Talk:Porphyry copper deposit

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I removed the following, prior toa bit more discussion:

Low-grade but very large "porphyry uranium deposits" have been studied as future resources. The most well-known of this class is the Rossing deposit in Namibia.

F. C. Armstrong (1974) Uranium resources of the future-"porphyry" uranium deposits, in Formation of Uranium Ore Deposits, Vienna: International Atomic Energy Agency, p.625-635.

As far as I am aware, the Rossing deposit is hosted within an alkaline granitoid, heavily modified by metamorphism, which is not technically in line with most porphyry copper deposits, given a lack of alteration similarities, metal zonation, etc. As far as I recall (being in South Africa, not my usual haunt in australia, and away from my literature) that the uranium resides primarily in phosphates such as apatite, monazite, etcetera. This is again, not really a 'porphyry' style deposit as the type of magma (alkaline silica-undersaturated and highly potassic) is not at all the same.

I am, however, merely ecouraging someoe to come and say why it should be included ere, versus under perhaps its own class, where it currently more or less resides. The search for another Rossing has been long and unfortunetely rather fruitless, meaning, again, anging it on the coathanger of a porphyry deposit is drawing a rather long bow...it is like claiming that the Olymic Dam deposit isn't now an IOCG, it's a porphyry uranium deposit. Rolinator 16:22, 7 April 2007 (UTC)

I had put it in based on the cited reference, but if it doesn't belong, then leave it out. Plazak 16:50, 7 April 2007 (UTC)