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'. Summary History of the Review Process On August 15, 1483, the North Thompson Creek Mines were issued a permanent program permit, Permit No. C-81-025, for a five-year term. The Division renewed this permit on August 26, 1988, for a second five-year term. On November 12, 1992, the Division notified MINREC that a permit renewal application for a third term must be submitted 180 days preceding expiration of the permit. MINREC, Inc. submitted an application for the renewal of the North Thompson Creek Mines on February 16, 1993. Public notice of the application for permit renewal was published in the Glenwood Post once each week for four weeks, beginning on March 11, 1993. No comments concerning this renewal were received by the Division. The preliminary adequacy review letter, in which the Division identified deficiencies in the original renewal application, was sent to the applicant on May 25, 1993. Resolution of the deficiencies was required in order for the Division to make determinations of compliance with the Act. The applicant responded to the comments on June 10, 1993. Previous analyses of the North Thompson Creek mining and reclamation operation have included the original permitting review, mid-term reviews, and minor and technical revision applications. The reader is directed to File No. C-81-025 for further specifics of these reviews. Description of the Environment The North Thompson Creek Mines and Loadout are located in the lower Roaring Fork Drainage Basin. The loadout is located about a mile below the confluence of the Roaring Fork and Crystal Rivers. The major drainages, divides and basins of the mine area are shown on Drawing D-4-7 of the permit application. The permit area of the North Thompson Creek Mines is located within the North and Middle Thompson Creek Drainage Basins. These two perennial streams combine to form Thompson Creek about two and one half miles below the mining facilities. Thompson Creek is a major tributary of the Crystal River, which is located about five miles downstream of the mining disturbance. The stream valleys of North and Middle Thompson Creeks have steep stream gradients and have steep valley walls. Elevations within the Thompson Creek drainage basin range from 10,927 feet at Twin Peaks, to 7,700 feet at the mine, down to 6,375 feet at the confluence with the Crystal River. Geology The North Thompson Creek Mines and the loadout areas are located along the Grand Hogback monocline. The Grand Hogback forms the steeply dipping eastern edge of the Piceance Basin. The Pennsylvanian through Tertiary Age sedimentary formations which for the Grand Hogback dip 15 to AS degrees to the west. -2-