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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers
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To: Condor who wrote (66599)8/4/2009 10:12:31 AM
From: hank2010   of 78419
 
I have found he knows his stuff, Condor, but we are all beneficiaries and prisoners of our own experiences.

I have not been undg at Dome for a long time and not down to 7000 feet. Creighton (Inco Sudbury) at 8000 was uncomfortably warm despite ventilation and refrigeration of air by drawing it in across ice in the open pit and access drifts to the pit.

Nuetrino lab at Creighton, also one in US at Homestake, in South Dakota. Homestake mine wall rock temp is about 135 degrees at 8000 feet deep. I do not remeber any serious water problems. Homestake is less than 100 mi from Wyoming border.

I recall temperature gradient in Northern Ontario was in range of 180 feet per fahrenheit degree. i.e. temp increased 1 degree every 180 feet you went down, starting at about 45 degrees when 10 feet down (below the frost line). In B.C. Bralorne was very hot at relatively shallow depths due to gradient in the 60 foot range???

South Africans are leaders when mining to depth. 11,-12,000 feet but refrigeration of air is required.

Water may be a problem. It was in Sask. potash until they froze the Blairmore formation to get through. Water was a problem at Caland Ore in Atikokan,Ontario requiring large pumps, but their underground costs (caving) were less expensive than their open pit costs.

When I first went to Arizona, opening new little mine, guys from State asked me "what about water problems?" I said "no water problems, it is dry" They answered "exactly!"

Old cowboy story about Nevada (the state not the poster!). "What do you mean there is no water in Nevada! Name me another state where there are 3 rivers flowing into the state and none flowing out"
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