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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmen[ of Natural Resources <br />1313 Sherman St., Room 215 C O L O RA D O <br />Denver, COlOrado 80203 DIVISION O F <br />rhone: c3D3) etf;3se~ , MINERAL S <br />FAx:1303) a333fd~spn12006 <br /> G E O L O G Y <br /> <br />Jim Stover EEGLANATION•NININO <br />EAEETT•ECIENCE <br />J. E. Stover & Assoc. <br /> eiil owem <br />P.O. Box 60340 covemor <br />Grand Junction CO 81506 Russell Geo~ <br /> Executive Director <br />RE: North Thompson Creek Mine (C-1981-025); 2005 Annual Hydrology Re~ <br />~ o <br /> 61 <br />f <br /> Natural Resource Truuee <br />Deaz Mr. Stover: <br />The Division has received and reviewed the 2005 annual hydrology report for the North <br />Thompson Creek mines. Regarding the predictions in the "probable hydrologic <br />consequences" section of the permit application package, most of the original points in <br />the PHC no longer apply. Of the remaining predictions, the following two relate to mine <br />dischazge. <br />(1) Discharge from point 001- the long remaining discharge point -may slightly impact <br />the water quality ofNorth Thompson Creek. <br />This prediction is accurate. Concentrations in total dissolved solids (TDS) and most <br />other analytes in the creek downstream from the discharge point were slightly greater <br />than those in the upstream sampling. <br />(2) Discharge will be below the limit of I ton/day of salts added to the Colorado River <br />system. <br />This prediction is accurate. Total salt averaged considerably less than 1 ton/day with an <br />average discharge of 14.9 gpm of water containing 1321 mg/1 total dissolved solids. The <br />totals were 238 pounds per day of salt added to the system. <br />Total iron dischazged has been very low - 0.02 to 0.03 mg/1-for several consecutive <br />years. <br />Thank you for the prompt submittal. <br />Sincerely, <br />Jim Btunell <br />Environmental Protection Specialist <br />Office of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />