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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.
Geologists calculate that, for every mile you dig beneath the Earth's surface, the temperature rises 15 F and the pressure increases simultaneously at a rate of about 7,300 pounds per square inch. Violations of the 15-degrees-per-mile rule are unknown and constitute the notorious forbidden zone.