2003-03-24_REVISION - M1978268 (2)

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MINING PLAN JANUARY, 2003 OURAY COUNTY ROAD 8 BRIDGE DEPT P. O. Box 468, Ridgway, CO 87132.0166 PHONE 970628.6391 -FAX: 626439 EXNISIT D Rules 8 Regs 6.4.4 °DALLAS 6RAYEL° PCIw1T N' M 1978-268 SCC 3, T44N, RBW, NMPM, OuRAY County, CO AYlNOMlNT APPLICATION - RCO 772 OPCR CONBT MATR METHODS acra.a lap Initial relocation of the current northeast topsoil stockpile shall be accomplished by end-dump trucks loaded by front-loaders or by wheeled earthmover scrapers. Topsoil spreading back onto the finished slopebanks and pit floor azeas shall be accomplished by similar hauling, with spreading of the topsoil downslope by bulldozer. Extraction of gravel resource deposits shall be by pushing down raw material piles with a tracked bulldozer working downslope. Wheeled front-loaders pick up the materials from the push-piles for loading the processing equipment. Depth of extraction of raw material shall be to the previously-approved 2:1 finish-design slope face, beginning with several feet deep at the top and progressing to about 166 feet of vertical depth at the toe of the final finished slope. Headwall sideslopes of two-horizontal to one-vertical (2:1), which was previously approved for the current toning & Reclamation Plans, shall be maintained from the excavation boundaries to the finished pit floor during excavation. Crushing and screening processing operations shall occur initially on the current (temporary) pit floor just west of the Stage 1 area. Products shall be stockpiled on-site in partialy or wholly worked-out flat portions of the extraction areas. Pre-mining stripping and stockpiling of surface soils and vegetation shall be by bulldozer and frontloader combination. Extraction of the 8%racre (initial) Stage Z area shall progress at the full 195- to 250-foot width from the top of the currently disturbed slope (ENE edge) and proceed down the fall-line to the elevation of the current pit floor (approx. elev. 7,380) in what will become the new "Stage 4", final extraction area. Processing of raw gravel resources shall include a combination of crushing and screening operations. Stockpiles of produced gravel aggregate material shall be located in the same (temporary) pit bottom, where it can be loaded for truck & trailer transport to nearby area market applications. In Stage 4 half of this pit floor shall be utilized at a time for processing & stockpiling while the other half is mined at successive 20-foot depths at a time, for the remaining 100-foot depth of available material in the temporary pit floor. Products shall be truck-hauled from the site to Ouray County road construction site applications. EARTHMOVING -MINING aca,~-leg Topsoil was previously stripped from Stage 1 areas and was stockpiled with wasted clayey soils from the extraction areas in two current stockpiles, to be later used for reclamation topsoiling. The current stockpile located in the north half of the Stage 1 area must be first relocated to the current pit floor in the futrure Stage 4 area, or buried in over-excavated areas of Stage 1 area, before mining may resume under this proposed permit amendment. Extracted gravel resources are then to be bulldozed downslope to the existing temporary pit floor for processing. The relocated forest access road shall be incorporated into this first excavation at the top (east-northeast) edge of Stage 1 area (just below a small portion of completed, revegetated slope) from the existing loop access road at the north edge through to the southeast corner of Stage 1 area. A grade of shallower than + 8% shall be maintained for the forest access road beginning at elevation 7497 M.S.L. and temporarily ending at an elevation of approximately 7530 feet M.S.L. Stages 2 & 3 shall extend this road east to its juncture with the existing road at the permitted area southwest corner. The grade for that final reach of the road shall be approximately level at 7,530 feet elevation. Twelve-foot wide stor7nwater runoff control benches shall be incorporated into the downslope-proceeding excavations of all of the four stages, one at an elevation of approximately 7,450 feet M.S.L., and another at File: ElOurdyCOlDallasGrav11f2AmmdAppl ~ 14 071L7N3