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Possibility of taking into account changes in permeability of rock mass being undermined when planning methane drainage borehole systems designed to decrease methane emission in the gob from the rock mass being undermined has been considered. It is shown that industrial anisotropy of the undermined rock mass permeability appreciably effects methane drainage efficiency. A number of criteria is specified which should be taken into account when planning methane drainage systems. Experimental evaluation of the efficie...

On the basis of integrated geomechanical research, techniques for partial recovery of protective coal pillars have been developed that increased appreciably extraction ratio of mineral deposit. Proposed standard pillar recovery techniques are based on the use of modern augering machines. Use of such machines in combination with UkrNIMI accumulated potential and practical experience in the field of assessment of stressedly deformed and gas-dynamic states of coal-rock mass has made it possible to eliminate any damag...