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Gold/Mining/Energy : International Precious Metals (IPMCF)
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To: O. H. Rundell who wrote (2430)2/15/1997 6:45:00 PM
From: Bill Jackson   of 35569
 
OH: there are a number of problems here. The compound ofs ilver, gold and Tellurium(petzite). how dense is is?? For the Knelson to work the rock and the metal have to differ indensity by a significant amount. I do not know the density of petzit, if it is the same density as quartz, then game over. It will not work. Metallic platinum and metalli gold are among the densest metals, around 20 times as dense as water. Rock is around 2.8(quartz, carbonate) times as dense as water. You get a very good separation there. Lakefield Labs near Peterboro has a complete Knelson lab scale setup and will test any mix any way you like for a very reasonable fee. A test on 100 lbs should be under $2500, plus assay costs. They will grind it into a number of size sorted fractions by mesh size. Take each one of thos fractions and use the Knelson concentratot on it, analyse what you get out of the top and bottom for each size range and give you a report. The Davidson mine
sent in a sample and it was 85% recoverable for gold with simple crushing.(we have free gold in qyartz) If the petzite is very low in density like the host rock(host rock is the rock all around the metals you want to get out), then the Knelson will not owrk. If there is a large density difference then the only reason it would not work was too great a size range for the density difference to matter as the major classifying factor. Did they get some of the gold out but lost most/half of it to the tailings??
Bill Jackson
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