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Gold/Mining/Energy : Yamana Resources INC. T- YRI -- Ignore unavailable to you. Want to Upgrade?

To: The Barracuda™ who wrote (929)	2/21/1998 5:24:00 PM
From: Greg W. Taylor	Read Replies (1) \| Respond to of 2346

Matt was talking about the extreme hydrothermal alteration he was seeing in the rocks. I'd suggest a conversation about this with a geologist (which I'm not.. perhaps Walt elsewhere on SI, could help) would give you greater satisfaction. Basically though, extensive alteration like this means that there was a great deal of igneous activity related usually with superheated water which, in turn, can break down normally insoluble substances (in addition to the silicates). This activity is what carries and concentrates the minerals to create a deposit, often to the top of an intrusion. Dick Walters said that what he saw at Lejano was the most dramatic hydrothermal alteration he had seen anywhere within the Santa Cruz area, perhaps in the country (I don't recall)and Dick has been operating around Argentina for about a decade. Yamana got started there. It's just another good sign. The trick is not only finding the heat engine, but in finding the concentration of the mineralization and in it's NOT being supergene enrichment (which we do not feel this is, especially since we have not even reached the sulfide contact yet), as this gives a false reading. (It seems this stuff is almost as complicated as a high school relationship.) Hope this helps. Greg

To: The Barracuda™ who wrote (929)	2/24/1998 12:48:00 PM
From: Greg W. Taylor	Respond to of 2346

To: Greg W. Taylor (338 ) From: Walt Monday, Feb 23 1998 9:40PM EST Reply # of 340 It sounds like a pretty good explanation to me. The trick is that "nuked" is not a geological term but a descriptive one used by the field geologist. It is tricky in the field sometimes coming up with the right terms. Alteration, mild,moderate, heavy severe....then you see something that makes severe look mild. so it looks nuked:) The hydrothermal solutions are hot, full of minerals and acidic and often under alot of pressure so when they flood into an area they can really do a number on the existing rocks. As they cool and/or pressure is released they deposit the minerals or if they hit a basic layer. Lots of variables to deal with. In someone's field notes I read once an alteration zone was described as looking like "Gods boiler had burst on a forty below night" not very geological but certainly descriptive. Best of luck as you explore natures plumbing system, it sounds like a great alteration zone. regards Walt