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Exhibit J Skull Creek Sand Project <br /> Mining & Backfill Sequence <br /> Prior to mining, all recoverable soils within the affected area will first be salvaged (between 2"- <br /> 6") and stored in windrow stockpiles surrounding the various operational areas as depicted on <br /> Map D-3. Mining will then commence by excavation of the exposed Dakota outcrop within Pit <br /> E-1. Once the outcrop has been removed, alternating blocks of overburden and Dakota <br /> Sandstone will be excavated until the pit bottom is reached. Access to the pit bottom will be <br /> accomplished by temporary ramps built into the progressing pit highwall to the west. <br /> Overburden spoil from Pit E-1 will be hauled out of the pit and placed on the SPRS for eventual <br /> rehandle and backfill into the final pit void of Pit E-5. Following the completion of Pit E-1, <br /> concurrent in-pit backfill will be utilized to avoid ex-pit haulage and to expedite reclamation. <br /> Once concurrent backfill has begun, each successive pit will be mined from East to West in the <br /> same manner with the overburden being placed in the previously mined pits up to the designed <br /> final reclamation topography (See Exhibit E). When mining of Pit E-5 is complete,the SPRS will <br /> be fully re-excavated and hauled back to the pit for final reclamation. <br /> Map D-1 also depicts the approximate timing and production for full excavation of pits E-1 to E- <br /> 5. This timing assumes a first year at half capacity and a second year at full production. <br /> Product Streams <br /> Aside from the Dakota Sandstone, all other materials will be considered waste and placed in <br /> backfill for reclamation. <br /> Surface Water <br /> There are not any surface water diversions or impoundments anticipated on the project site. <br /> Explosives <br /> The use of explosives onsite for mining or reclamation activities is not anticipated. <br /> 7 <br /> 10/3/19 <br />