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RECEIVED <br /> NOV 0 7 2022 <br /> EXHIBIT D - MINING PLAN pIyl$10N L7 REGLANIp►T" <br /> The information provided in this Exhibit is intended to satisfy the requirements outlined in Section 6.4.4 of <br /> the Colorado Mined Land Reclamation Board Construction Material Rules and Regulations: <br /> (a) Description of the method(s)of mining to be employed in each stage of the operation as <br /> related to any surface disturbance on affected lands; <br /> The permit area includes a significant deposit of sand and gravel located in the alluvium of the <br /> South Platte River in Weld County. The site is located south of Highway 66,west of Weld <br /> County Road 19, north of Weld County Road 28 and east of Weld County Road 17. It <br /> encompasses 631.58 acres(plus or minus)and consists of seven slurry wall lined,and an <br /> unlined silt pond. Prior to starting construction of any slung wall, a Technical Revision to <br /> update the site bonding will be applied for and will include the slurry wall design report. <br /> Site Preparation: <br /> Initial disturbance on the property will be stripping overburden in the eastern portion of Cell 8 <br /> to establish the plant footprint.Concurrently with establishing the plant,the first phase of the <br /> Fresh Water Pond and the first phase of the Siltation Pond will be stripped of overburden and <br /> mining will commence in these phases once the plant has been established. <br /> After the initial preparation of the Plant, Fresh Water Pond and Siltation Pond,the Concrete <br /> Batch Plant and Asphalt Plant areas will be established and constructed. Customer roads will <br /> be established from the entrance to the plant areas. <br /> The current house on the west side of the property will be utilized as the office and a shop will <br /> be constructed in the early phases of site development.A parking area for employees will be <br /> constructed adjacent to the office and shop area. <br /> Mining: <br /> Scrapers will strip the topsoil and overburden material from a given phase and place stockpiles <br /> in the processing area. Any excess material not needed for reclamation may be sold or <br /> hauled off-site during the life of the mine. There will be no mining below the groundwater table <br /> until the slung wall is complete,tested and approved for each slung wall lined cell. For unlined <br /> cells,there will be no mining below the groundwater table until an approved Substitute Water <br /> Supply Plan(SWSP) has been obtained. <br /> Each slurry wall lined phase will be dry-mined using scrapers, bulldozers,front-end loaders, <br /> excavators,or similar equipment. The Fresh Water Pond and Siltation Pond will be unlined an <br /> wet mined with excavators. <br /> Mining at the site will progress in eight major stages comprised of minor phases expected to <br /> last approximately one year.A map depicting the phases can be found in Exhibit C-5. <br /> Stage 1 -will establish the Aggregate Plant,the Siltation Pond,the Freshwater Pond, and will <br /> mine out the future commercial area in the south-west comer of the site. These areas, <br /> excluding the Aggregate Plant,will be wet mined with excavators. Stage 1 is expected to last <br /> approximately 2 years. <br /> Topsoil mined from phase one will be segregated and utilized to establish a berm along the <br /> north-western boundary of the site along Weld County Road 44 and Colorado State Highway <br /> Section 20—Gravel Mine—MLRB 112 Permit Amendment <br /> Exhibit D-1 <br />