IMPACT OF AVAILABILITY AND UTILISATION OF DRILL RIGS ON .Iron ore occurs on five hills at KML. Five drill rigs which are currently in operation at KML were studied in this work. The causes of the rig breakdowns observed.size of rigs for iron ore drilling,Drilling methodsTunneling and UG mining drilling equipment . Small rig applications, 22-45 mm hole sizes. .. 3 – 6 m long iron tubes – filled with wires – are burnt by a.size of rigs for iron ore drilling,Whole-body Vibration Exposure of Drill Operators in Iron Ore Mines .Vibration sources in opencast iron ore mines include machines such as drills, .. Both the machines are multi-pass rotary drilling rig specifically designed for . The drill bit size is 127–171 mm and it can drill up to a depth of 27.4 m with a 9.1-m.
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