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Mountain Coal Company, L.L.C. Exhibit 5l <br />West Elk Mine ~ Lower Refuse Pile <br />• <br /> <br />• <br />Table 1 -Storage Capacity By Phases (cubic yards) <br />Phase Phase Volume Cumulative Volume <br />I 355,245 355,245 <br />II I O 1,723 456.245 <br />I11 ? 39.676 696.644 <br />1 V 3'_3,356 1.020,000 <br />V 360.000 1,3 80,000 <br />Table 2 -Lower Refuse Pile Life <br />Phase Capacity <br />(yd') Capacity <br />(tons)' Cumulative <br />Capacity <br />(tons) Phase <br />Life <br />(yrs)' Cumulative <br />Life <br />(yrs)' <br /> 355,245 407.644 407,644 1.8' 1.8' <br />11 101,723 116.727 5'_4,371 I.l 2.9 <br />III 239,676 275,028 799,399 2.6 5.5 <br />-V 323,356 371,051 1,170.450 12.8 15.7 <br />V 360,000 286,700 1,457,150 1.4 17.1 <br />' Assumes annual waste production of 100.000 TPY for the F seam room and pillar operations 50,000 TPY for the <br />longwal I operations (beginning in Phase I V), and ? 00,000 TPY for longwal I operations during Phase V. <br />' Assumes 85 pcf for refuse for phases 1- I V, and 59 pcf for phase V. <br />' Corrected for estimated 200.000 tons already in place prior to Phase 1. <br />2.5 Materials Balance <br />The immediate reclamation of portions of the refuse pile which have been completed and are at finished <br />grade is an important part of the design and operation of the lower refuse pile. Timely reclamation is <br />important in minimizing [he volume of topsoil and subsoil which will be required to be stockpiled. It also <br />reduces sediment loads to the existing sedimentation ponds (this will be discussed in more detail later in this <br />exhibit). A materials balance has been completed for each phase of construction. The volumes of subsoil <br />include the impacts of the relocation of S}•Ivester Gulch Road, the construction of the new access road. [he <br />construction of the underdrains, and other construction projects. The total depth of stripping is estimated to <br />be approximately4.2 fee[. Based on the phasing, the maximum amount of topsoil required to be stockpiled <br />during Phase I throueh Phase I11 was approximately 13.500 cubic yards, and for Phase IV approximately <br />13,875 cubic yards. Table 3 lists the approximate areas that will be reclaimed at the completion of each <br />phase, and the volume of topsoil and subsoil required for reclamation. The specific materials balance based <br />on this information and on anticipated stripping volumes during each phase is provided in Table 4. <br />6 <br />