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MINING PLAN EXHIBIT D <br /> 1. General Mining Plan <br /> The total permit area will be 338.8 acres. The purpose of this mine is to produce construction <br /> materials products (aggregates, concrete, asphalt, etc.) from the quarried basalt found onsite. <br /> When mining and reclamation is complete, a water storage facility and surrounding rangeland <br /> will be what remains. The total expected mine life is 50+years, with roughly 20 years of that <br /> remaining. The purpose of the mining activity is to provide crushed rock, road base, asphalt, and <br /> related products for construction along 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. Map C-2 shows the mining extents. <br /> The amended permit boundary of January 2019 will encompass 338.8 acres containing all of the <br /> Asphalt Paving Co. operations. The permit area is marked on site. Map C-2 shows the <br /> configuration of the fully mined out quarry along with stormwater drainage patterns and the <br /> location of processing equipment and stockpile areas. The basalt is blasted in place into a series <br /> of slopes and benches on the western side of the mining area. One continuous slope will be <br /> established on the east side. Material is hauled from mining faces to the processing area via haul <br /> truck. Finished product that is made in the processing area is sold and transferred off site. <br /> Ralston Quarry produces crushed rock, road base, and asphalt. <br /> Access to the mining area is 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 fine material and varying sizes of loose basalt. This material is stripped and <br /> screened by Asphalt Paving Co. (APC)to sell the basalt, and the remaining non-basalt material <br /> will be used as topsoil and fill. This process will generate approximately 50,000 CY of fill <br /> material a year. This fill material is stored in stockpiles along the quarry edge and future mining <br /> areas in the southeast corner of the permit. <br /> Ralston Quarry GM Izwitki and Aswciatm PIA U <br /> January 2019 D-1 <br />