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Aug 22, 2010· Borehole Mining (BHM) is a remote operated method of extracting ( mining ) mineral resources through boreholes by means of .
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Apr 21, 1977· The borehole hydraulic coal mining system accesses the coal seam through a hole drilled in the overburden.
A borehole is a narrow shaft bored in the ground, ... to advance in situ sampling equipment, ... the Chinese used deep borehole drilling for mining and other projects
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