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- SelO~G~d`Jd • '~P11 H~tltl3S3?! N~M WAMa ~,ld3f:tT' ~c: ea'9dflJdf <br />BE/ <br />6NalNEERB/CONBTRUCrONS INC. <br />MF ORANDUM <br />T0: Harry Posey <br />FROM: T. C. Shutt <br />DATE: April 28, 1992 <br />SUBJECT: BMG-SAN LUIS: AVR SYSTEM <br />This memo is a rol low up r.a rnw rnnvnrnar.~en na~a vgsteroav at an~rcu. <br />The present issue with the AVR is whether or not turning off the tllower will have <br />any effect on the levels of fre6 cyanide. BEI believes that there will oe no <br />discernable increase in free cyanide levels for the following reasons: <br />1. The amount of cyanide collected from the AVR prior to the blower breakdown <br />was negligible iparhaps ten gallons par three days). This Kama negligible <br />amount 1s expected to bs collected today. Evan 1f nothilt~~g is collected <br />ten gallons in three days compared to a tailing flow rate bf 12C0 gallons <br />per minute is insignificant. <br />The amount of cyanide collected pre and post blower breakdown can be <br />checked with Rich Neu of San Luis. <br />2. The measured levels of free cyanide at the splket and all tlhrse ponds are <br />the same before and after blower breakdown. You have thole results sent <br />to you daily from San Luis. <br />~. ~~ <br />3. CyTox will reduce Pres cyanide, 1n 24~hours, to 2X 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 therel are no metal <br />WAD's to interfere with free cyanide analysis, so the data is accurate. <br />