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DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 - 8106 <br />15 July 2011 <br />Office of <br />Mined Land Reclamation <br />Jim Stover, PE <br />Minrec, Inc. <br />2352 N 7th St, Ste B <br />Grand Junction, CO 81501 <br />RE: North Thompson Creek Mines (C- 1981 -025) <br />2010 Annual Hydrology Report (AHR) <br />Dear Mr. Stover: <br />STATE OF COLORADO <br />The Colorado Division of Reclamation, Mining and Safety (Division) has received a <br />copy of the 2010 Annual Hydrology Report (AHR) for Minrec, Inc's North Thompson <br />Creek Mines. The AHR was dated 2 February 2011 and received by the Division on 4 <br />February 2011. Thank you for your timely submittal of this report. <br />On 20 April 2006 Minrec was notified by the Colorado Department of Health, Water <br />Quality Control Division (WQCD) that the NPDES permit for the North Thompson <br />Creek Mines was given an inactive status as of 14 March 2005. At that point Minrec <br />discontinued all water monitoring at the site. On 9 April 2008 WQCD notified Minrec <br />that it would need to reapply for an NPDES permit for the North Thompson Creek Mines. <br />On 22 December 2009 the WQCD issued discharge permit CO- 048233, effective 1 <br />February 2010. <br />Minrec reinitiated water sampling at the North Thompson Creek Mines on 12 February <br />2010, as required. Water was discharged from outfall 001A (the outfall from Treatment <br />Pond T -2) to the North Thompson Creek. Discharges were monitored on 2 February <br />2010, 21 February 2010, 12 March 2010, 23 March 2010, 7 April 2010 and 14 April <br />2010. In May 2010 the discharge from Treatment Pond T -2 was rerouted to sediment <br />pond P -9 and the refuse pile pond. No water was discharged into the North Thompson <br />Creek from May 2010 through December 2010 (although Minrec did collect and analyze <br />samples from the T -2 discharge into the sediment ponds). <br />The following chart shows the average values for flow, pH, specific conductivity, total <br />dissolved solids (TDS) and iron for the 2010 samples and the averages for the sampling <br />years 2000 -2005, which were the last six years the discharge was sampled. The data <br />shows that the water quality for the 2010 samples is basically the same as the water <br />quality for the 2000 -2005 averages. <br />COLORADO <br />D I V I S I O N O F <br />RECLAMATION <br />MINING <br />— &— <br />SAFETY <br />John W. Hickenlooper <br />Govemor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />Office of <br />Denver • Grand Junction • Durango Active and Inactive Mines <br />