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Exhibit D <br /> Page 21 <br /> described, in a process flow sequence,as follows. The process flow sheet is also described following,and <br /> graphically depicted in Exhibit D-4: Process Flow Diagram. <br /> 5.1 Overview-General Process Flow <br /> All mined materials will be processed onsite, employing both wet(wash)and dry(thermal drying followed by <br /> screening)process unit operations typical of those utilized in the sand and gravel industry. <br /> CSC notes that no hazardous or toxic process "reagents"will be introduced during the wet(or any other component) <br /> of the process;however,minor quantities of polymers(such as, for example,Clearwater Industries, Inc. "CW3M") <br /> will be utilized to facilitate the fines settling process. Such polymers are widely and routinely utilized in industrial <br /> sand mining and processing facilities throughout the U.S.and internationally. These products have been <br /> demonstrated to be non-toxic,with short duration degradation characteristics,as discussed in the"Barr White Paper <br /> Environmental Impacts of Water Treatment Chemicals at Industrial Sand Mines" (Ban-Engineering Company <br /> 2013). Both the"white paper" and the Material Safety Data Sheet for the CW3M polymer product are provided in <br /> Exhibit D-5: Use of Polymers. <br /> The"wet plant"will utilize a wet rinse scalper to initially remove oversize material(i.e.,greater than '/2"material), <br /> which will report to an oversize reject stockpile. A secondary screening process will further reduce the top size of <br /> product to#30 mesh(0.0236 inch),with the 1/2 "x#30 fraction also reporting to the oversize stockpile. As space <br /> availability may dictate,the minor quantities of oversize material will be subsequently utilized in miscellaneous site <br /> grading and/or as pit backfill. <br /> Feedstock material will be recovered from the ROM stockpile via front-end loader,and introduced to the"wet <br /> plant",which will utilize mechanical separation processes(freshwater wash)to produce a#30/#140(i.e., a less than <br /> 30 mesh but greater than 140 mesh interim product). <br /> Oversize material(i.e.,that greater than 30 mesh)will be scalped off prior to the wash process and routed to the <br /> reject stockpile. <br /> Undersize material(that less than 140 mesh but greater than 325 mesh)will be separated with cyclones, dewatered <br /> to less than 20%moisture and conveyed to the reject stockpile. <br /> Ultra-fines(#140/325)will be generated during the wash process(which will employ cyclones and attrition cells) <br /> and contained in plant effluent. Plant effluent will be processed in a rack clarifier,with clean water recycled back to <br /> the wet plant supply tank. <br /> Thickened sludge will report to belt presses where further dewatering will occur,and the resultant filter cake will be <br /> conveyed to and stockpiled at the plant. <br /> The retained material(i.e.,that less than#30)would then be pumped to a series of attrition cells to break down <br /> clusters and separate any undesirable "clayey"materials from the desired silica product.The slurried material will <br /> then be pumped to a series of cyclone separators, from which overflow will report to the water clarifier. Cyclone <br /> underflow will produce a#30 x#140 product,which will be screen-dewatered and conveyed to the Wet Sand <br /> Storage Building(as an interim product)for decanting and subsequently,removal for further(downstream) <br /> Colorado Sand Company II, LLC <br /> Kersey Mine Construction Material Regular(112)Operation Reclamation Permit Application <br /> June 7,2024 <br />