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Gold/Mining/Energy : ECHARTERS

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To: Al Cern who wrote (2099)	12/31/1997 8:14:00 PM
From: E. Charters	Read Replies (1) of 3744

1. Release size. Amount of grinding. Bears on media use and electricity. Also fines production plays havoc on flotation and Merril Crowe cyanide system. Many factors here. 2. Metallurgy. Is gold accompanied by sulfides, what kind? copper, zinc? Carbon? Can kill cyanide. Reagant consumption. Cyanide costs money. Sulfide are also extremely hard to grind. 3. Bond work index of ore? Is the ore hard, tough, expensive to grind? 4. Is gold atomically bound by arsenides or pyrite. Will take autocalving or acid treatment. That is the free milling versus semi refractory concept. There are a wide variety of types of ore as well as recovery techniqes and costs. Gold can be leached from some very porous but hard ores that only ahve to be crushed. Capital costs and thoughput is very simple. Other ores require a lot of crushing and grinding and chemical treatment. Then there is mining. Its quite another thing. And there are many many factors here that inter-relate. EC<:-}

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