Advances in coal mining technology ScienceDirect
1/1/2013#0183;#32;Mine Master and JH Fletcher Mining Equipment have made significant advances to improve both the speed and flexibility of this machinery. However, bolting is still a bottleneck in production, in that the present commercial method cannot keep up with the speed and distance a new continuous miner or longwall shearer can travel. Some single production longwall units can operate at rates of almost