Longwall mining is a highly mechaniz ed underground mining sys tem for mining coal it set of longwall mining equipment consists of a coal shear er mounted on convey or.
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Details2011-7-28the mining operation involves cyclical step by-step mining sequences the rooms are the empty areas from which coal has been mined and the pillars are blocks of coal generally 40 to 80 feet on a side left to support the mine roof.
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DetailsLongwall mining is a highly mechaniz ed underground mining sys tem for mining coal it set of longwall mining equipment consists of a coal shear er mounted on convey or.
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