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-~'~' 6't'o '7N~ HO:1ti3SHM NHZtlFI WOHa ld~i~YT' 3G: CZ'il.~tlC <br />:.~ ~ ~ <br />BEr <br />ENGiINEERB/CONBTRUGTOAB lNC. <br />T0: Harry Posey <br />FROM: T. C. Shutt <br />M E M O R A N D U M <br />DATE: April 28, 1992 <br />SUBJECT: BMG-SAN LUIS: AVR SYSTEM <br />This memo is r Tn~low up rn rna f:nnVP.1'RRiinn Halo yesterosy ai IMLKU. <br />The present lesue with the AvR is whether or not turning off the blower will have <br />any affect on the levels of free cyanide. BEI believes that there will oe no <br />discernable increase in free cyanide levels for the following rlaasons: <br />1. The amount of cyanide collected from the AVR prior to the blower breakdown <br />was negligible (perhaps ten gallana per three tlaysl. This game negligible <br />amount is expected to be collected today. Even if nothi~hg is collected <br />ten gallons in three days compared to a tailing flow rate bf 1200 gallons <br />per minute is insignificant. <br />The amount of cyanide collected pre and post blower breeakdown can be <br />checked with Rich Neu of San Luis. <br />2. The measured levels of free cyanide at the sp1ket and all three ponds nre <br />the same before and after blower breakdown. You have thole results sent <br />to you daily from San Luis. <br />3. CyTox will reduce free cyanide, 1n 24 hours, to 2X of the griginal 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 therb ors na metal <br />WAD's to interfere with free cyanide analysis, so the data 15 accurate. <br />Irnnnah d Cuqu 9pn .777 9n~0~ IN eA.....wt Plvd . ~ ebe . - (~.~... ~., ar+.. ..~. _~.._. r,,., ... ~. ~ I _...._. _. .. _ . __ <br />