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How is coal mined?
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Most coal is mined by either the 'longwall' or 'room-and-pillar' method. In longwall mining a giant coal cutter runs down the coal face removing coal as it goes. In room-and-pillar mining the coal is removed from chambers, but pillars of coal are left behind to support the roof.
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Previous:
Back
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Book:
Best Ever Q&A
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Section:
Science & Technology
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Chapter:
Industry
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