SUBSURFACE WORKING OF CHITTERS AT HIGH GAS CONTENT OF COAL AND HOST ROCK Russian patent published in 2014 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: method comprises advance extraction of underlying protective coal beds. Beds are divided into gateways to be prepared by dual development drifts with coal pillars left there between. Gateway is extracted by longwall with top rocks fall in worked-out area. It includes recovery of one preparatory gateway behind the longwall and supporting of second preparatory gateway behind the longwall for its reuse at extraction of adjacent gateway. At extraction of adjacent beds at mine field sections complicated by disjunctive geological disturbances orientation of said disturbances in space is defined. Dual development drifts extend in foot wall of said disturbance parallel with intersection of protective bed with the surface of disturbance shifter. Boundary of gateway and preparatory drift recovered behind the longwall is located in the line of intersection between protective bad and shifter of disjunctive geological disturbance.

EFFECT: higher efficiency of protected layer degassing, lower costs, higher efficiency of second working.

2 dwg