World's deepest mines

South Africa’s Witwatersrand gold basin dominates the list of the world’s deepest mines, claiming seven of the ten spots. Chasing ever-thinner reef seams buried beneath ancient rock, South African engineers have bored deeper than anywhere else on earth, with Mponeng Gold Mine in Carletonville holding the record at 4 km below the surface.

Raccontata daengineeringnews.co.za