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To: Char who wrote (2517)	1/29/1999 2:54:00 PM
From: Tim Hall	Read Replies (2) \| Respond to of 5143

Char, This refractory ore is iron pyrite. The iron pyrite contains the gold. Leach solutions are not effective on sulfides. The pretreatment is to put the ore in an autoclave and heat to a point where the sulfur is driven off. Then the ore can be leached conventionally. However, a fire assay works on these refractory ores because the heating in the assay also drives off the sulfur. Tim

To: Char who wrote (2517)	1/29/1999 3:46:00 PM
From: Claude Cormier	Respond to of 5143

<< I am interpreting you correctly, you are saying that pre-treatment is never required to do a SFA>> This is what all the geologists I consult with on trhe matter said. <<However some ores do require pre-treatment before they can be recovered. >> Well call this part of the recovery process. Bio-leach is an exemple. << If they have to pre-treat the ore to recover it then I would assume pre-treating the ore before doing a SFA would give more accurate results results. >> Possibly but not necessarily. Bust there is a difference between getting some results with SFA and getting none. What I mean really, is that base on my conversations with several geologists, if SFA says no gold, than any process that says there is gold...is pure B.S. However, despite what the pros say, I am willing to admit that anything is possible <g>... But I prefer to wait until it is proven before jumping in. CC