2024-06-07_PERMIT FILE - M2024026 (23)

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Exhibit D Page 7 EXHIBIT D-1 PLAN OF OPERATIONS -KERSEY MINE 1. Introduction The Kersey Mine will be an industrial sand mine with an anticipated(producing)life-of-mine of approximately 20 years. This would be preceded by an anticipated 1-year pre-production period to complete plant and ancillary facilities construction and accommodate initial pit development; and,followed by an anticipated 1-year closure and reclamation period and a subsequent 5-year post-closure monitoring period. Thus,the overall(all-inclusive)life-of- mine.is projected to be on the order of twenty-six(26)years. In the event additional mineable resource is validated within Temporary Mining Deferral Zone(s)TMDZ-1 and/or TMDZ-2,respectively, life-of-mine may extend proportionately on the continued basis of producing a projected nominal 5 million tons per year of run-of-mine(ROM)material. In that event,mining and reclamation activities (and closure/reclamation obligations)would remain generally consistent with those of the 20-year LOM,albeit subject to a proportionate time shift(i.e., an extension of LOM). 2. Oil and Gas Production Infrastructure Considerations Much of the proposed mining area at the Kersey Mine is currently(or previously has been)dedicated to oil and gas production.Accordingly,related oil and gas infrastructure,along with relatively dense well spacing is characteristically present throughout the planned mining zone(s). Avoidance of these features,adherence to appropriate setbacks(i.e.,buffers),or physically relocating structures outside of mining limits(such as lowering plugged and abandoned well casings)is an integral component of long- term mine plan development.CSC has had,and continues to have,close interaction with the current owners/operators(Chevron Corporation, Bonanza Creek Energy Operating Company,LLC, and DCP Operating Company LP)of these oil and gas production facilities to ensure that appropriate closure/abandonment plans(and the projected scheduling thereof)for currently operational and/or existing features are fully integrated into the Kersey Mine permitting effort.Negotiations are on-going between CSC and Chevron Corporation for the structures operated and owned by Chevron Corporation within the permit area boundary. CSC has conducted a geotechnical stability analysis in lieu of the required structure agreement with Chevron which demonstrates that the likelihood for adverse effect is minimal, if any(see Exhibit S-4,Stability Analysis Report). The following plan incorporates requisite operational safety considerations: • Pre-mining Reconnaissance—Pre-mining reconnaissance to confirm the presence or non-presence of oil and gas infrastructure will be conducted a minimum of one year prior to development/mining of the projected mine block. The pre-mining reconnaissance will include review of existing survey data,review of the Colorado Energy and Carbon Management Commission(ECMC; formerly the Colorado Oil&Gas Conservation Commission)database information,and field verification to determine the presence of oil and gas infrastructure. Colorado Sand Company II,LLC Kersey Mine Construction Material Regular(112)Operation Reclamation Permit Application June 7,2024