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grit hhP f hbl~, Cbrn, Sss <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1373 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />(/~~e.A,~ vs,~ u~ o c S <br />COLORADO <br />DIVISION O F <br />MINERALS <br />GEOLOGY <br />RECLANATION•MINING <br />SA FETY•SCIENCE <br />Bill Owens <br />Governor <br />Date' July 22, 2005 Russell Ceorge <br />Executive Director <br />TO: RllSS Means Ronald W. Cottony <br />S/~/ '~/ Division Director <br />From: / Harry POSC~~~7Z I / /~ Natural Resource Trustee <br />~/ <br />Re: SPLP results review: Cotter Corpora ' n, JD-6 (M-1977-319), JD- 8 (1984-014) and JD-9 <br />(M-1977- 6) 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 from waste rock exceed certain applicable <br />water quality parameters. <br />Table 1. Comparison of SPLP results with ground or surface water standards. <br />Analvte SPLP Results Standard Comments & dilution required to meet standard <br /> (ug h-) (ugh) <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 standard @ hardness of 25. <br /> available 46x dilution needed. <br />Selenium 61 None 4.6 Chronic aquatic life standard. <br /> available Agricultural standard = 20 ug/L 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 />Once of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />