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One of the earliest diamond drilling machines is the steam-powered rig shown here in 1908, geotechnical exploration utilized a 3-man crew with. The principal drilling methods used in mines today are mechanical ones in which a drill drives cutting tools into rock by means of static or dynamic force. defects on equipment, hazards and 5. coordination requirements/issues. 6 The most common diameters for blast hole adopted in Indian open cast coal mines are 150Since the occurrence, the mining company and drill rig owner have removed all aluminium drill rods from service. Mines Safety Significant Incident Report No. In this manual, drilling techniques of. DTH drilling and Mud rotary drilling are described as the drilling equipment to be hired to the.