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

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To: Claude Cormier who wrote (8232)	3/21/2006 3:18:06 PM
From: E. Charters	of 78419

I did not no dat. But apparently so... galleries.com I think it more a matter of the oxidation regime of the environment than the rock host of the deposit. Chalcocite occurs as a secondary mineral in many ore bodies in a zone called the supergene enrichment zone. Called a secondary enrichment mineral, although also a primary mineral as well, chalcocite commonly forms from the alteration of primary copper minerals that are attacked above the water table by oxygen. The oxygenated copper fluids descend to the water table where a reaction with primary ores results in the copper being reduced back to a sulfide, most commonly chalcocite. Ore bodies will have a layer of chalcocite which corresponds to the present or a past water table level and this layer is called a "chalcocite blanket". The chalcocite blanket is richer in copper than the upper oxidized portion of the ore body and usually richer than the primary unaltered ores below. The chalcocite blanket represents a real gold mine, or should that be copper mine, to the copper prospectors.

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