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Phase 2: This phase will consist of approximately 2a and 2b and will take <br /> approximately 7 years to mine and 2 years to reclaim. <br /> Phase 3: This phase will consist of the eastern cell and will take approximately 3 years <br /> to mine and 2 years to reclaim. <br /> Reclamation will begin immediately after mining is complete. When possible, <br /> concurrent reclamation practices will be used to minimize site disturbance and to limit <br /> material handling to the greatest extent possible. Please refer to the Mining Plan Map <br /> in Exhibit C for phase areas to be mined, locations and areas. The table below <br /> summarizes the approximate quantities in the mining areas. <br /> Mining Phase Gravel Overburden Time <br /> (tons) (tons) (yrs) <br /> 1 1,200,000 148,000 2.4 <br /> 2a 1,900,000 244,000 3.8 <br /> 2b 1,600,000 197,000 3.2 <br /> 3 1,700,000 242,000 3.4 <br /> Total 6,400,000 831,000 12.8 <br /> (0 Use Mining Plan Map in conjunction with narrative to present: <br /> (i.) Nature, depth and thickness of the deposit and thickness and type of <br /> overburden to be removed <br /> Exploratory borings drilled (December, 2017) primarily along the perimeter of the <br /> site, encountered approximately two to four feet of overburden topsoil, silty sands <br /> and sandy lean clays overlying approximately 22 top 45 feet of sand and gravel on <br /> top of primarily claystone bedrock. Refer to the Stability Analysis (Exhibit S)for <br /> locations of the property extents and boring locations. The bedrock depths in the <br /> proposed mine areas ranged from approximately 25 feet to 45 feet below the <br /> ground surface. <br /> (ii.) Nature of the stratum immediately beneath the material to be mined in <br /> sedimentary deposits <br /> The site is located approximately 20 miles east of the foothills of the Colorado <br /> Front Range on the western flank of the Denver Structural Basin. The basin is a <br /> downwarp of sedimentary strata that tends north-northwest, parallel to the <br /> mountain front. In the project area,the sedimentary bed dips gently eastward <br /> toward the axis of the basin east of the site. Based on regional geologic mapping <br /> (Colton, 1978), the near surface bedrock in the project area is the Paleocene and <br /> Upper Cretaceous Denver and Arapahoe Formations. The bedrock is overlain by <br /> upper Pleistocene and Holocene (Quarternary age) gravel deposits and eolian <br /> (wind blown)overburden soils. The gravel deposits exist primarily within the <br /> Burnco Colorado, LLC—Inouye Gravel Mine—MLRB 112 Permit Application <br /> Exhibit D-3 <br />