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CONFIDENTIAL INFORMATION <br />ESTIMATE OF COAL RESERVE BASE, <br />MINEABLE RESERVE BASE, AND RECOVERABLE RESERVES <br />WITHIN THE CAMEO C SEAM <br />This section presents the method used to calculate the three categories <br />of reserves in the Cameo C seam mining area of the Roadside North Mine. The <br />reserve tables reflect the categories by each Federal lease. <br />The in place coal reserve base and the mineable reserves for the Cameo <br />C seam mining area of the Roadside North Mine were determined using coal <br />thickness isopachs and areas. T he coal thickness isopachs and other geologic <br />maps were drawn using core hole and channel sample information in <br />Rockware's Gridzo geologic software. Reserves were then generated for each <br />Section and Lease within the Cameo C seam mining area of the Roadside North <br />Mine. Table 5.1A shows the in place coal reserve base. <br />The mineable reserve base was calculated using seam thickness and <br />associated areas. The 100 foot barrier on the lease boundary and the areas <br />outside of the projected Cameo C seam mining area boundary adjacent to <br />Cameo B seam workings or over the projected Cameo B seam southwest mains <br />were excluded. Mineable reserves are on a raw basis using 1890 tons per acre <br />foot. Table 5.1A shows the mineable reserves. <br />The recoverable reserves for the Cameo C seam mining area of the <br />Roadside North Mine were calculated using seam thickness data and <br />calculated mining recoveries for various main and pillar section layouts. Mining <br />recoveries (not including barrier pillars) ranged from 43 percent in main <br />entries to 73 percent in panels with pillar recovery. The overall mining <br />recovery is estimated to be 34 percent. The mine plan map indicates the entry <br />• and crosscut centers for various areas of the mine. Table 5.1A shows the <br />recoverable reserves. <br />PHCC R2P2 Page 9 2-28-99 <br />