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Surface mining
If the coal beds are relatively close together and less than 200 feet from the surface, then surface mining is considered. The types of surface mining include are, mountaintop removal, and contour mining. Huge dragline shovels (12-27 cubic yard buckets) first remove rock overburden to get to the coal. These machines stockpile the overburden until it is time to reclaim the pit. The coal is excavated from the pit floor with truck shovels and front-end loaders and then hauled to the loading area with large trucks. As the pit widens and deepens, the walls become steeper. The wall in the pit where the coal is mined is called the highwall. The back side of the pit is filled with waste rock. The highwall is benched to mine the upper coal beds, and then underlying rock is blasted with explosives for easier removal. When the pit walls are too high and steep, surface miner tries to remove coal remaining in the highwall without further excavation. Two methods of mining can achieve this feat, auger and highwall mining. Auger mining employs a 6-foot diameter horizontal auger to drill out the remaining coal. These methods are work well on flat-lying coal beds. When the coal beds dip or roll, the highwall miner is used. This new technology machine excavates a rectangular hole into the coal outcrop with a rotating continuous miner head. As the laser-guided machine extracts coal form the hole, conveyor belts transport the coal back to the surface while the mining machine advances. The remote-control machine can extract coal up to 1200 feet into the highwall. This method can safely remove coal without using miners underground.
After coal comes out of the ground, general it has been processed. However, the transports cost is very high, and the scene condition is difficult for fixed crushing plant. At this present, mobile crushing plant appear. It can eliminate the obstacles of the crushing places and circumstances, and offer the high efficiency and low cost project plants for the client. So, many miners use mobile coal crusher to process coal.
With 30 years experience in designing and making crushers, SBM mobile coal crusher has been exported to many countries and received high popularity.
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