TIL that the deepest mine in the world, Mponeng Gold Mine in South Africa, reaches over 4 kilometers (2.5 miles) below the Earth's surface. At such depths, temperatures can reach 60°C (140°F), requiring advanced cooling systems to keep the miners safe.

https://en.wikipedia.org/wiki/Mponeng_Gold_Mine
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1fbd5zr/til_that_the_deepest_mine_in_the_world_mponeng/