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Gold/Mining/Energy : ORXX - Orex Gold Mines Corporation -- Ignore unavailable to you. Want to Upgrade?

To: Jeffrey S. Mitchell who wrote (327)	8/11/1999 3:19:00 PM
From: Tim Hall	Respond to of 2392

Jeff, There is nothing new about leaching Uranium Ore. Both In Situ and heap leaching have been around since at least 1965. Sulfuric Acid is usually the acid of choice for Uranium ore. At Utah International's Shirley Basin Operation we had a counter-current process in our mill. The loaded leachate was passed over resin columns to recover the uranium. Other mills used solvent extraction to strip the loaded leachate. Heap Leaching of Uranium ore was never widespread or very practical. There is usually a lot of clay in the ore and this makes leaching very difficult. As an undergraduate, I worked for one of my professors conducting leach tests on ore the Grants, NM area. We never could get consistent liquid flow through the samples due to the high clay content. The second part of your statement is correct. IUC said that they have never purchased or for that matter processed any ore provided by World Vanadium. Tim Hall