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Mining Engineering Coal Mining Difficulty: Medium

Scaffold not required in . . . . . . . . tubbing

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The diameter of the groove of the head gear pulley should be . . . . . . . . of the rope diameter for stranded ropes. Number of tracks and ropes, drums required for direct rope haulage . . . . . . . . The line drawn through the points of same declination is known as . . . . . . . . The closing error in traverse conducted by compass survey is adjusted graphically by . . . . . . . . rule. Controlling the course of bore hole to follow predetermined path and complete the hole at desired surface location called