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Gold/Mining/Energy : Desert Dirts, Gold & Platinum, the emperors new clothes -- Ignore unavailable to you. Want to Upgrade?

To: Aurum who wrote (1446)	5/23/1998 11:23:00 AM
From: Tim Hall	Respond to of 1913

Aurum, You are right. What can I say. But then you must not be familiar with Desert Dirts. They are like the rest of the desert, they are very mystical and tempermental. VBG Tim Hall

To: Aurum who wrote (1446)	5/24/1998 4:19:00 AM
From: Aurum	Read Replies (2) \| Respond to of 1913

Correction!! Some PGEs do alloy with gold over fairly wide limits of composition (I don't know about iridium). What I had in mind was an occasion when I melted some alluvial gold that contained some platinum grains, and possibly some osmiridium grains. These PGE grains floated on the surface and did not appear to alloy - but I suppose the temperature may not have been high enough. My post was not clear - the point I was trying to make is that any interference caused by iridium in a standard fire assay would be a positive interference (in the case where the assay prill is weighed). If the final determination of the gold is done by atomic absorption spectrophotometry, or any other spectroscopic technique, the iridium will not interfere. The only thing that might cause trouble is the insolubility of iridium in aqua regia - but no competent assayer would be caught by this.