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chinese longwall coal mines

Oct 24 2013 Through partnership among coal producers equipment manufacturers and research institutions China developed the ultrathick seam longwall mining system by stages prior to 2005 development and application concentrated on 43 to 55m 14118 ft thick seams in 2007 the system applied to 63m 207ft thick seams was introduced and in 2009 the 7m 23ft thick system went

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