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M-2019-028—J-2 Contracting Co.—DPG Pit—Technical Revision Request No. 1 <br /> April23, 2021 <br /> -2- <br /> changing. Phase 1 will be changed to 10.44 acres. Phase 1 will be dry mined by dewatering to create <br /> room for wash fines storage from the wash plant. Phase 1 will be mined with a 2H:1 V mining slope and <br /> will be backfilled with fines from the processing of the gravel. No slurry wall will be constructed around <br /> Phase 1. <br /> Phase 2 will be changed to 54.21 acres. Phase 2 will have a slurry wall constructed around its <br /> perimeter combined with Phase 5's perimeter and will be dry mined by dewatering after the slurry wall <br /> is installed. Phase 2 will be mined with a 3H:1 V mining slope. <br /> Phase 3 will be changed to 10.59 acres. Phase 3 will be dry mined by dewatering to create room for <br /> wash fines storage from the wash plant. Phase 3 will be mined with a 2HA V mining slope and will be <br /> backfilled with fines from the processing of the gravel. No slurry wall will be constructed around Phase <br /> 3. <br /> Phase 4 will be changed to 93.03 acres. Phase 4 will have a slurry wall constructed around its <br /> perimeter and will be dry mined by dewatering after the slurry wall is installed. Phase 4 will be mined <br /> with a 3HAV mining slope. <br /> Phase 5 will be changed to 19.39 acres. Phase 5 will house the processing facilities for the mine until <br /> Phases 1-4 are mined; then the processing facilities may be moved to the bottom of Phase 2 to <br /> complete mining of Phase 5. Phase 5 will share the slurry wall constructed around its perimeter and <br /> Phase 2's perimeter and will be dry mined. Phase 5 will be mined with a 3HAV mining slope. <br /> See the attached updated Exhibit C Pre-Mining/Mining Plan Maps, Exhibit D Mining Plan narrative, and <br /> slope stability analysis for the mining slopes by Civil Resources. <br /> Exhibit F - Reclamation Plan and Exhibit E Reclamation Plan Narrative: Revision to the <br /> Reclamation plan to updated the reclamation for the updated phasing and water storage <br /> reservoirs. <br /> Phase 1 will be changed to 12.99 acres. Phase 1 will be reclaimed by placing wash fines over time to <br /> fill in the area that is mined. <br /> Phase 2 will be changed to 63.81 acres. Phase 2 will have a slurry wall constructed around its <br /> perimeter combined with Phase 5's perimeter to be reclaimed as water storage and Reservoir 1. <br /> Phase 3 will be changed to 15.13 acres. Phase 3 will be reclaimed by placing wash fines over time to <br /> fill in the area that is mined. <br /> Phase 4 will be changed to 101.96 acres. Phase 4 will have a slurry wall constructed around its <br /> perimeter to be reclaimed as water storage and Reservoir 2. <br /> Phase 5 will be changed to 22.26 acres. Phase 5 will share the slurry wall constructed around its <br /> perimeter and Phase 2's perimeter will be reclaimed as water storage and Reservoir 1. <br /> See the attached updated Exhibit E Reclamation Plan narrative, Exhibit F Reclamation Plan Maps, and <br /> Delta Reservoir design memorandum by Galloway. <br /> I l 305 Denver Avenue—Suite D•Fort Lupton CO 80621 •Ph: 303-857-6222•Fax: 303-857-6224 <br />