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Talc is belong to

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Number of holes drilled by two persons is sandstone with a depth of 1.2 - 1.5 m. The axial flow fan is fitted with guide blades at the . . . . . . . . side. The maximum height of roadway permitted by law. While driving slices, what should be the minimum thickness of rib of coal to be left against adjacent goaf. Major defficiencies with auger mining are