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Gold/Mining/Energy : Global Platinum & Gold (GPGI) -- Ignore unavailable to you. Want to Upgrade?

To: Jafco who wrote (6420)	6/27/1998 11:33:00 AM
From: Bob Walsh	Read Replies (3) \| Respond to of 14226

To all - my summary (taken from Twiford's letter) of GPGI's current process: Five tons of head ore is transferred to a rubber lined ball mill and ground to a 100 mesh fineness. This slurry is then transferred to a large leach tank and leached with a simple chemical and a proprietary catalyst for 45 minutes. The pregnant liquor is then transferred to a number of smaller precipitation tanks where the pregnant liquor is precipitated with proprietary chemicals and let set until all working stopped. The solution is then filtered through a filter press and the resultant precipitant dried and weighed. The precipitant is then smelted using copper as the collector and inquarted (a industry standard procedure) with small amounts of the precious metals that are being sought (the metals added or inquarted helps "stabilize," to a certain extent, the precious metals contained in the precipitate and when the values of the metals recovered are reported the value of the inquarted metals are subtracted). The granulated copper metal containing the precious metals, is then dissolved in dilute combinations of acids and processed through a newly developed ion exchange resin, which takes the precious metals out (platinum, gold and palladium) letting the copper flow through. Then the solution is transferred to another ion exchange resin column containing a new resin that takes the rhodium out, letting the copper flow through. The pregnant resin can then be sold as is to a refiner or GPGI can "fume" (which means reduce the resin to nothing but the precious metals) and then they can be sold to refiners for further refining to the 999 purity.