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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 C O L O RA D O <br />Denver, Colorado 80203 D 1 V I S I G N O F <br />Phone: (303) 866-3567 MIN 6 RA L S <br />Enx: (303) s3z-filo6 G E O L O G Y <br /> 1lEC LANATION•NININO <br /> SAFETY•SCIENCE <br /> Bill Owens <br />Date: July 22, 2005 cwemRr <br /> Russell George <br /> Executive Director <br />To: Russ Means Ronald W. Cattany <br /> <br />F <br />H <br />P Division Director <br />Natural Resource Trustee <br />rom: <br />arry <br />ose <br />Re: SPLP results review: Cotter 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 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 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 }righer 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. Com arison of SPLP results with ound or surface water standards. <br />Analyte SPLP Results Standazd Comments & dilution required to meet standard <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 standazd @ hazdness of 25. <br /> available 46x dilution needed. <br />Selenium 61 None 4.6 Chronic aquatic life standazd. <br /> available Agricultural standazd = 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 />r ~..d R~6mvinn Artiva and Inwriiva Minac GFnloeical Su <br />