Sonic drilling employs a high frequency, rotary vibratory drill that is designed to fluidize, overburden, and fracture rock faces. This process results in seamless casing advancement or continuous core samples that can be accessed without the application of drilling fluids.
[pdf] There are many different types of drill bits, each designed for a specific purpose. However, the main factor determining which drill bit to use on rock is the hardness of the material. The harder the rock, t.
[pdf] On September 13, New Concept Mining (NCM), a division of Swedish company Epiroc, opened its Hydraulic Rock Drill (HRD) production facility in Aeroton, Johannesburg. NCM is a ground support solutions supplier based in South Africa.
[pdf] 
