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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.
Even though that costs even more, an. opencast mining would not be used for that deep excavations and. that process is called âdeep mining. When it comes to design of a mine shaft, there are two options: circular shafts and horizontal shafts (Figure 1, Figure 2). Circular shaft is the most commonly used one. If the shaft should. be deep and shaft diameter is supposed to be more than 4.5 meters, circular shafts are the best choice.