FIELD: mining. SUBSTANCE: method includes well drilling, interconnection of the drilled wells, firing the seam, converting fuel into gas to produce generator gas and grouting the caved in rocks of the worked out strata by supplying backfill material along the wells. Wells for supplying backfill material are drilled with branched or single horizontal portion placed directly in rock roof above its horizontal axis. Backfill material is supplied using compressed air to fill the worked out space in caving in rock roof spaced from the fire face. EFFECT: higher efficiency. 11 cl, 2 dwg
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