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Longwall mining - SourceWatch . Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 1-2 m thick).

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Longwall mining - SourceWatch . Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 1-2 m thick).

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Longwall mining - SourceWatch. Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 1-2 m thick).

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