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Mine Method Selection Criteria .is based on: Geometry Depth, shape, thickness, dip, plunge Rock Quality Ore zone and host rock competency (structures, stress,
Back — The roof or upper part in any underground mining cavity. Backfill — Mine waste or rock used to support the roof after coal removal. Barren — Said of rock ...
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 ...
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