METHOD FOR MINING OPERATIONS IN SERIES OF HIGHLY GASEOUS COAL SEAMS Russian patent published in 2013 - IPC E21C41/18 E21F1/00 

FIELD: mining.

SUBSTANCE: method includes simultaneous coal extraction at upper and lower seams with advancing the broken working at upper seam and coal transportation to skip shaft from all longwall faces of worked-out seams of series. Penetration of vertical transportation blind pits from grouped field haul roadway to conveyor cross-cuts of all longwall faces is done at series travelling side. At series ventilation side there are vertical ventilation blind pits from grouped field ventilation roadway to ventilation cross-cuts of all longwall faces creating pyramid-shaped network of mines connected between themselves from lower to upper seam. The descending air stream from all series longwall faces is directed to ventilation bore through grouped field ventilation roadway made in the roof of upper seam. With the help of bulkheads with holes mounted in pyramid-shape network of mines there provided is a diagonal movement of air streams in the pyramid with exhaust of methane-air mixture from outgoing longwall faces and mines areas and formation of general mine ventilation air stream for extracting methane to the mine surface.

EFFECT: invention allows improving the efficiency of methane-air mixture exhaust from mine.

5 dwg