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

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Exhibit D Page 3 Dimensionally,a nominal overall pit length(i.e., active face)will typically be on the order of 2,500 ft,with the active pit floor area behind the mining face(necessary to accommodate loading and haulage of the ROM material) typically extending to approximately 300 ft in width at full mine-out of a given annual mining block. However, these dimensions will be subject to ongoing variances based on mineable resource thickness,undulating topography, and other influencing factors(e.g., operational constraints, etc.)such as(but not necessarily limited to)the following: • Presence of rights-of-way or easements; • Presence of oil and gas wells or ancillary facilities;and, • Mining Block and/or Permit Area boundaries or other defined mining limits. (e) An approximate timetable to describe the mining operation. The timetable is for the purpose of establishing the relationship between mining and reclamation during the different phases of a mining operation.An Operator/Applicant shall not be required to meet specific dates for initiation,or completion,of mining in a phase as may be identified in the timetable. This does not exempt an Operator/Applicant from complying with the performance standards of Section 3.1. If the operation is intended to be an intermittent operation as defined in Section 34-32.5-103(11)(b), C.R.S.,the Applicant should include in this exhibit a statement that conforms to the provisions of Section 34-32.5-103(11) (b), C.R.S.Such timetable should include: (i)an estimate of the periods of time which will be required for the various stages or phases of the operation; (ii)a description of the size and location of each area to be worked during each phase;and, (iii) outlining the sequence in which each stage or phase of the operation will be carried out(Note: Timetables need not be separate and distinct from the mining plan,but may be incorporated therein); A detailed operational timeline projection is provided in the accompanying Exhibit D-1: Plan of Operations— Kersey Mine Project More generally,it is anticipated that site development activities will commence within three(3)months following procurement of all necessary permits,approvals,and authorizations. Such activities will include plant area site preparation and initiation of the mine box cut to develop a run-of-mine(ROM,or to-be-processed)material stockpile adjacent to the process plant area,while simultaneously establishing sufficient void space to accommodate the initial Process Discard Stockpile(PDS)and long-term growth medium stockpile(TS-1)features,respectively, thus readying the mining zone for full-scale,steady-state mining operations. CSC envisions a duration of approximately 10 to 12 months for site development,plant construction,initial pit development,and plant commissioning.Once all facilities are in place and fully functional,a rapid ramp-up to the "full-scale"production level is projected to occur,with the Year 1 production level anticipated to achieve a nominal 5 million tons. At a steady-state production level of(a nominal)5 million tons of run-of-mine(ROM)per year,the life-of-mine (LOM)is currently projected to be twenty(20)years. Additional mineable sand resources are known to be present in areas that remain to be fully delineated through additional exploration;each of these areas have been designated as a Temporary Mining Deferral Zone(TMDZ),with TMDZ-1 encompassing the southeast quadrant of the Permit Area and TMDZ-2 the south-southwestern most portion of the Permit Area,respectively. The overall duration of actual mining(and processing)activity(i.e., life-of-mine)is largely influenced by the total available(economically viable) reserve base;however, it may also be subject to influencing market conditions,unforeseeable mining or processing interruptions,and/or weather-induced delays,etc. Colorado Sand Company II, LLC Kersey Mine Construction Material Regular(112)Operation Reclamation Permit Application June 7,2024