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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers

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To: Claude Cormier who wrote (8228)	3/21/2006 2:47:25 PM
From: E. Charters	Read Replies (1) of 78419

Chalcopyrite is oft found in rhyolites, but this is chalocite which is most frequently associated with the oxide portion of porphyries, or some highly oxidimated deposits sui generis. Hence the term "oxide" or "chalcocite blanket".. The deposit types are volcanic, in/ex truding late (cretaceous?) sediments. The nevada Porphyry coppers were related to intrusive granites intruding sediments. Ken Darke thot they were sediment coppers re/concentrated/mobilized by the intrusives. Chalcocite deposits are cheap to mine, it is very concentrated and easy to electrowin. EC:<-}

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