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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.
Once the mining is finished, the dirt and rock are returned to the pit, the topsoil is replaced, and the area is replanted. Underground mining, sometimes called deep mining, is used when the coal is buried several hundred feet below the surface. Some underground mines are 1,000 feet deep.To remove coal in these underground mines, miners ride elevators down deep mine shafts where they run machines that dig out the coal.nce the mining is finished, the dirt and rock are returned to the pit, the topsoil is replaced, and the area is replanted. Underground mining, sometimes called deep mining, is used when the coal is buried several hundred feet below the surface. Some underground mines are 1,000 feet deep.