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What Type Of Industry Is Coal Miner

Nov 28 2018nbsp018332The continuous miner deliberately leaves undisturbed pillars of rock and coal in the mining area to create natural supports for the ceiling This is known as quotroom and pillarquot mining When most of the coal seam has been extracted the pillars then are mined one by one allowing the roof to naturally cave in Longwall Miner Twenty percent to 30

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