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Gold/Mining/Energy : ECHARTERS
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To: Lew Green who wrote (1792)11/14/1997 4:51:00 PM
From: E. Charters  Read Replies (1) of 3744
 
Basically he like Coggins is in denial about hydrothermal pt deposits... even though in part of his previous post where he tried to dazzle us with some science (that sure sounds like someone wrote for him, or he found a book to copy some paragraphs out of)Mr. Chatters himself refered to hydrothermal pt. You can have such without ultramafics.

BZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ wrong.

They may not be in the vein but they are in the host rock and source
rocks. What have you got against mafics? They are just dark, they can't help it. Besides it's shorter than dark iron-magnesium rich rocks.

I have actually worked on hydrothermal PT veins and nickel veins that were subaqueous hydrothermal vent related precipitated systems.

Their host is peridotite which is an iron silicate with small amounts of feldspar. Peridotite is a mantle rock. That means you find it on your mantle.

There are only two type of rocks in the planet. Mafic and felsic.
Some want to divide them up finer with the alkali metals defining some
and magnesium quantities or iron defining others. This is not to say there aren't all kinds of sediments. I am talking about melt rocks that bring orebodies. So all the existing platinum mines are in mafic rocks or their ore source is a mafic rock. As a matter of fact, silver and gold report preferentially to these rock hosts as well with some running to the intermediate phase. The simple reason for this is that iron rich rocks are richer in all heavy metals and would have a tendency to source those metals preferentially. Lighter metals may report to felsic rocks creating your well known copper zinc association with felsic rocks that are richer in silcon, aluminum and
potassium. Interestingly most iron ore deposits will associate as sediments with felsic rocks. Which is a bit of a conundrum.
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