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MINREC, INC. 2768 COMPASS DRIVE, SUITE 101 GRAND JUNCTION, COLORADO 81506 PHONE: (303) 245-4101, FAX 242-7908 NORTH THOMPSON CREEK MINES August 14, 1995 Barbara L. Pavlik Division of Minerals & Geology 1313 Sherman St., Room 215 Denver, CO 80203 Re: Minor Revision Application Revise Pond Spillways Permit C-81-025 Dear Ms. Pavlik: RECEIVED AUG 17 1995 III II IIIII I IIIIIIII Division of Minerals & Geolo9Y The No. 3 Mine, (Outfall 007), has two separate sources of discharge. One is from a point source (spring) within the Mine that is piped directly to the surface. This good quality point source of water has been the source of the discharge from the No. 3 Mine, (Outfall 007) , since the mine was sealed in 1986. The water level in the mine has fluctuated since that time but no water has discharged directly from the mine in ten (10) years. During the second quarter, the very wet spring weather evidently caused the mine to fill and begin discharging iron laden water. The discharge was first discovered on Monday, June 26, 1995 at about 9:45 a.m. Approximately 67.5 gpm was flowing from the mine. The discharge was inspected on Wednesday and Friday of the same week and the flow was decreasing quite rapidly. In order to handle the non-compliance discharge, Minrec combined the discharge from the No. 3 Mine, (Outfall 007), with the discharge from the No. 1 Mine, (Outfall 001), as provided for in its discharge permit. A 4" diameter pipe has been installed to convey the discharge from Outfall 007 to the long pond. The spillway systems for the ponds were revised in order to provide for the increased flow through the treatment pond system. All three ponds originally had a four inch diameter primary spillway and a four inch diameter emergency spillway. A six inch diameter primary spillway was installed in the long pond and treatment pond T-2. The emergency spillways for both of these ponds will be the existing four inch diameter emergency spillway and the four inch diameter primary spillway which was converted to an emergency spillway. Therefore the long pond and treatment pond T-2 will each have a six inch diameter primary spillway and two four inch diameter pipes to serve as emergency spillways.