METHOD FOR SELECTIVE HOLLOW COAL BED CUTTING Russian patent published in 2007 - IPC E21C41/18 

FIELD: mining, particularly underground bed mining.

SUBSTANCE: method involves separately excavating coal and interlayer rock by means of cutter-loader; separating cut coal and interlayer rock flows in breakage face; transporting cut coal to day surface and conveying interlayer rock. First of all coal string is excavated from layer located over interlayer and cut coal is loaded on face conveyer to transport thereof to belt heading and then to ground surface along transport path. Then coal strip is excavated in bed layer located under interlayer and cut coal is conveyed by lower layer face conveyer to belt heading along with well drilling, interlayer rock supporting in interwell pillars, interwell pillar breakage under pillar gravity, interlayer rock loading in the same vehicle and cut interlayer rock transporting to air heading and to ground surface by means of supplementary vehicles. Residual drill cuttings left in interlayer rock are also directed with interlayer rock flow.

EFFECT: increased efficiency.

3 dwg