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which machine is used for coal mining

which machine is used for coal mining

For extracting coal which lies close the surface,huge drag-line shovel machinesremove the topmost layers of soil and rock, exposing the coal, which is then removed by smaller machines. Surface mining may involve removing sections of hills or top layers of a flat surface area. The layers of rock and dirt covering the coal are reserved for until the coal is removed, at which point the the dirt and rock is …

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