FIELD: mining art. SUBSTANCE: method includes driving the drifts parallel to strike of rocks of lower wall behind the rock displacement zone. Upward producing boreholes are drilled at an angle more than 5 deg to horizontal plane, across the strike through the entire thickness of coal formation from the extreme coal seam to drifts. EFFECT: higher efficiency. 2 dwg
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Authors
Dates
1997-11-27—Published
1995-08-01—Filed