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MINE ENGINEERING CIVIL ENGINEERING <br />MINE RECLAMATION CONST. MANAGEMENT <br />March 5, 2013 <br />Brock Bowles <br />Division of Reclamation Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Minrec Inc., North Thompson Creek Mines <br />Permit Renewal 6 Adequacy Response <br />Permit No. C- 1981 -025 <br />Dear Mr. Bowles: <br />J. E. STOVER & ASSOCIATES, INC. <br />2352 NORTH 7th STREET, UNIT B <br />GRAND JUNCTION, COLORADO 81501 <br />PHONE: (970) 245 -4101, FAX 242 -7908 <br />RECEIVED <br />MAR 082013 <br />Division of Reclamation, <br />Mining & Safety <br />The DRMS' letter dated February 15, 2015 transmitted its adequacy review for the <br />referenced permit renewal. On behalf of Minrec, Inc., following are its responses to the <br />DRMS' comments and concerns. <br />1. DRMS - The permittee is authorized to discharge under the current NPDES permit <br />from outfall 001A (Appendix 4 -G, expiration January 31, 2015). Outfall 001A is also <br />the monitoring location for the effluent limitations specified in Part I -A -2, page 3 of 19 <br />of the NPDES permit. During site inspections conducted in June 2011, October 2011 <br />and December 2012, Division inspectors noted water discharging through outfall <br />001A. The discharge monitoring reports (DMR) of the same months indicates there <br />was no discharge from the North Thompson Creek Mine. Please discuss why the <br />discharges were not reported in the DMRs. <br />NTC - During the period discussed above, the Operator contained all water flowing <br />through outfall 001A in pond 9 or the refuse pond. The Operator does not believe <br />that water contained on site is discharged. Therefore, no discharge was reported on <br />the DMRs. <br />2. DRMS - On maps D -2 -5 and D -3 -2, a "Landowner Installed Pipeline" originates near <br />Pond T -2 and runs east across the refuse area. The pipeline continues beyond the <br />permit and map boundaries. Please clarify the purpose of this pipeline. <br />NTC - The pipeline is used to convey water from treatment pond T -2 to a stock <br />watering tank. The DRMS approved the installation of the pipeline through its <br />approval of minor revision number nine (MR -09) on June 1, 1990. The tank is <br />located at latitude 39.325, longitude 107.296. A brief discussion of the pipeline was <br />added to page 4 -ii. <br />