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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Departrnent of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) Bb6-35b7 <br />FAX: (303) 832$106 <br />COLORADO <br />D I V 1 5 1 0 N O F <br />MIPISRALS <br />GEOLOGY <br />0.EC LANATION•NINING <br />SAEE TY•EQENCE <br /> Bill Owens <br />Date: July 22, 2005 cGVemor <br />Russell George <br /> Execlrtive Director <br />TO: Russ Means Rnnald W. Canany <br /> <br />From: 'jj~'f~j/~~'~~/ <br />Harty POSe}Z / Division Direttor <br />Natural Rewurce Trustee <br />Re: SPLP results review: Co tter Corpora ' n, JD-6 (M-1977-319), JD- 8 (1984-014) and JD-9 <br /> (M-1977-306} 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 aze 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 aze 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 />appeaz 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 pazameters. <br />Table 1. Comparison of SPLP results with ground or surface water standazds. <br />Anal e SPLP Results standazd Comments & dilution required to meet standazd <br /> <br /> u (ug/L) <br /> Waste Ore <br /> Rock <br />Aluminum 480 None 87 Chronic aquatic life standazd. <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 standazd. <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 standazd <br /> available Sx dilution needed. <br />Office of <br />Land Recl+ <br />Office of <br />Active and InaRive Mines <br />