Where: 90 km SW of Johannesburg, Gauteng province, South Africa
Mine Type: Gold
Operations: 1986 to current
Owners: Harmony Gold since October 2020
Output: R4 - 750 million (South African Rands) worth in Gold
Notable Facts: This is the world's deepest mine at over 2.5 miles below the earth's surface. To get to the bottom of the mine, the ride takes over an hour. In 2008, researchers found a previously undiscovered bacterium called Desulforudis audaxviator a few kilometers deep in the mine.