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<br />STATE OF 4 ~e~e S~ <br />COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman SL, Room 215 C. <br />~ C O L D RA D O <br />Denver, Colorado 80203 _` <br />. ~., <br />~ D 1 V 1 5 1 0 N O F <br />I\'t l N <br />A L $ <br />Phone: (303) 866-3567 `~ <br />'~ & <br />FAX: (303) 832$106 :! <br />: G E O L O G Y <br /> ~• ~~~ ~ <br />°• <br />~ 0.ECLAMATION•NININO <br /> <br />sAf ETY•SUENCE <br /> ~ <br />~ ~ <br />' <br /> i <br />yv + <br />~_..~~ <br /> <br />Bill Owens <br />Date: July 22, 2005 <br />` <br />~ Governor <br /> s. <br />> ~ <br />- <br />'~ ' <br />' Russell George <br /> ~ <br />~ <br />~ ExecNive DlreCTOr <br />TO: Russ Means Ronald w.Iattany <br /> <br /> <br />From: Harry Pose Division Director <br />Natural Resource Trustee <br /> <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 samp]es 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 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 />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 standazds. <br />Analvte SPLP Results Standazd 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 standard <br /> available Sx dilution needed. <br />