2021-02-08_PERMIT FILE - M2021009 (11)

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Mitigation Plan Miti � ERC g Young Ranch Resource Phase 1 mining is expected to last 5-10 years (-2021-2030). An access road will be developed up to the top of Phase I. Mining will occur from the top of the Phase I area (-8,300 ft in elevation) down to the Project entrance (-8,050 ft). Drilling and blasting will occur with Phase 1, and coarse material will be moved using heavy equipment to the processing area constructed during the pre-mining phase. Up to two benches will be worked at any given time during Phase I using a 2:1 slope wall angle. The northern most slopes immediately adjacent to the CCP will remain undisturbed providing a buffer between the highway and the Project. Phase 2 mining is expected last 50 years up to approximately 2080 and will consist of permanent processing facilities installed into the Phase I area. All stormwater will be directed down drainages towards the northern extent of a new CCP through road, as shown on Figure 2. The purpose of the CCP through road is to shorten the overall length of the CCP while allowing mining to continue. This replacement road will be available for use following the completion of Phase 2. The old portion of the CCP will be closed to the public and will be utilized at the discretion of the landowner. Phase 3 mining will last approximately 40 years up to approximately 2120 when the Project will be permanently closed. Phase 3 mining will include both sand, gravel, and bedrock resources. A small sand and gravel resource, relative to the mineable bedrock, may be mined earlier during Phases 1 or 2 depending on market demand. The majority of the southernmost face adjacent to the CCP will remain undisturbed to create a visual and sound buffer to Interstate 70 (1-70) and to maintain a deed restricted wildlife migration corridor along the south side of the Project. For all three phases, interim reclamation will occur following completion of each bench. As shown on Figure 2, the two drainages to the east of the CCP will be used as waste rock landform areas for non-marketable material. Waste rock landform materials will be initially hauled from the processing area to the landform areas by truck. If feasible, an underpass or large box culvert will be installed for conveyor access to the waste rock landform areas.The western portion of the waste rock landforms(areas closest to the CCP) will be developed first and the eastern portion will be developed during Phases 2 and 3. 1.3 RECLAMATION Reclamation will occur throughout all mining phases to ensure that vegetation within previously developed portions of the Project become re-established to provide forage for wildlife. Trees will be planted on the wetter north and east facing slopes and a dry rangeland seed mix will be used for the south and west facing slopes. Post-Project topography will include bedrock outcrops and sporadic cliff faces to mimic the natural landscape. Hydroseeding will occur on each dump lift once the next dump lift is initiated as well as on steeper slopes where drill seeding is not feasible. Flat pads (i.e., processing area) will be revegetated using drill seeding methods during final site reclamation. Topsoil will be generated on-site using waste fines from mining and screened with imported topsoil, as needed, or amended with fertilizer. Certified weed-free mulch/wood straw will be used to stabilize the soil surface and retain moisture during germination. Following all three mining phases, the following permanent features will remain: new CCP road, portions of the old CCP road, on-site access roads (per landowner request), and wildlife crossings. 3