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1 a slurry wall will be installed around the perimeter of Phase 1 and extend to Phase 2. The <br /> estimated time for mining Phase 1 is approximately 4 years. The operator is proposing to mine <br /> Phase 2 second that is 24.08 acres and during this mining there will be the same 65.4 acres <br /> disturbed that were in addition to Phase 1's 27.15 acres for a total of 104.61 acres that will be <br /> the maximum disturbed area and a Technical Revision will be requested prior to mining into <br /> Phase 2. The estimated time for mining Phase 2 is approximately 3 years and 6 months. The <br /> operator plans to mine Phase 3 next and prior to mining Phase 3 a slurry wall will be installed <br /> around the perimeter. Phase 3 is 48.69 acres and there will be 102.07 acres disturbed as the <br /> areas for Phase 1 and 2 will be part of a reclaimed reservoir and likely released when Phase 3 <br /> mining starts. The stockpile areas will move to the bottom of Phase 3 after the southern portion <br /> of Phase 3 is mined. The estimated time for mining Phase 3 is approximately 10 years. The <br /> operator plans to mine Phase 4 next and prior to mining Phase 4 a slurry wall will be installed <br /> around the perimeter. Phase 4 is 40.43 acres and there will be 70.16 acres disturbed as the <br /> area for Phase 3 will be part of a reclaimed reservoir and likely released when Phase 4 mining <br /> starts. The stockpile areas will be in Phase 4 and move to the bottom of Phase 4 after the <br /> southern portion of Phase 4 is mined. The estimated time for mining Phase 4 is approximately 8 <br /> years and 5 months. The operator plans to mine Phase 5 next and prior to mining Phase 5 a <br /> slurry wall will be installed around the perimeter. Phase 5 is 33.76 acres and there will be 53.64 <br /> acres disturbed as the area for Phase 4 will be part of a reclaimed reservoir and likely released <br /> when Phase 5 mining starts. The stockpile areas will be in Phase 5 and move to the bottom of <br /> Phase 5 after the southern portion of Phase 5 is mined. The estimated time for mining Phase 5 <br /> is approximately 7 years and 4 months. <br /> The mining will progress in each phase beginning at the outer edge of the phase where material <br /> will be moved toward the interior of the phase such that a 3HAV mining slope can be <br /> established on the exterior of the phase and then transition to a 3HAV slope. The mining slope <br /> will be established for the entire perimeter of the phase in 3 to 6 feet intervals. In Phases 1 —5 a <br /> dewatering trench around the perimeter will be placed at the toe of the 31-1:1 V or 31-1:1 V mining <br /> slope. As the phase is mined deeper the dewatering trench will be lowered and moved laterally <br /> along the 3HAV and then the 3HAV mining slope toward the center of that phase. Once the <br /> interior footprint becomes small enough where the 3H:1 V mining slopes from three to four sides <br /> are encroaching upon the portable plant and haul roads another phase will be opened to <br /> continue mining. <br /> Dewaterinq <br /> Dewatering trenches will be placed along the perimeter of each mining area in Phases 1 — 5. <br /> The dewatering trench around the perimeter of the phase being mined will be placed at the toe <br /> of the 3H:1V mining slope. As the phase is mined deeper the dewatering trench will be lowered <br /> and moved laterally along the 3HAV mining slope toward the center of that phase. Once the <br /> interior area becomes small enough where the 3H:1 V mining slopes from three to four sides are <br /> encroaching upon the portable plant and haul roads another phase will be opened to continue <br /> mining. The slurry wall is anticipated to be installed around the perimeter of Phase 1 and prior to <br /> starting mining in Phase 2 and it is expected minimal dewatering will be required in the <br /> subsequent phases due to the slurry wall cutting off groundwater infiltration into the pit. J-2 <br /> Contracting Company will have an approved substitute water supply plan and well permit prior <br /> to exposing groundwater. The substitute supply plan will be updated annually to account for <br /> water that is consumed due to exposing groundwater by the mining operation. <br /> Explosives <br /> Explosives will not be used during mining. <br /> JET Consulting, J-2 Contracting Company <br /> ■ g DPG Mining Site <br /> ■ DRMS 112 Permit Application <br />