gold mining terminology

gold mining terminology

A. Abutment - A coalminingterm to describe the weight of the rocks above a narrow roadway transfering to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway.; Angle of dip - The angle at which strata or mineral deposits are inclined to the horizontal plane.; Anorthosite - A plutonic rock composed almost entirely of plagioclase, which is usually

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