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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 abutment, that is, the settled packs behind the face.Stereoscopic Images Mining (Coal and Iron Ore) The ,A carload of coal is on the elevator or cage ready to be lifted to the top of the dump into the breaker. The cage and the shaft are the center of a mine of this kind. To it lead the many switches from acres of underground rooms.

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