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Gold/Mining/Energy : ECHARTERS
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To: Diamond Daze who wrote (1817)11/15/1997 9:28:00 AM
From: Bill Jackson  Read Replies (2) of 3744
 
Chris; The key is time, even low grades can be heap leached if you set up a low cost system with minimal manning and let it operate for a longer time. You might need to have a pre-leach phase of bacterial oxidation for a year or so to expose the precious metals to subsequent leaching. A plastic collector sheet, graded and with drainage pipes to a low point, along with a pump house and a bacteria breedup innoculation tank to start. Periodic pumping via spray nozzles over the broken down ore, and wait for the bacteria to eat the sulfides. Then after you have exposed enough, you start the leach, and that runs semi continuously for a year or more with the gold collecting in the liquid and being extracted from there from time to time. Fence it and it will run un attanded for a year or more(if properly set up of course), so it has low costs.

Bill
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