deep mining"Several deep mines in Ontario will soon reach below 8,000 feet (2,500 metres). South Africa operates the deepest mines in the world, at 10,000 to 13,000 feet (3,000 to 4,000 metres). Anglogold’s Western Deep Levels mine in South Africa is the world’s deepest mine at 12,300 feet (3,777 metres).
At the present time, Ontario operates close to 60 hoisting plants.
“We’re seeing that shallow ore bodies are disappearing quite quickly,” he says.
The wave of the future, he believes, will be in exploring for, and exploiting, deeper and deeper mines."
https://www.nob.on.ca/HealthSafety/headlines.asp?159id115-pn=&view=30425