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Gold/Mining/Energy : Western Copper Holdings Ltd. T.WTC -- Ignore unavailable to you. Want to Upgrade?

To: Peter Watson who wrote (400)	4/28/1999 10:00:00 AM
From: Elizabeth Andrews	Respond to of 401

I was under the impression it was a poly-metallic sulfide deposit. (copper-zinc-silver-gold)? This means that it will produce at least one concentrate. This is where it gets a bit tricky as the mill circuit may have to be designed to produce more than one concentrate due to this deposits' mineralogy. Since there will be a large volume of concentrates to ship, which is expensive, it's best to have good recoveries of gold as this enhances the value of a ton of concentrate. It appears there may be a problem with gold recoveries. The mineralization is very fine grained which can mean that it has to be ground very fine to recover the economic minerals. I've heard that the grinding circuit is the single most expensive part of the milling circuit. The volume of overburden also appears to be a problem if this is going to be an open pit. All of these factors may mean that economics of this deposit are problematic.