The room and column method is used to mine horizontal and gently inclined ore bodies, but it is more......
The year of 2017 marks the tenth anniversary of the release of the J6 truck released by FAW a......
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The root of the original soil sampling drill, the correct name should be the root of the......
The main features of the stage forced collapse method are: one-step recovery, with a medium-deep ho......
Kaolin is a general term for a group of clay minerals. Its basic composition is kaolinite group and......
The bottoming method has two methods: shallow hole bottoming and deep hole bottoming (see Figures 1......
Most experts believe that the primary industry ......
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