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MINING PLAN REVISIONS <br />1. General Mining Plan Revisions <br />Currently this pit is permitted to mine 115 acres along the north fork of the Gunnison River. <br />Excavation was divided into five phases. Phase 1 lies on the northwest side of the permit, and is <br />separated from the other four phases by a 200 foot buffer. Phase 2 is immediately south of the <br />200 foot buffer and west of Phase 5. Phase 3 & 4 are on the northeastern end of the property. For <br />the purposes of this technical revision, the phases have been relocated. Phase 1 and 2 remain in <br />there original location, with phase 3 being the old phase 4 plus th ection of the 200' buffer <br />being removed, and phase 4 being to the ultimate northeast o permit boundary. Most of what <br />was phase 5, which are wetlands, will be left undisturbed. a new phase boundaries can be seen <br />on Map C-2. <br />As part of this technical revision, Tri County will . e out a secti ea Jthe 00 foot riparian <br />buffer between Phases 1 & 2. An area of 8.0 a es will be moved It of this excavation. <br />In the original DRMS permit, the 200 foot er was set as' a ildlife habitat. In order to <br />encourage post-mining development of s, ch habitats, a 8. res of wetlands in the old Phase 5 <br />area will be left undisturbed. The ope for comm' s t s lying irrigation water to the wetlands <br />within the old phase 5 area in orde t' maint . uring mining. <br />Currently, the Tri County pit itte to mine all slopes to 3H: 1V. s art of the technical <br />revision, all pit slopes wil e, mined t mal slope of 2H:1 V anzelake 1 be reclaimed tl a slope of <br />3H:1 V down to 10 feet low water Iin and then 2H:1 to bottom \, <br />c ? <br />' I <br />The Tri County p' will ch a from a wet pit w' miing is hack hoe, to a e atered pit with <br />mining via loa and trucks. A it pump w be ' talled in the weste ri r of phase 1, and <br />will pump to sediment pond near the topsoil le ove the it, ' at y to the southwest. <br />As seen o p C-3, the sediment pond will theli discharge int a orth fork of the Gunnison <br />River. NPDES discharge permit will be acquired f r this o e ation. Since the existing <br />groun ater level is so close to bedrock, the pit pum wll n always be below the mining level. <br />Tri County Technical Revision Sept 07 3