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~rv>7,hh~J 1~bh~cbM, sss <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 C O L D RA D O <br />Denver, COlorado 80$03 DIVISION O F <br />Phone: (303) 8663567 MINERAL S <br />FAX: (303) 832-8106 ~G e^iQ-t"'~`~ ~~ S G E O L O G Y <br />0.EC LANATION•N INING <br />SAFETY•ECIENCE <br />Bill Owens <br />Date: July 22, 2005 ''~ cwemor <br />Russell George <br />Executive DI(e(!01 <br />To: Russ Means Ronald W. Cattany <br />/ Division Director <br />From: V Hairy POSe / / . // Natural Resource Trustee <br />V / v <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 aze 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 />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 parameters. <br />Table 1. Comparison of SPLP results with ground or surface water standazds. <br />Analyte SPLP Results Standard Comments & dilution required to meet standard <br /> u ) (ug/L) <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 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 Office of Colorado <br />Mined Cand Reclamation Active and Inactive Mines Geological Survey <br />