Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically – m thick). The longwall panel (the block of coal that is being mined) is typically 3 – 4 km long and 250 – 400 m wide.
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الحصول على السعرAlluvial diamond mining is the term used to describe the process through which diamonds are recovered from such deposits of sand, gravel and clay. Large concentrations of alluvial diamond deposits are mined on an industrial basis.
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