2025-12-12_PERMIT FILE - M2025063 (2)

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EXHIBIT D MINING PLAN(CONT) and have ditches as necessary to collect runoff. Any runoff from the road will be retained on-site and allowed to soak into the ground or evaporate. The road will be maintained as needed. Maintenance roads will be built around the mining area to provide access for the farmer. The access roads will remain when recla- mation ends as they will be used to access the property. GEOLOGIC SETTING The affected lands are located along the South Platte River in a Quaternary age, Piney Creek alluvial deposit . The eastward dipping beds of upper Cretaceous age are overlain at an angular unconformity, by the Piney Creek alluvium. The sand and gravel encountered in the Piney Creek alluvium are a result of water erosion and redeposition of rock materials from the Front Range of the Rocky Mountains. The deposition of this material occurred during a time when the river was much larger than it is now. But, judging from the scarcity of large rocks found at the loca- tion, the velocity of the river must have slowed sufficiently to have dropped boulders and most large cobble before it reached this point . This type of material is typically found from south of Denver to the Colorado state line along the South Platte River. On this site only the upper 25 to 30 feet of dry material will be mined. The thickness of the mineral deposit varies from 8 to 52+ feet and the average depth on this mine is approximately 40 feet . However, at this time the plan is to mine only the above ground- water material, approximately 30 feet deep, to avoid exposing ground water to evaporation. There is a 10 to 12 inch layer of topsoil, consisting of loam and 24 to 36 inches of a clay loam to sandy clay loam overburden on top of the gravel. This alluvium is a well-sorted gravely sand and silt, predominantly granitic and quartzite material with minor amounts of gneiss, schist and sandstone. The bedrock under the surface gravel is a grey to grey black shale that is impervious . SOILSAND OVERBURDEN The SOILS MAP IN EXHIBIT 1, shows the soil types as delineated by the National Resource Conservation Service (NRCS) and was obtained from their website. The information contained in EXHIBITI/J will provide background levels for the site as reclamation begins on the entire area. The depths of the topsoil and overburden, shown in the following table were obtained from drill logs provided by the original property owner. 8 1/2 Enterprises LLC. December 9, 2025 Sasaki Pit 7