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Longwall mining is a form of underground coal mining where a long wall of coal is mined in a The only other machinery used was an electric cutter to undercut the coal The tailgate road is formed behind the coal face by removing the stone At the main gate the coal is usually reduced in size in a crusher,...
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A Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back ....
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At the tipple, the coal is dumped into a hopper that feeds the primary crusher, then is conveyed through additional coal preparation equipment such as secondary crushers and screens to the storage area If the mine has open storage piles, the crushed coal passes through a coal ,...
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Some roll crushers, notably the light coal crushing type, have more of a tearing action, as contrasted to the heavy sledging performance of such machines as the Fairmount crusher Here are several, but not all, types of crushers:...
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