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Several new names appear in the annual US Longwall Census but the population remains the same 52 although the number of longwall mines dropped from 40 to 47 CONSOL Energy remains the leader with 12 faces Robert E Murray owns 8 longwall mines followed by Arch Coal with 5 and Foundation Coal with

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There are six principal methods of underground mining Longwall mining accounts for about 50 percent of underground coal dust control at crusher maining

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