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<br />STATE OF f ~e~e S~ <br />COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />t 3t 3 Sherman st., Room 2 i s ~ :' C O L D RA D O <br />Denver, Colorado 80203 <br />Phone: (30318663567 ~-:; D I V I S I O N O f <br />1vt 1 N a RA L $ <br />pnx: (3031 a32-etas G E O L O G Y <br /> •~~'~~ ~ <br /> <br />ti <br />{ 0.EC lAMAT1ON•NINING <br />EAiETY•SCIENCE <br /> y <br />~O <br />R <br />ti ~~ <br />q' <br />' <br /> ~ <br />_, ,~~ ~ ~ ~. sill Owens <br />Date: July 22, 2005 ~`' r` ~'" <br />~ e~Yem« <br /> <br />aL <br />-_ <br />' <br />- ' ~' Russell OErorBe <br /> ~ <br />~ Executive Dlrenor <br />TO: Ru$s Means ~ Ronald W. Canany <br /> <br />From: Harry Pose ~~ Division Director <br />Natural Resource 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 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 7D-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. Com arison of SPLP results with ound or surface water standards. <br />Anal e 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 standard. <br /> available Agricultural standazd = 20 ug/L for 30 day period. <br /> 14x dilution needed for surface water. <br />Arsenic Z 10 None 50 Drinking water standard <br /> available Sx dilution needed. <br />