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• MINREC, INC., NORTH THOMPSON CREEK MINES <br />2000 ANNUAL HYDROLOGIC REPORT <br />INTRODUCTION <br />The Operator completed reclamation of the North Thompson Creek Mines during 1987. <br />The No.1 Mine was sealed during 1987 with the expectation that no water would discharge <br />from it again. The No. 3 Mine was sealed, however pipes were placed in the lowest seal <br />to allow water to drain from the mine. <br />During 1988, the No 1. Mine filled with water and started to discharge. The portal area was <br />excavated in order to control this seepage. One of the portals and a flooded air shaft were <br />exposed to control the mine seepage. Access to the portal was restricted by locked <br />wooden doors. A four foot thick concrete seal, which "dams" the seepage, is located <br />approximately fifty feet back from the doors. Two three inch valved pipes penetrate the <br />seal. <br />The flooded air shaft was also a source of mine seepage water. There is a concrete plug <br />in the shaft which water flows through or around. From 1988 until about 1995 only about <br />15 gpm would flow around or through this concrete plug. Beginning in 1995 the integrity <br />of the plug degraded and the flow rate from the shaft began to increase. <br />• As of June 1998, all of the seepage water from the No. 1 Mine emerges from the shaft. <br />No water is impounded behind the portal seals. The water from the shaft is conveyed to <br />the long pond through a 6-inch PVC pipe. During late 1998, the Operator backfilled the <br />portal area. A 36-inch culvert was installed in the fill to provide access to the air shaft and <br />the inlet of the 6-inch PVC pipe. <br />Current monitoring requirements are shown on pages 3-61 and 3-86 of the permit. <br />Monitoring locations are presented in Volume V of the permit on Map D-4-23. <br />Monitoring data for this years report is segregated into the following appendices: <br />Appendix No. Monitoring Data <br />North Thompson Creek -Upstream & Downstream Water Quality <br />Refuse Pile Piezometers, D-1 A & D-2A <br />Water Level, pH, Conductivity & Graphs <br />III Mine Water Level - No. 3 Mine <br />IV Mine Discharge Quality - No. 1 Mine & No. 3 Mine <br />• <br />