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EXHIBIT 13C <br />Volume 20 Page 16 Revision Date: 4/20/23 <br /> Revision No.: MR-246 <br /> <br />Collom Pit and Temporary Spoil Pile <br /> <br />Tables 13C-23 through 13C- 27 provide the volumes of overburden, topsoil, and reseeding <br />acreage necessary to reclaim the Collom Pit box cut and out of pit stockpile area. There is <br />temporary and permanent out of pit spoil (including the Little Collom Valley Fill) associated <br />with the Collom Pit. Tables 13C-23 and 24 reflect the maximum total amount of overburdened <br />necessary to backfill and regrade the Collom Pit boxcut (not including the dragline spoils) to <br />achieve the final approved post mine topography for the Collom Pit, and they do not include the <br />permanent out of pit spoil. Please refer to Map 13C-2 for the final Collom Pit box cut and <br />temporary out of pit stockpile configurations which reflect the locations associated with the <br />volumes presented in Tables 13C-23 and 24. Please refer to Map 13C-1 which reflects the use <br />the dragline in the Collom Pit and provides the total regrade volumes for the dragline are <br />presented on Table 13C-31. <br /> <br />Table 13C-23 Collom Pit Backfill* <br />Area Cut (Cubic <br />Yards) <br />Collom Pit 6,608,464 <br /> *Please see to Map 13C-2 <br /> <br />Table 13C-24 Temporary Spoil Pile Removal <br />Area Total (Cubic <br />Yards) <br />Haul Distance <br />(feet) <br />Average Grade <br />(%) <br />Temporary Spoil Pile 6,608,464 4,244 3.8 <br /> <br /> <br />Table 13C-25 Collom Pit and Temporary Spoil Pile Topsoil <br />Area Acres <br />Disturbed <br />Topsoil Replacement <br />Volume (Cubic <br />Yards) <br />Haul Distance <br />(feet) <br />Average <br />Grade (%) <br />Collom Pit & <br />Temporary Spoil <br />Pile <br />684.4 1,412,134 5,144 3