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EXHIBIT D MINING PLAN <br /> 1 . General Mining Plan <br /> The property boundary has been surveyed and marked. Map C-2 outlines the mining plan <br /> including the affected area of 236.1-acres, with an average elevation of 4660 ft. above mean <br /> sea level. Sand and gravel will be extracted for use in construction materials such as crushed <br /> rock, sand, washed rock, concrete, and asphalt. There is also the possibility of incidental fill dirt <br /> production. The maximum mining disturbance at any given time will be 53.1-acres. Exhibit L <br /> outlines the reclamation conditions for this maximum disturbance scenario and the associated <br /> bond. <br /> Access to the mine will be via the existing site entrance located on the southeast end of the <br /> operation connecting to County Road 52. To prevent groundwater infiltration into the pit and <br /> facilitate water storage after reclamation, slurry walls will be installed around the various mining <br /> areas. <br /> Dozers and scrapers will strip topsoil and overburden from mining areas, storing them in <br /> designated stockpiles or direct placing material in active reclamation areas. Any stockpile <br /> remaining for over 90 days will be seeded to prevent erosion. Sand and gravel extraction will <br /> involve loaders, excavators, dozers, and trucks, with material transported to the southern permit <br /> area for processing. While haul trucks are currently anticipated, there is potential for <br /> replacement by a conveyor belt in the future. <br /> The sand and gravel deposit, averaging 65 feet in thickness, will be mined progressively from <br /> north to south in each mining area. Topsoil and overburden averages 5-feet thick, with the top <br /> 24-inches being topsoil, on average. Mining will take place across the areas shown on Map C-2. <br /> Groundwater is anticipated to be found 5-feet below the natural topography. Mining and <br /> reclamation will occur concurrently to minimize overall disturbance. There is ample on-site <br /> topsoil and overburden for successful reclamation, transforming the site into water storage <br /> ponds surrounded by rangeland. The reclamation process will involve backfilling, regrading, <br /> topsoiling, and revegetation. Some or all of the water storage ponds may be filled based on <br /> market demands for inert fill disposal. <br /> Mining will extend to the bottom of the gravel deposit, maintaining final mining slopes at 1.5H:1V <br /> along the perimeter. The active highwall will have a near-vertical slope, progressing halfway <br /> down the final mining slope to enable the dozer to knock down the remaining highwall, creating <br /> the completed mining slope. Slopes will then be backfilled with sand or overburden to achieve <br /> the reclaimed 3H:1V slopes, with specific slope details available on Map C-3 cross sections. <br /> Mining setbacks are shown on Map C-2. No mining will take place within 150-ft of the South <br /> Platte River. Prior to mining within 450-ft of the South Platte River in Phase 2, a technical <br /> P123 Mine <br /> July 2025 D-1 Lotieki Associates <br />