2025-02-13_REVISION - M2020007 (6)

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EXHIBIT D MINING PLAN (CONT) The overburden not used in slurry wall construction will be properly disposed of, or sold. After the slurry wall liner is placed around a Phase, a dewatering trench will be excavated within the phase. Then a pump will be installed and dewatering will begin. This will allow the area within the slurry wall to be dry mined. The trench will be extended around the area as mining progresses . The active mining area in the reservoir phase will remain dry. After mining is completed, final reclamation of the phase can be completed, including liner certification, final grading of slopes, armoring as needed, grading the gravel band around the reservoir and initial seeding for revegetation. At this time, the reservoir may be turned over to the owners . They will be overseeing construction to complete the reservoir operations facilities and filling. As mentioned previously, any developed water storage facility construction that the landowners want to complete before an area is released from the DRMS permit falls under Reclamation Option B, and L.G. Everist will file a Technical Revision to incorporate the changes . Dewatering as mining progresses facilitates early testing of the slurry wall liner, which is required to receive liner approval certification from the State Engineer' s Office. Initial testing has started for the Phase 1 reservoir and is expected to be complete during the early summer of 2025 . In general, mining will commence in the south end of each Phase and work north. As noted above, the Alpha suffix Phases will be mined first in each general area to provide areas for disposal of excess overburden and processing fines generated from the mine. The working face will be mined near vertical to maximize removal of material from the mine. At its widest point, the working face will be approximately 2600 feet long. If mining ends prematurely, this working face slope will be reclaimed using a cut/fill sloping method instead of backfilling. As mining reaches the vertical face setbacks limits around each reservoir, mining in this band from the top of the slope to the vertical face limit will change to a slope mining method to leave the 3 : 1 final slope. We expect to have no more than 2600 linear feet of area needing final bank sloping at any one time. The mining setbacks will vary from the permit boundary and structures as allowed by each agreement for said structures and/or the Geotechnical Stability Analysis . The proposed setbacks are shown in the Setback Table on MAP EXHIBIT C 1 MINING PLAN MAP . For example, on oil/gas wells, we will maintain L.G. Everist, Inc. Ragsdale Reservoirs Revised February 11, 2025 17