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

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Exhibit D Page 22 processing. The cyclone overflow, a#140 x#325 waste fines slurry, considered a process reject material,will be dewatered and conveyed to the process discard stockpile(PDS). [Note: During upset conditions, sludge will be pumped from the clarifier to a holding cell(HC-1)to be located proximal to and southeast of the process plant facilities. Once HC-1 is at full capacity,a second cell(HC-2)will be established adjacent to HC-1,and all conveyance piping re-allocated to the second cell. HC-1 will be allowed to naturally dewater through the combined effects of evaporation and infiltration,and once deemed effectively "dry", will be cleaned out utilizing excavators and trucks. The excavated material will then be hauled to either the process discard stockpile(PDS)or a proximal pit floor location, if available. Once HC-1 has been cleaned out, it will be available for use in subsequent upset conditions.HC-2 will follow the same procedures for clean out and re-use.] The clarifier unit will receive all plant effluent; solids will be settled out(polymers may be employed to facilitate the settling process),and the resultant clarified water re-introduced(recycled)to the wash process.Belt filter presses will be utilized to reduce the water content of the clarifier underflow,with the liquid effluent reporting back to the clarifier. The resultant filter cake will be temporarily stockpiled(by radial stacker)and routinely removed, as space constraints may dictate,to the reject or process discard stockpile(PDS). The wet sand(i.e.,the intermediate silica product),will be conveyed to the Wet Sand Storage Building where it will be stockpiled by tripper conveyor and allowed to passively decant(through drain-down processes),thus reducing the residual water content. Drain-down fluids will be collected via an underdrain system and returned to the water clarifier unit. The post drain-down intermediate product will then be routed to a drying plant, where it will be passed through gas- fired rotary dryer unit(s), after which all material will report to a 1/16" scalping screen to remove any foreign material from the product that may have been introduced during the transfer and/or drying processes. The reject material(minor quantities)will be collected from under individual scalping screens and moved to pit as part of back fill process. Each gas fired rotary dryer will be equipped with a cyclone and bag house to remove fines material(particulate) from the air flow stream;this fines "reject"will be conveyed to a small "reject" stockpile,where it will remain until space constraints dictate removal to the process discard stockpile(PDS).The desired less than#30 but greater than #140 mesh interim product(hereafter referred to as "#30/140")end(saleable)product emanating from the gas-fired rotary dryer and scalping screen circuit will be conveyed to the Dry Sand Storage Building,where tripper conveyors will again be utilized to stockpile the product. Final product from Dry Sand Storage Building will be removed by reclaim gates and conveyed to the product load- out silos. Product load-out silos will be positioned above scales and will function as "surge bins"to facilitate truck loading(to third-party over-the-road tractor-trailer units),utilizing a telescoping spout with integrated dust control. 5.2 Plant Operating Schedule The Kersey Mine plant and loadout operations are anticipated to operate on a 24-hour basis, seven days per week. Two 12-hour shifts per day are planned, and an estimated twenty to forty(20-40)persons are anticipated for each shift(for a total of 144). The breakdown of the onsite personnel is anticipated to be two shift rosters of four to eight (4- 8)management personnel each shift, and two shift rosters of sixteen to thirty-two(16-32)laborers each shift. Colorado Sand Company II, LLC Kersey Mine Construction Material Regular(112)Operation Reclamation Permit Application June 7,2024