2008-04-01_REVISION - M1978143 - Laserfiche WebLink

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Exhibit D MINING PLAN Unless specifically discussed below the methods described in the August 1993 conversion amendment for the mining and reclama- tion plans will remain unchanged. There is no current bond because the mine is operated by an arm of Grand County Govern- ment. Anew reclamation cost estimate is presented in Exhibit L on page 13 of this application for your review. Existing slop- ing, grading and shaping plans will apply to the new area since they are similar to the area now in the permit. The following changes to the mining plan are numbered sequentially to give some order to this amendment. A GEOTECHNICAL STABILITY EXHIBIT is included to describe how mining next to the structures around the mine will be handled. AMENDMENT 1 - Acreage added to Permit This section describes the changes in area made to the permit. This amendment adds 11.60 acres to the permit area that adjoins the existing permit. It abuts the existing permit area on the east side so mining will continue from the existing mine floor across the property line into the new area. As noted in the existing mining plan the mine floor will remain gravel as the deposit extends deeper across the property then the final floor elevation shown on the maps. We have created three new maps that show the entire permit area. The have been placed on one plat to conserve space. The green outline is the new area and the yellow outline is the existing permit area. The Pre-Mining (Existing conditions) Map shows approximately how the site looks now. The Mining Plan Map showing how we feel, the site will look when mining progresses into the new area and the direction of mining. The Reclamation Plan Map shows how Grand County thinks the site will look when mining is complete. Note that the existing area looks like the maps currently on file, with the exception that the east slopes have been removed and the two areas are blended creating a larger floor area. Mining will begin on the new area once this amendment is approved, using the methods described in the 1993 conversion and this amended Mining Plan. All setbacks around the site in the new area will be 25 feet from the permit line to the dig line, except along the south side. In this area the mine floor will daylight out the hill side to the south on the western part and on the eastern portion a sloped berm will be left that hides the mine floor. According to the NRCS report in Exhibits I/J of the 1993 amendment, there is very little topsoil associated with the soils types found on the new area. Grand County has a supply of topsoil stored in the existing mine to resoil the slopes with at lease 4 inches. When topsoil or growth medium is encountered it will be stored on the setback areas or the mine floor for use in reclamation. If the stockpiles remain undisturbed for more that a year the piles will be, seeded with 3 pounds PLS of Crested Wheatgrass per 200 square feet to prevent erosion. The growth 3