FIELD: stratum deposits development. SUBSTANCE: coal pillars are made trapeziform or triangular, parameters of which are defined by position of exhausted face and meeting angle of face with direction of cracks of roof rocks and coal pillar. Coal pillar till long-wall face approach is preliminary contoured by additional mine working, that is fixed by temporal yielding supports. EFFECT: improved safety of stratum drifts. 3 cl, 5 dwg
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