2021-03-09_REVISION - M2001046 (17)

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EXHIBIT D - MINING PLAN The information provided in this Exhibit is intended to satisfy the requirements outlined in Section 6.4.4 of the Colorado Mined Land Reclamation Board Construction Material Rules and Regulations: This Mining Plan is consistent with both an oil and gas-constrained and a full recovery plan, as both are illustrated in Exhibit C. • Exhibit C, Sheet 2:The oil and gas-constrained plan avoids impacts with existing oil and gas facilities. A number of existing facilities are non-producing and/or subject to rights assigned to the Operator/Applicant. Any facility that is controlled by the Operator may be removed or relocated according to applicable agreements and regulations. • Exhibit C, Sheet 3:The full recovery plan shows mining and reclamation scenarios where all current oil and gas facilities are removed or relocated, minimizing the linear run of slideslopes and consequently the surface area of future reservoir banks. It is anticipated that each incremental removal or relocation of oil and gas equipment will reduce reclamation liability,and the Operator may therefore request an associated reduction in financial warranty. Bonding under Exhibit L is based on the higher financial liability amount associated with oil and gas-constrained recovery. (a) Description of the method(s)of mining to be employed in each stage of the operation as related to any surface disturbance on affected lands; The permit area includes a significant deposit of sand and gravel located in the alluvium of the Saint Vrain River in Weld County. The site is located south of Highway 66,west of Weld County Road 19, north of Weld County Road 28 and east of Weld County Road 17. It encompasses 307.2 acres and consists of two cells(cell 2 and 3), a silt pond and a freshwater pond. Site Preparation: Initial disturbance of the property will include: stripping the topsoil and overburden material, constructing the slurry walls. m2in : Scrapers will strip the topsoil and overburden material from a given phase and place stockpiles in the processing area. Any excess material not needed for reclamation may be sold or hauled off-site during the life of the mine. There will be no mining below the groundwater table until the slurry wall is complete,tested and approved. Each phase will be dry-mined using scrapers, bulldozers,front-end loaders, excavators, or similar equipment. The mining in the site will progress in 4 stages. Stage 1 will establish the siltation and freshwater ponds in the southwest corner of the site. Stage 1 will open up approximately 27 acres and will be reclaimed last. Stage 2 though stage 4, ranging in size from 41 to 75 acres,will start in the northeast comer and will proceed southwest ending in Cell 7. The operator will develop and comply with a Stormwater Management Plan and Spill, Prevention, Control and Countermeasures Plan. The operator will notify the Division of Reclamation and Mine Safety and in the event of a reportable spill. Nix—Gravel Mine—MLRB 112 Permit Amendment Exhibit D-1 Page 11 of 126