Experiments with hot drilling for mining quartzite

Conclusions Quartzites from the pit of the Pervourals Dinas factory can be effectively broken up with the thermal method.The effective rate of input of the thermal bit is 7–9 m/h in the broken-up part of the massive. The upper 3–4 m can be drilled with a rate of 5 m/h. The most effective rate of drilling for the thermal bit is 10–12 rpm.Drilling with a hot-drilling machine in small deposits of quartzites is possible only in conditions of complete dust suppression.Questions connected with the extension of the drilling frame and the formation of depressions are of practical interest and work in this area will be continued.