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Underground coal mining began in Wyoming during the 1860s. Many of the early coal mines were not designed and constructed well; as a result the underground pillars failed. If enough pillars failed, the caprock in the mine would collapse, and the effects of the collapse would reach the surface in .

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Equipment Beam Stage Loader and Crusher. When the coal has been hauled to the maingate, it then has to be transferred through a 90 o turn, and loaded onto the maingate conveyor. This function is carried out by the "Beam Stage Loader or BSL", which is another scraper conveyor, in this case with steel plates on both sides and runs from the maingate drive to the maingate conveyor (belt).

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Underground, stage loaders, crushers, motors, gearboxes and fluid couplings of conveyer power units are mounted in steel frames which are sitting on the floor of the mine. In some mines, the equipment may even operate partially submerged in mud. The typical practice of mines is to overhaul equipment is to replace bearings, seals, motors and fluid

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Equipment. As the shearer removes the coal, the AFC is snaked over behind the shearer and the powered roof supports move forward into the newly created cavity. As mining progresses and the entire longwall progresses through the seam, the goaf increases. This goaf collapses under the .

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Underground mining (hard rock) WikipediaUnderground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, ir. MENU. Home; About Us; ... ( portable crusher ),which is the crushing equipments for rocks and construction waste, and ...