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Vertical or near vertical opening, , Automation has completely changed underground mining in past several decades , usually in coal - may refer to a small shaft.
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Cage — In a mine shaft, the device, similar to an elevator car, that is used for hoisting personnel and materials Calorific value — The quantity of heat that can be liberated from one pound of coal or oil measured in BTU's Cannel coal — A massive, non-caking block coal with a fine, even grain and a conchoidal fracture which has a high percentage of.
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