Mining the material in precisely the required thickness is crucial for the selective mining of rock layers. Auger - A rotary drill that uses a screw device to penetrate, break, and then transport the drilled material coal. Subsidence — The gradual sinking, or sometimes abrupt collapse, of the rock and soil layers into an underground mine. Skip to Left Navigation Bar. Working section - From the faces to the point where coal is loaded onto belts or rail cars to begin its trip to the outside.
Environmentalists says enforcement has failed; industry cites bureaucracy
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Various constructions of wire rope are designated by the number of strands in the rope and the number of wires in each strand. Also applies to the man who operates the machine and to workers engaged in the cutting of coal by prick or drill. Fan signal - Automation device designed to give alarm if the main fan slows down or stops. Source: Diplomat Mine Interpretive Site. From to most of Oklahoma's coal production came from underground mines. Our on-line publications are scanned and captured using Adobe Acrobat.
Surface Mining | The Encyclopedia of Oklahoma History and Culture
In the past, strip-mined mineral deposits that became exhausted or uneconomical to mine often were simply abandoned. Also, a highly sensitive, encapsulated explosive that is used to detonate larger but less sensitive explosives. Related: Environment Advertise. Immediate roof - The roof strata immediately above the coalbed, requiring support during the excavation of coal. Car - A railway wagon, especially any of the wagons adapted to carrying coal, ore, and waste underground.