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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. (well), a circular mining excavation more than 5 m deep and usually between 75 and 300 mm in diameter, made by a drilling rig.Boreholes are drilled from the earthâs surface and from underground mining excavations at any angle relative to the horizon.Three parts are distinguished: the head (mouth), bottom (face), and shaft. Borehole depths range from a few to 9 km and more.orehole. (well), a circular mining excavation more than 5 m deep and usually between 75 and 300 mm in diameter, made by a drilling rig.