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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depamnent of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 8643567 <br />FAX: (303) 832.811Ns <br />Date: June 15, 2005 <br />To: Steve Shuey <br />Russ Means <br />COLORADO <br />DIVISION O F <br />MINERALS <br />GEOLOGY <br />EECIAMATION•MINING <br />SAfETT•SCIENCE <br />Bill Owens <br />Governor <br />Russell Geolge <br />Executive Director <br />Ronald W. canary <br />Division DlrelYOr <br />N.w.'.I o-._....- r.....__ <br />From: Hang Posey <br />Re: SPLP results review: Cotter Corp ation, SM-18 (Wright) Mine; M-1978-116 <br />Background: This memo assesses the results of SPLP tests on waste rock and ore samples from the <br />above captioned operation. These were presented in Cotter's letters received separately at the Division on <br />May 16 and May 23, 2005. <br />The analytical results and conclusions of this memo should apply to similaz ore and waste rock piles in <br />the near vicinity provided they are mined from the same geologic units and that they have a similaz <br />generally, including mines in San Miguel county or southwazd. <br />SPLP Results for SM-18 Mine: The following SPLP results exceed certain applicable water quality <br />pazameters. <br />Table 1. Comparison of SPLP results with Around or surface water standazds. <br />Anal a SPLP Results Standard Comments & dilution required to meet standard <br /> <br /> u <br /> Waste Ore <br /> Rock <br />Aluminum 636 140 87 Chronic aquatic life standazd. <br /> 8x dilution needed. <br />Lead na 7.3 0.5 Chronic aquatic life standazd @ hazdness of 25. <br /> 15x dilution needed. <br />Selenium 86 230 4.6 Chronic aquatic life standazd. <br /> Agricultural standazd = 20 ug/L for 30 day period. <br /> 19x dilution needed for surface water. <br /> SOx dilution needed for oundwater. <br />Uranium na 2700 326 Chronic aquatic life standazd @ hazdness of 25. <br /> 9x dilution needed. <br />Zinc na 190 36 Chronic aquatic life standazd @ hazr113ess of 25. <br /> 6x dilution needed. <br />OfOce of Office of Colorado <br />Mined Land Reclamation Active and InaQive Mines Geological Survey <br />