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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 />MINE ENGINEERING <br />MINE RECLAMATION <br />May 1, 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; Supplemental Information <br />Permit No. C- 1981 -025 <br />Dear Mr. Bowles: <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />'eo,e\ Q <br />Vk <br />r b l0 <br />of ?,e ga eayor, <br />During a recent DRMS inspection it was noted that drawing D -2 -5 required a few updates. <br />On behalf of Minrec, Inc., the following modifications were made to the drawing. <br />1. The inlet to the long pond was changed to an open channel. The open channel was <br />designed to handle a 70 gpm flow. Flow calculations for the open are presented on <br />new page P -9 -11. A new section E -E was added to the drawing. <br />2. The 4" diameter emergency spillway for pond T -2 was shortened to match field <br />conditions. <br />3. A six inch diameter pipe was added to the outlet of pond T -2. This pipe conveys flow <br />from pond T -2 to the open channel that flows to Pond 9. <br />4. Some text under pipe notes was revised. <br />Enclosed are new design page P -9 -11 and drawing D -2 -5. <br />Sincerely, <br />r <br />J. E. Stover, P.E. <br />Consulting Engineer <br />