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Coal mining is only a temporary ... Roomandpillar mining. In roomandpillar mining, coal deposits are mined by cutting a network of ''rooms'' into the coal seam ...
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mining: roomandpillar and longwall mining. In roomandpillar mining, coal deposits are mined by cutting a network of ''rooms'' into the
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Coal Mining Methods Underground Mining Longwall Room and Pillar Mining Longwall mining and roomandpillar mining are the two basic methods of mining coal
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