The deepest mine ever built by humans is the TauTona gold mine in South Africa, which has a depth of nearly 4 kilometers. The second deepest is the East Rand mine, which is 3.6 kilometers deep, and is also a gold mine in South Africa (although much older than TauTona; East Rand is over a century old). These mines are so deep that air conditioning has to be used to cool the temperatures (which increase as you get closer to the Earth’s center) down for workers; rock face temperature routinely hits 60 degrees Celsius.
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