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I <br />.U: al $dOJ 9.9J •9a_d dSCI t:~~0004'ER l(7JOO~;OOi <br />• • <br />A S C t <br />Adrion Smith <br />Canwlfiny Incorporated <br />2555 ~dgemonr 8aulevord <br />North Voncouwr, B.C. <br />Canada V7R 2M9 <br />Tdr.phonn 60~-9842524 <br />Fax: 604.98x8426 <br />MEMORANDUM <br />June 1, 1992 <br />T0: <br />FROM: <br />br Harry Posey, CMlRO, Denver, CO <br />Adrian Smith <br />ASCI, Vancouver, B.C. <br />RE: Calculation of maximum theoretical free cyanide levels: Soh Luis Proiect. CO <br />As requested, herewith the details of the calculations for maximum theorbtical free cyanide <br />levels in three of the four tailings samples taken from the San Luis Project tailings system on <br />May 11, 1992. The absence of reliable WAD CN data meant chat the frele cyanide level of <br />the fourth sample, (taken at the spigot), could not he computed. <br />For reference, I have appended a Copy of :he data summary table for tFle May 11, 1992, <br />tailings samples and a description of the general approach to calculating mass balances for <br />cyanide, from Smith and Mudder, 11991). <br />SAMPLE 1: Pre-Detoxification <br />The total Cyanide in this sample, using the manual TCN method, is 385 mq/L. The measured <br />WAD CN is 358 mg/1. Calculation of the metallo-cyanide complexes in the sample (i.e. <br />copper, nickel and tint!, which form part of the WAD CN are as follows: <br />copper (case A, as CufCNl2): <br />equivalent amount of cyanide required to form the Cu1CN12 Complex with the <br />copper is copper 1631 multiplied by cyanide 126) twice 152) which is 0.825 <br />i.e. 52/63 = 0.825. The copper value for sample 1 was 205/210 mg/L <br />which requires 208 X 0.825 = 172 mg/L cyanide. <br />Umaumalr <br />