DEVELOPMENT METHOD OF THICK STEEP COAL BEDS Russian patent published in 2013 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: between sub-levels and compensating gates dividing sub-levels into mining blocks there are furnaces with slope parallel to angle of formation of caved ground in mined area relatively to the line of bed course. Ventilation roadway for ventilating the below sub-level is made after mining and forced falling of the roof at above sub-level, note that above the ventilation roadway there maintained is a protective pillar that temporary prevents rock falling. In below sub-level the roof is controlled by stepped bypassing of caved ground from the above sub-level to bottom-hole area of below sub-level, exposed for allowable passage, note that allowable passage of roof exposure in bottom-hole area of below sub-level and corresponding extended distance between the blocks in comparison to the above sub-level is defined by the expression.

EFFECT: invention allows increasing coal production efficiency.

3 cl, 9 dwg