Brian Fox, Aleksey Chernov, Dmitry Sizov
The global mining industry has for long years made use of highperformance rotary drilling rigs for process boreholes. Such drilling rigs supplied to a great number of ore open pits were furnished with electric drives and long drill towers for single-start drilling of a borehole (with a single drill-rod). Today, such options are incorporated in the design of smaller-size machinery. The article discusses the advantages and different aspects of single-start drilling.