by eliminating development of ventilation holes and inter-chamber connections as well as to increase ventilation efficiency of the working area by arranging ventilation and removal of outgoing air stream from access drifts separately from the operation areas.

3 cl, 5 dwg