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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />- Department of Natural Resourtxs <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 8663567 <br />FAX: (303) 832.8106 <br />Date: June 15, 2005 <br />To: Steve Shuey / <br />Russ Means <br />~~P~ <br />RADO <br />O N O F <br />RALS <br />EOLOGY <br />LAMATION•MINING <br />enl OWel15 <br />Govertwr <br />Russell Geolge <br />Executive Director <br />Ronald W. Canany <br />Division Director <br />Nlahml P......... T....rr <br />From: '~Hatry Posey ,e~~ " " " / <br />Re: V SPLP results review: Cotter Core/ 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 sepazately at the Division on <br />May 16 and May 23, 2005. <br />The analytical results and conclusions of this memo should apply to similar ore and waste rock piles in <br />the near vici Dity provided they aze mined from the same geologic units and that they have a similaz <br />mineralogy. I would anticipate similaz results for other ore and waste rock in the Uravan district <br />generally, including mines in San Miguel county or southward. <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 ground or surface water standards. <br />Anal e 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 standard. <br /> 8x dilution needed. <br />Lead na 7.3 0.5 Chronic aquatic life standazd @ hardness of 25. <br /> 15x dilution needed. <br />Selenium 86 230 4.6 Chronic aquatic life standazd. <br /> Agricultural standard = 20 ug/L for 30 day period. <br /> 19x dilution needed for surface water. <br /> 50x dilution needed for oundwater. <br />Uranium na 2700 326 Chronic aquatic life standard @ hardness cf 25. <br /> 9x dilution needed. <br />Zinc na 190 36 Chronic aquatic life standard @ hazdness of 25. <br /> 6x dilution needed. <br />ice of Office of Colorado <br />Mined Land Reclamation Attive and Inactive Mines Geological Survey <br />