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Gold/Mining/Energy : ECHARTERS -- Ignore unavailable to you. Want to Upgrade?

To: CLK who wrote (2440)	3/18/1998 11:35:00 PM
From: E. Charters	Respond to of 3744

Nothing. Rhyolite is a rock type that hosts relatively few Gold orebodies. This does not make it harder to assay. Mafic rock is by far the commoner host. But lots of Gold orebodies associate with felsic crystal tuffs that are called porphyries. I would say there is a chance that the orebody is smaller or more discontinuous than the mafic associated type. But one hard and fast rule in this game is: make no hard and fast rules. Hemlo was considered "strange" as it associated with rocks whose metamorphic grade was amphibolite facies rather than the more common greenschist facies. So gold precipitation was not assumed. But the grade of the vein was retrograde to greenschist facies. And the true statistic is 15% of all Gold mines in Canada are hosted in Amphibolite rocks. And some of these types were nearby Hemlo and mined out before Hemlo was "found". Also some of the most common micas in Hemlo were sericite and fuchsite These are indicators in other camps of gold association. So retrograde toward the vein could be easily seen and cutoffs at depth need not have been assumed. Perhaps potential should be tested first and assumed later. ---------------------------------------------