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Gold/Mining/Energy : Precious and Base Metal Investing -- Ignore unavailable to you. Want to Upgrade?

To: Elizabeth Andrews who wrote (26269)	1/2/2004 2:14:33 PM
From: E. Charters	Read Replies (1) \| Respond to of 39344

Well it is based on knowing people who sampled the tails and were familiar with the Highland Valley operation. There is something you would have to know about copper mining, assaying and milling. It suffers at low grades from the very same problem gold does in determination of tails grade. The mills then were set up for a certain grade, and they would becaus the flotation was just so capable not recover anything beyong a certain grade. Losses to tails were never discovered. They thought the heads were about 0.5% and in fact they were because of the sporadic bornite nuggets, closer to 1.0%. This meant that their recovery of about .4% put almost 0.6% in the tails, which is in fact higher grade than the Kemess heads. I would not expect you to know or believe this. You would have to be a seasoned industry professional, and also aware of this aspect of mining and milling, of which not too many engineers are familiar with. If you think it's really baloney, go up there and test the tails and prove me wrong. <font color=crimson>:)</font> EC<:-}