KY-310A Blast hole drill rig 1,Suitable for large size open pit mine 2,iron ... ,copper,gold,coal,hydraulic power plant,etc. KY-310A Drilling Rig (tircone bit)ParameterSpecificationsBorehole dia (mm)310Hole depth (m)18Hole direction ... Stone,Gyratory,Calcite,Clay, Dolomite KY-310A Blast hole drill rig