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Room and pillar is a method employed in underground mining in which rooms are cut into the coal bed and pillars of ore are left to provide support.

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Room and pillar - Wikipedia, the free encyclopedia. The key to successful room and pillar mining is in the selection of the optimum pillar size.

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Coal mining - Wikipedia, the free encyclopedia. The goal of coal mining is to obtain coal from the ground. Coal is valued for its energy content, and, since the 1880s ...

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