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Sheeti <br />saNGRE DE CRISTO (SQC) LAeORATORY, INC. <br />Tierra Del Sol Industrial Perk <br />2329 Lava Lane - P.O. Box 642 <br />Alamosa, CO 81101 <br />FAXOGRAM <br />TO: eatde Mountain Gold Mine -Attention: Ms. Salty keyes <br />FROM: Evelyn Vigil, Chemist <br />Subject: ERA Performance Evaluation Results -lot # 0813-96-02 (Preserved wHh NaOH) <br />Sally, I am faxing our results to the ERA performance evaluation sample that was received hDrrt ERA <br />on 8/20!96. We ren it three separate times (in a two day period) againat an EPA quality conk~ol cyanide <br />sample. Following are the results. <br />SDC Lab's Results of <br />Internal Quality Control <br />Date Analyzed Sample (mg/L) <br />8122/96 0.230 <br />8122198 0.223 <br />8/23!96 0,200 <br />Average: 0.218 <br />RSD: 7.21% <br />Results of ERA's <br />External Quality Control <br />Sample (mglL) <br />0.169 <br />0.156 <br />0.155 <br />0.18 <br />4.88% <br />Note: 95°k Confidence Intefval Range of Internal Q.C. = 0.129 - 0.347 <br />Please call me at your earliest convenience. Thanks Salty! <br />Ta 3ntid <br />gas <br />Page t <br />L69E68S6TCi BL~Si 966il6L/BB <br />