That's what was said, so i had a look. This search brought up the Kidd site for Copper and Zinc.
http://en.wikipedia.org/wiki/Undergr... )
"Deepest mines
- The deepest mines in the world are the TauTona (Western Deep Levels) and Savuka gold mines in the Witwatersrand region of South Africa, which are currently working at depths exceeding 3,700 meters (12,139 feet). AngloGold plans to increase the maximum depth of these mines to 3,910m (12,828 feet) by 2009.
-
The deepest hard rock mine in North America is Xstrata's Kidd Mine, which mines copper and zinc ore in Timmins, Ontario. Mining is actively occurring 2,682m (8,800 feet) below surface. The shaft bottoms out at over 2,926m (9,600 feet) down.
- The deepest hard rock mines in Australia are the copper and zinc lead mines in Mount Isa, Queensland at 1,800 m (5,906 feet).
- The deepest platinum-palladium mines in the world are on the Merensky Reef, in South Africa, with a resource of 203 million Troy ounces, currently worked to approximately 2,200m (7,218 feet) depth.
- The harshest conditions for hard rock mining are in the Witwatersrand area of South Africa, where workers toil in temperatures of up to 45 °C (113 °F).However, massive refrigeration plants are used to bring the air temperature down to around 28 °C.
Or better yet, go and read pages 5 and 6 of this link.
http://www.nrcan.gc.ca/mms/cmy/conte... .
