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Strategies & Market Trends : Winter in the Great White North

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To: tyc:> who wrote (6887)	8/16/2005 8:40:33 AM
From: E. Charters	Read Replies (1) of 8273

A few geologists departing from the usual crowd that considers gold to aggregate in the presence of felsic rocks, from which it gets it silicic ore bearing fluids presumably have noted that mafic rocks are more often a host for gold as the felsic set. It is true that intermediate to mafic hosts are preferred to rhyolites or granites as hosts for gold. The Motherlode area of California was granitic, but most ore packers in Canada seem to be andesite-diorite, to mafic carbonates. The dolomitic green carbonates that host Timmins gold deposits are a mafic rock. Most pillow lavas are intermediate to mafic composition and pillow lavas are an ubiquitous rock nearby gold deposits. However just as close are the felsic porphryries, which are a Timmins staple as well. The spatial association of mafic rocks have been noted, but attempts to associate the rocks as a structural, geochemical host, or as a genetic source one has not yet been drawn successfully. EC<:-}

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