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Gold/Mining/Energy : Twin Mining (formerly Twin-Gold) -- Ignore unavailable to you. Want to Upgrade?

To: Letmebe Frank who wrote (374)	3/20/2002 10:24:49 PM
From: WillP	Read Replies (1) \| Respond to of 613

Actually, I didn't quite say it would be difficult to attain $75 (U.S.) per tonne. I said it would, if the grade was low. If the sample turned out to have a 0.5 carat per tonne grade, then you only need $150 (U.S.) per carat. That's certainly not unrealistic. Yes, those are my words, but some clarification may be in order. That was one of a number of paragraphs talking about diamond value, as I recall. The sentence, "That's certainly not unrealistic," refers to a value of $150 per carat, not a grade of 0.5 carat per tonne. Should the current Twin sample achieve a grade of 0.5 carat per tonne, I would be pleasantly surprised, if not shocked. If I had to deviate from a 0.2 carat per tonne guess at this stage, my senses tell me to go somewhat lower. If the stone quality lives up to billing, and the coarse sizes are there, I have no concern over $150 per carat, however, or even a bit more, assuming they don't include shrapnel to bump up the grade -- say a 1.2 or 1.5-millimetre minimum cutoff. But, like the rest of you, I'm watching and waiting...

To: Letmebe Frank who wrote (374)	3/21/2002 3:12:37 PM
From: VAUGHN	Read Replies (1) \| Respond to of 613

Hello Letmebe Frank Your welcome. Here is a graphic that may help: agc.bio.ns.ca Regarding your comments: So a deep mohorivicic discontinuity over a large area would define a craton? No, but it would be consistent with a craton. I believe jpthoma1 gave you a good definition of a craton in his post (358) Archaean craton, is continental crust older than 2.5 billion years in age. Archaean cratons have relatively cool lithospheric roots in which there exists a downward deflection of isotherms and a corresponding upward deflection of the diamond stability field. This region of high pressure and relatively low temperature (less than about 1200 o C) provides a “window“ in which diamonds can form and be preserved. See: geology.iastate.edu litho.ucalgary.ca You may also find this discussion of interest/relevant: litho.ucalgary.ca On a separate but related note, see discussion of Archean geotherms under RESULTS AND CONCLUSIONS: es.mq.edu.au The last URL goes to my comments regarding Sommerset Island kimberlite geotherms. Whether JI kimberlites have the same or lower geotherms has yet to be reported. I asked Rothwilda to provide that data but she declined expressing concern that "it would give the competition a valuable insight that TWG was not prepared to give." Hope the above addresses any questions. Regards Vaughn