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

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Exhibit D Page 4 Concurrent reclamation will occur during the mining operation, currently projected to commence in Year 3, such that all mining blocks will have been reclaimed at such time mining operations cease. Each reclaimed mining block will be individually subject to a five-year monitoring and maintenance period to ensure successful revegetation and stabilization. Final site closure and reclamation will commence following completion of all mining and processing operations. Terminal pit reclamation will occur concurrent with plant facilities demolition and pad area recontouring,with the reclaimed plant area receiving a nominal 12-inch horizon of growth medium (obtained from TS-1,which is largely dedicated to fmal reclamation activities),as further described in Exhibit E: Reclamation Plan.CSC will similarly carry out post-closure monitoring and maintenance for all otherwise(more recently)reclaimed areas associated with the pit operations(and related haul road infrastructure)for a period of five-years upon completion of all final site reclamation activities. () A map(in Exhibit C:Pre-Mining and Mining Plan Map(s)of Affected Lands,Sub-section 6.4.3)may be used along with a narrative to present the following information: (i)nature,depth,and thickness of the deposit to be mined and the thickness and type of overburden to be removed(may be marked "CONFIDENTIAL"pursuant to Paragraph 1.3(3);and, (ii) nature of the stratum immediately beneath the material to be mined in sedimentary deposits; Due to the nature of the deposit,no "overburden"(in the traditional usage of that term)has been identified as being present;therefore,no "overburden",per se, is anticipated to be encountered or removed. There is,however,a nominal 12-inch thick surficial "growth medium"horizon that has been confirmed as consistently present throughout the mineable zones within the Permit Area. That nominal 12-inch depth of growth medium will be pre-stripped in advance of mining,and initially stockpiled in the long-term growth medium stockpile(TS-1)for utilization in final site reclamation activities. Conversely,under steady-state operational conditions pre-strip growth medium volumes will be largely dedicated toward concurrent reclamation;however, minor(surplus)volumes will likely be added to TS-1 and/or intermittently utilized toward feature-specific "advance"reclamation in order to minimize outstanding reclamation obligations at the end of life-of-mine. Beneath the nominal 12-inch growth medium zone,the immediately underlying sand(typically a+/-30-ft horizon; but,extending to as much as 50-ft depth in localized areas)is considered mineable material(otherwise referred to as ROM material)that will be subject to processing.As such,it will be excavated and delivered directly to the ROM stockpile(proximal to the processing plant)for wet processing, subsequent drying,and temporary silo storage. Actual mining depth in localized areas will be largely dependent on the presence of intervening clay lenses(if any) and/or other quality characteristics;however,operational/physical conditions encountered with the pit floor may also dictate maximum depth of mining. Exploratory drilling completed to date indicates that the target sand horizon,while variable in thickness, can extend to a depth of as much as 50 ft below existing ground surface.It is CSC's intent to mine a depth horizon sufficient to ensure that the Kersey Mine's economic objectives are attained,which are,in turn,anticipated to be largely dependent on physical mining constraints(sand zone thickness)as well as projected mineral processing recovery factors. While most areas projected for mining will likely be suited to a two-bench configuration(i.e.,a 25 to 30 ft depth),localized deeper areas(up to 50-ft depth)will likely require one or more additional benches to optimally extract the sand resource. Colorado Sand Company II, LLC Kersey Mine Construction Material Regular(112)Operation Reclamation Permit Application June 7,2024