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At the New Almaden quicksilver mine, in California, at a depth of about 600 feet the temperature was very high - some 115 degrees; but in the deepest part of the same mine, 1,800 feet below the surface and 500 feet below sea level, the temperature is very pleasant, probably less than 80 degrees.
Borehole Mining (BHM) is a remote operated method of extracting (mining) mineral resources through boreholes by means of high pressure water jets.This process can be carried-out from land surface, open pit floor, underground mine or floating platform or vessel through pre-drilled boreholes. A borehole is drilled from land surface to a desired depth, where then actual borehole mining will take place. 2  A casing column is lowered down the hole.