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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Departrnent of Natural Resourvces <br />1313 Sherman SL, Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832.8106 <br />Date: June 15, 2005 <br />To: Steve Shuey <br />Russ Means <br />COLORADO <br />DIVISION O F <br />MINERALS <br />GEOLOGY <br />RECIANATION•NINING <br />f AEETTECIFNCF <br />Bill Owens <br />Governor <br />Russell George <br />Executive Director <br />Ronald W. canary <br />Division Director <br />N~n~.~l o.......... T...e.r <br />From: Harry 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 sepazately 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 mck piles in <br />the near vicinity provided they aze mined from the same geologic units and that they have a similaz <br />mmer~gy-I won an cipa a smu ar resul orts f ofher ore and waste me m e ravan 1stn <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. Corn arison of SPLP results with ound or surface water standards. <br />Analvte SPLP Results Standard Comments & dilution required to meet standazd <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 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 standard @ haztiness of 25. <br /> 9x dilution needed. <br />Zinc na 190 36 Chronic aquatic life standard @ hardness of 25. <br /> 6x dilution needed. <br />Office of Office of - Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />