METHOD FOR COAL EXCAVATION FROM THICK STEEPLY BEDS Russian patent published in 2005 - IPC

FIELD: mining, particularly for thick steeply bed development by drilling and blasting breaking thereof.

SUBSTANCE: method involves preparing excavation field by cutting levels by means of forming gangways and air drifts which limit height of each level; forming sublevel drifts to divide levels into sublayers; separating sublayers into blocks along the strike by cutting out coal chute and ventilation raises; mounting conveyer for coal transportation and composite feeders for coal discharge on ground of sublevel drift on bottom of each block; digging-out compensative drifts above sublevel ones; developing blocks by drilling thereof from compensative drifts and blasting coal in block with pillar establishing; drilling around the pillar from sublevel drift and blasting coal in the pillar so that all broken coal lays on composite feeders; moving coal from block to conveyer by composite feeders; unloading coal from composite feeders on the conveyer over the full block bottom area by tightly mounting composite feeders one after another over the full sublevel drift length within the limits of the block. Coal discharge and transportation may be performed under remote control.

EFFECT: prevention of coal rubbling during discharge; reduced coal impoverishment and losses, increased fire safety.

3 cl, 4 dwg