https://www.cbc.ca/news/canada/sudbury/
The Onaping Depth project will be 2,500 metres below the existing Craig Mine
To extend its Sudbury, Ont., mining operations to 2040, Glencore plans to go very deep underground. The mining giant expects its $1.3-billion Onaping Depth project to be fully operational by 2025.
The new mine is being built around 2,500 metres below the former Craig Mine, which shut down in 2009.