DM30 II In the limestone of China Mining
Xiguoding Cements limestone is excavated in an area of km2. The benches are 15 m high and approximately five million tonnes are mined annually. Xu Xiangrong, Director of Mining Plant for TCC Jurong, notes that the DM30 II is well suited for the compressive strength of the rock (10 14 MPa). Drilling 165 mm diameter holes, the rig drills vertically for six hours per shift and two