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

To: Tim Hall who wrote (1566)	7/20/1998 5:33:00 PM
From: go4it	Read Replies (2) \| Respond to of 1913

Tim, Do you know what kind of assay results Newmont got with their invisible gold in the Carlin trend? Also do you know how recovery correlates to the assay results? I have looked for this information and can't find it. If heap leaching was not a black box technology, is it safe to say that it was controversial or is this incorrect as well? Chuck

To: Tim Hall who wrote (1566)	7/28/1998 1:07:00 AM
From: Aurum	Respond to of 1913

Heap leaching of copper ore is recorded in 1752 at Rio Tinto, Spain. Small scale heap leaching of gold ores dates back to the early years of this century - if not before. I came across an interesting paper that demonstrates that heap leaching was fairly sophisticated back in the 1930's - even though it was not used in any major operations to my knowledge prior to the 1970's. The paper is: T.P. 790. A.I.M.E. by O.C. Shephard and C.F. Skinner. (1937) "Stabilizing agglomerated slimes for cyanide leaching.