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Mining Plan Exhibit D <br /> 1 . General Mining Plan <br /> Map C-2, located in Appendix 1, shows the mining plan. The property boundary has been surveyed <br /> on site and the permit area will be surveyed prior to any new site disturbance. <br /> The Spring Creek Pit will involve the disturbance of roughly 87 acres of sand and gravel from <br /> rangeland located approximately three miles northwest of Montrose, CO. The mine is operated by <br /> Oldcastle SW Group, Inc. dba United Companies of Mesa County. It is located approximately one- <br /> quarter mile west of 61.75 Road and one-half mile north of LaSalle Road in Montrose County, <br /> Colorado. Mining is currently taking place in the southernmost parcel of the 200-acre permit area. In <br /> 2009, an amendment was made to the permit to include two adjacent parcels to the north to be <br /> mined. These parcels are currently being leased for agricultural use and will be removed from the <br /> permit following the sale of the properties. Additionally, a revision was made to the permit in 2019 to <br /> allow the mining of the berm separating the Spring Creek Pit from the LaSalle Pit to the north and <br /> east. The mining plan is being revised to adjust the disturbance limit to include the remaining areas <br /> to be mined in the original permit area (the parcel currently being mined) as well as the area <br /> between the adjacent gravel pit. The northern parcels added in a previous amendment will be <br /> removed from the mining plan. <br /> The gravel zone at Spring Creek is approximately 30 feet thick overlain by roughly one foot of <br /> topsoil and a layer of overburden ranging from one to three feet thick. The deposit is part of the <br /> Uncompahgre alluvial deposit of the Quaternary late Pleistocene era sitting atop the Spring Creek <br /> Mesa. Underlying the deposit is the Mancos Shale, specifically the Dakota Sandstone and Burro <br /> Canyon Formation of the Cetaceous Age, consisting of sandstones, conglomerates, and local beds <br /> of coaly shale. Mining in the new areas is planned to a total depth of approximately 25 feet so the <br /> operator will not be mining into any shale or other bedrock encountered. This is consistent with <br /> current mining depths in the previously mined areas. In the case of the operator reaching the shale <br /> bedrock prior to the 25-foot mine depth, the pit will be backfilled to two feet above the shale zone <br /> and the maximum mining depth will be adjusted accordingly. <br /> Mining in the new areas will start with removal of topsoil and overburden with front-end loaders. <br /> Topsoil will be stockpiled and revegetated for use in reclamation. Overburden will be stockpiled <br /> separately for use as backfill in the reclamation of the mine. The raw gravel will then be extracted <br /> and loaded into a crusher/screen plant to create various sized products to be stored in separate <br /> stockpiles within the mine. Dozers, scrapers, and haul trucks may also be used to move topsoil, <br /> overburden, or gravel as needed. <br /> Mining will generally commence from the southeast to the northwest. Mining activities are expected <br /> to occur approximately 4 to 6 months out of the year depending on demand and weather conditions. <br /> Processing operations such as screening/crushing and washing can occur any time of the year. The <br /> maximum mining extents are shown in Map C-2 showing slopes no steeper than 2H:1 V to maximize <br /> gravel recovery. Mining has previously been completed in five 20-acre phases which take <br /> approximately three to five years to complete. The final areas to be mined are over 20 acres spread <br /> Spring Creek Pit <br /> September 2021 D-1 Cewicki&Associates <br />