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Gold/Mining/Energy : Precious and Base Metal Investing -- Ignore unavailable to you. Want to Upgrade?

To: loantech who wrote (13460)	7/4/2003 4:07:53 PM
From: hank2010	Respond to of 39344

No, Tom. Maybe our definitions are different. In these parts, the term free gold means gold that can be recovered by gravity methods (which would involve some type of comminution such as grinding, as in a mill, prior to the gravity recovery). For heap leaching the concern is usually whether the gold can be dissolved by the cyanide solution. Oxide ores are usually no problem as the oxidation of the sulphides leaves a porous rock, Sulphides may or may not be heap leachable. Some that are not heap leachable may also be refractory (and can not be treated in a conventional mill) and have to be roasted or pressure treated. And some ores have to be milled (ground up) because the rock matrix which holds the gold is not permeable to the cyanide solution at heap leach sized particles. but I thought AQI was considered heap leachable.