The wall filling method is a type of dry filling method. When mining a very small thickness of a fi MORE

At present, the domestic steel market downturn, how to reduce the ratio of mining cut, effective con MORE

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Iron ore body located in a marble and diorite contact zone, or within the vicinity of marble, metal MORE

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Northwest iron ore is one of a large open-air iron mine. The height of the mining stage is 12m, and MORE

Meishan iron ore has been used Sublevel caving mining method, after decades mined different intensit MORE