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Nov 28, 2018018332Longwall mining is more efficient than room and pillar mining, but the equipment is more expensive. Surface Mining For extracting coal which lies close the surface, huge drag-line shovel machines remove the topmost layers of soil and rock, exposing the coal, which is then removed by smaller machines.
LAWFIRM Heavy Industries Co., Ltd. China(Mainland)
Our products sell well all over the world, and have advanced technology in the field of crushing sand grinding powder.