2021-04-05_PERMIT FILE - M2021030 (2)

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(i.) Nature, depth and thickness of the deposit and thickness and type of overburden to be removed Exploratory borings were performed by Hunt Farms. The bedrock depths in the proposed mine areas ranged from approximately 20 feet to 30 feet below the ground surface. Groundwater ranges from 4 feet to 18 feet in the four wells that were drilled onsite. (ii.) Nature of the stratum immediately beneath the material to be mined in sedimentary deposits The site is located approximately 15 miles east of the foothills of the Colorado Front Range on the western flank of the Denver Structural Basin. The basin is a downwarp of sedimentary strata that tends north-northwest, parallel to the mountain front. In the project area, the sedimentary bed dips gently eastward toward the axis of the basin east of the site. Based on regional geologic mapping (Colton, 1978), the near surface bedrock in the project area is the Paleocene and Upper Cretaceous Denver and Arapahoe Formations. The bedrock is overlain by upper Pleistocene and Holocene (Quarternary age) gravel deposits and eolian (wind blown) overburden soils. The gravel deposits exist primarily within the Broadway Alluvium deposit. The bedrock unit consists mainly of claystone and may contain lenses of siltstone and sandstone. (g) Identify the primary and secondary commodities to be mined/extracted and describe the intended use. The primary commodities are reclamation fill; intended for construction materials. (h) Name and describe the intended use of all expected incidental products to be mined/extracted by the proposed operation. There are no expected incidental products to be mined. (i) Specify if explosives will be used in conjunction with the mining (or reclamation) No explosive material will be used on-site. Hunt Farms—WCR 40 Dirt Mine—MLRB 112 Permit Amendment Application Exhibit D-3