
mar 31, 2021 47-5041 continuous mining machine operators. operate self-propelled mining machines that rip coal, metal and nonmetal ores, rock, stone, or sand from the mine face and load it onto conveyors, shuttle cars, or trucks in a continuous operation. national estimates for continuous mining machine operators. industry profile for continuous mining,30 cfr 75829 tramming continuous mining machines,in addition to the power center specified in 75.825, the following power sources may be used to tram the continuous mining machine. (1) medium-voltage power source. a medium-voltage power source is a source that supplies 995 volts through a trailing cable (see figure 1 of this section) to the continuous mining machine.