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J. E. STOVER & ASSOCIATES, INC. <br />P.O. BOX 60340 <br />GRAND JUNCTION, COLORADO 81506 <br />PHONE: (970) 245-4101, FAX 242-7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />June 27, 2005 <br />Jim Stark <br />Division of Minerals & Geology <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Minrec, Inc., North Thompson Creek Mines <br />NOV CV-2005-007 <br />~- ~Permif Noo-C=8~-025- -- - -- <br />Dear Mr. Stark: <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />FiECEIVEQ <br />JUN 3 0 2005 <br />Uivisiort •f Minerals and Ceoiogy <br />On behalf of Minrec, Inc., I offer the following discussion relative to the referenced notice of <br />violation. <br />Aeration Ditch <br />The aeration ditch which is one half of a 12 inch diameter pipe has a capacity of about 160 <br />gallons per minute with freeboard. The typical flow rates seen by the aeration ditch are less <br />than 30 gallons per minute. The alignment of the pipe sections can be affected by wildlife <br />and domestic stock which can reduce the capacity of the ditch. The ditch can also become <br />partially filled with moss and grass. <br />As a result of recent problems with the aeration ditch, Minrec proposes to construct a berm <br />along the south site of the aeration ditch. The berm will direct any flow that escapes the <br />aeration ditch to the long pond. The berm will be at least one foot high. <br />Pond T-2 Emergency Sgillway <br />Drawing D-2-5 shows an open channel between treatment pond T-2 and pond P-9. Minrec <br />proposes to construct the open channel between treatment pond T-2 and pond P-9 to <br />function as the emergency spillway for pond T-2. Pond P-9 is approved as a treatment pond <br />so having mine water directed to pond P-9 should not be a problem. The four inch diameter <br />emergency spillway(s) from pond T-2 will be abandoned. <br />Please call with any questions. <br />Sincerely, <br />~Lc <br />"J. E. Stover, P.E. <br />Consulting Engineer <br />Cc: Minrec, Inc. <br />