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MINING PLAN <br />1. General Mining Plan <br />EXHIBIT D <br />The original application, and this amendment, proposes surface mining basalt for the production <br />of construction materials. This amendment proposes to change the post mine land use of the site <br />to a water storage reservoir. The total permit area will remain 271.61 acres. The total expected <br />mine life is 50+ years, with roughly 20 years of that remaining. The purpose of the mining <br />activity is to provide crushed rock, road base, asphalt, and related products for construction along <br />the Front Range. <br />The basalt dike that is being mined at the Ralston Quarry extends down at least 500 feet from the <br />original peak of the ridge (6500' elevation). Mining will continue to a final floor elevation of <br />6000'. The basalt likely continues deeper. The deposit is constrained by the shale contact along <br />the ridge line on the west side, and then extends out past the property line to the east. Mining will <br />be constrained by the shale contact and the property lines. <br />The amended permit boundary will encompass 271.61 acres containing all of the Asphalt Paving <br />Co. operations. The permit area is marked on site. Map C -3 shows the configuration of the fully <br />mined out quarry along with stormwater drainage patterns and the location of processing <br />equipment and stockpiles. The basalt is blasted in place into a series of slopes and benches on the <br />western side of the mining area. One continuous slope will be established on the east side. <br />Material is hauled from mining faces to the processing area via haul truck. Finished product that <br />is made in the processing area in the southwest of the permit area is sold and transferred off site. <br />Ralston Quarry produces crushed rock, road base, and asphalt. <br />Access to the mining area will be from the existing road connecting to Highway 93. <br />Traditional topsoil is not present on the site. The upper 2 -10 feet of material on undisturbed areas <br />contains a mixture of topsoil material and varying sizes of loose basalt. This material is stripped <br />and screened by Asphalt Paving Co. to sell the basalt, and the remaining non - basalt material will <br />be used as topsoil and fill. This process will generate approximately 50,000 CY of fill material a <br />year. This fill material is stored in stockpiles along the quarry edge and future mining areas in the <br />southeast corner of the permit. <br />Ralston Quarry, February 2015 D -1 <br />