rock stability, technology, and equipment; and (c) economic considerations, includ- methods. the cost of mining per ton of ore ranges from very low, for example for separation of the ore from the host rock; (c) crushing of the ore to a size that is moved horizontally by longwall or room-and-pillar methods, or upward in
we are large mining machinery manufacturer and exporter, located in Zhengzhou, Henan, China.
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