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  • Coal Processing Multotec

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  • Coal | National Geographic Society

    22/12/2012· Surface Mining If coal is less than 61 meters (200 feet) underground, it can be extracted through surface mining In surface mining, workers simply remove any overlying sediment, vegetation, and rock, called overburden Economically, surface mining is a cheaper option for extracting coal than underground mining About two and a half times as much coal can be extracted per worker, per hour

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