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f ~eti`e Slr~ <br />STATE OF COLORADO <br />DIVlSlON OF MINERALS AND GEOLOGY <br />Department of Nature) Resources <br />1313 Sherman SL, Room 215 ± ~' C ~ I. ~ RA D C' <br />Denver, Colorado 80203 i' % D 1 V t 5 1 0 N O F <br />M 1 N <br />'~ L $ <br />Phone: (303) 8663567 & <br />FAX: (3031 83T-8706 G); ~ L ~ G Y <br /> '~~ ~. ~ <br />-. ~~~ <br />~ AECUMATION•RINrNd <br />SAfETY•SCIENCF <br /> 4' ~Y <br />~. <br /> f@ ~ 0111 DMIenS <br />2005 <br />Date: 7uiy 22 . <br />~ F-' <br />, ^,.; Russell Geaege <br /> ~: ~ , s ` "'ti Executive Director <br />TO: Russ Means Ronald W. Canany <br /> <br />From: Harry Pose}~~~~ ~~ Div,sion Difoctar <br />Natural Resowce rnnree <br /> <br />Re: SPLP results review: Co tter Corpora ' n, JD-6 (M-1977-319), JD- 8 (1984-014) and JD-9 <br />(M-19?7-306) Mines <br />Background: This memo assesses the results of SPLP tests on waste rock samples that are purported by <br />Cotter to be representative of the above captioned operations. The results were presented in Cotter's letter <br />received by the Division on June 28, 2005. Provided these samples are truly representative, then as DMG <br />staff and Cotter agreed, the tests results maybe applied to waste rock at the JD-6, JD-8 and JD-9 as the <br />company has represented that the mines are geographically close and mining will occur within the same <br />geological formations. We understand that SPLP test results for ore samples will be forthcoming. The <br />following discussion and Table 1 provides guidelines for the company to consider in evaluating to what <br />extent any release of contaminants from these facilities might affect water quality. If higher SPLP results <br />appear from the ore samples, Cotter should consider those separately. <br />SPLP Results for JD Mines: The following SPLP results Crom waste rock exceed certain applicable <br />water quality parameters. <br />Table i. Com arison of SPLP results with ound or surface water standazds. <br />Analvte SPLP Results Standazd Comments & dilution required to meet standazd <br /> u {uglL} <br /> Waste Ore <br /> Rock <br />Aluminum 480 None 87 Chronic aquatic life standard. <br /> available 6x dilution needed. <br />Lead 23 None 0.5 Chronic aquatic life standazd @ hardness of 25. <br /> available 46x dilution needed. <br />Selenium 61 None 4.6 Chronic aquatic life standard. <br /> available Agricultural standard = 20 ugfL for 30 day period. <br /> 14x dilution needed for surface water. <br />Arsenic 210 None 50 Drinking water standard <br /> available Sx dilution needed. <br />