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Mechanization of West ia's coal mines took place gradually throughout the first half of the 20th century. Traditionally, coal mining involved the distinct ...

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Underground mining is used when the coal is buried several hundred feet below the surface or more. Some mines can extend to depths of more than 1,000 feet.

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Other underground coal mines are laid out in a checkerboard of rooms and pillars (Fig. 2), and the mining operation involves cyclical, step by-

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Devices related to the transportation of coal from the mine to processing facilities to rail loading and finally to the consumer: conveyors, underground and overland

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