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aPR o- •~~ ~~s:~~aPri <br />P. 1'd%~ <br />Figure 3 compares CyTox 11 to ferrous sulphate when the starting slurry contained <br />75 ppm CN`. Even though, after c4 hours the results are similar, in the initiai <br />stages ferrous sulphate is more effective as a neutralizing agent. <br />One field test was run with the same gold producer at their plant in Nevada. <br />Unfortunately their tailings pond is very small, xith an estimalted 4-6 hours <br />retention time, so the eventual ppm CN- remaining 1n the pond is higher than <br />might normally be expect.3d. Zn addition, the field trial was run with CyTox 11 <br />when CyTox 6 would have given much lower CN~ levels. However, the results of the <br />3~ day field trial are very close to those predicted from the laboratory results, <br />see Tab 1e 1. <br />Using CyTOX 6 instead of CyTox 11 would have towered the CN ppm to approximately <br />10-15 at the pond exit. <br />USE IH HEAP DETOX <br />Leach column tests will commence in fete February 1992 in three laboratories, two <br />of which will be in the laboratories of gold producers. <br />for this application, where CN neutralizing time is less imporCant than it is <br />in tailings ponds, CyTox 11 shall be used because it is non-oxidi¢ing and Towers <br />Fe levels, in addition, perhaps, to lowering other heavy metal levels. <br />r~~ <br />