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_ _ ~r~f H~21F1353~ N;ZbFi w4aa tn~af":i4' -s' ~^'d ~^•~~ <br />• • <br />BED' <br />6NO/NEERS/CONBTRUCrORS ANC. <br />M E M O R A N D U M <br />TO: Harry Posey <br />FROM: T. C. Shutt <br />DATE: April 28, 1992 <br />SUBJECT: BMG-SAN LUI&: AVR SYSTEM <br />This memo 7C a Yellow up rn T.nA t:nnVP.-`R AT.'I On ne lO yBSLerOHy 8L MLKU. <br />The present issue with the AvR is whether or not turning off the blower will have <br />any effect on the levels of free cyanide, BEI believes teat there will be no <br />discernable increase in free cyanide levels for the following reasons: <br />1, The amount aP cyanide collected from the AYR prior to the blower breakdown <br />was negligible (perhaps ten gallons par three days). This same negligible <br />amount is expected to ba collected today. Even if nothing ie collected <br />ten gallons 1n three days compared to a tailing flow rate of 1240 gallons <br />per minute is insignificant. <br />The amount of cyanide collected pre and past blower breakdown can ba <br />checked with Rich Neu of San Luis. <br />2. The measured levels of free cyanide at the spiket and all three ponds era <br />the same before and after blower breakdown. You have these results sent <br />to you daily from San Luis. <br />3. CyTox will reduce free cyanide, 1n 24 hours, to 2% of the original level. <br />The attached graphs show results from both pure chemical tests and from <br />tests at FMC Gold on their tailing slurry. At FMC there are no metal <br />WAD's to interfere with free cyanide analysis, so the datA is accurate. <br /> <br />