2023-02-24_PERMIT FILE - M2022013 (8)

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Page 117 6.4.4 EXHIBIT D — Extraction Plan more properly reflect actual conditions on the ground in a given year of operations. At anticipated production levels and production only from the Center Section of Central Field, extraction of the remaining perimeter excavation could take 6-7± years. Extraction of the core could then commence and take 6-8± years, overlapping with initial development of the next field. With sequential development, extraction of the North-East Section of Central Field could take 3- 5± years, the West Section of Central Field 4-6± years, and the North-West Field, 6-8± years. Please Note: The time periods will depend on the actual rate of production required to meet market demand, and the average annual advance may also vary with thickness of the sand and gravel and ground conditions. Some flexibility may also be exercised to optimize operations around or through existing infrastructure if scheduled for removal. Table E-1 provides a projection of mine development and regrading/reclamation. The plan as described in this Exhibit D and also in Exhibit E, is a forecast and may vary according to market conditions with mining and subsequent regrading occurring faster or slower, sometimes significantly so. The geology may also dictate changes in the rate of extraction. If efficiency demands in a higher production demand scenario, up to f our separate areas could be developed in the manner described simultaneously. Such changes may happen quickly and would be addressed in the Annual Report. 'In discussing this flexing of production and scaling operations up or down with OMLR staff, a concern was raised as to impacts on mule deer habitat if there were separate production areas with a larger area under active production. This has been addressed as having minimal impact in a letter from Ron Beane, Senior Wildlife Biologist with wildlife consultant ERO Resources Corp attached as an addendum to this Exhibit D. As discussed above and considered in the letter from ERO Resources Corp, Raptor envisions up to four active mining areas (area of active extraction operations) of up to 16 acres could be in production simultaneously for an anticipated maximum active mining area of 64 acres. As noted in the ERO Resources letter, this area is only a small percentage of the riparian corridor within and adjacent to the extraction area and while Raptor would not anticipate exceeding 64 acres of active mining area, small and temporary variances may occur in response to market demands, coordinating operations around existing infrastructure, water management, or to ensure safe operations. The maximum disturbed area will continue to grow over the life of the operation as the post mining land use is lined water storage and as noted by the DRMS, until the basin is fully extracted and lined, and a leak test is e Adequacy Item 17:Wildlife concern VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2O22 A REGULAR IMPACT[1121 CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION MINING&SAFETY OFFICE OF MINED LAND RECLAMATION