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Gold/Mining/Energy : International Precious Metals (IPMCF)
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To: AurumRabosa who wrote (2012)2/8/1997 1:27:00 PM
From: Bill Jackson   of 35569
 
Ron; Got your note and read some thread. I am not sure if they are going to Agitated vat leach the wholedeposit bit by bit, or run it through a concentrator(Knelson ??) and leach the concentrate.Any operation like this will have custom built agitation vats, and they could be very large here, swimming pool size. The grade is low so large volumes must be handled with minimum pumping and machine costs, labour costs, and leaching agent consumption/recycling. There was a comment about the failure of some kind of Knelson test? They have to make sure what they put through the Knelson is in a narrow size range
so the different terminal velocity in water of each particle truly indicates it's specific gravity. If a wide range of sizes is used, then you get a bad separation. For leaching the chemical has to penetrate the rock, form a complex with the gold or platinum and then leave. All these are slow processes, controlled by the porosity of the particles, concentration gradients etc. Some rock is very impermeable and the leaching solution takes too long to get in and the complex(which is larger) takes too long to get out. So the leaching process takes 2 years, and you want it to take 2 hours. So you grind the rock finer(adding costst) and yoy increase the speed at a cost. If you grind too finely you get filter clogging fines/slimes, too coarsely takes too long or gives low recovery. The company is heading in the right direction. They have a massive resource and if they can solve the extraction problem you have a bonanza, if not desert dirt. I would have to speak to them. I note they are in Toronto, so I will go to the HO and get some data and see what I can determine.
Bill Jackson
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