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2-10 <br />• 2.1.4.2.3 Cameo Seam <br />Current data and projections suggest that the Cameo Seam is present as either one or <br />two seams throughout the proposed mine plan area. As two separate or one total seam, the <br />Cameo is at least 17 feet thick throughout the mine plan area (See Figure 2.1.6). The Total <br />Cameo is 22 feet thick at the McClane Canyon portal and maintains this thickness until a point <br />approximately 3,000 feet to the northeast where it splits into two distinct beds. As is common <br />throughout most of the leased area, the lower seam remains the thicker of the two, twelve Vs <br />five feet. When mining in areas of the Total Cameo the upper portion of the seam is generally <br />the preferred horizon to mine. Where the seam is split, the lower seam will be mined most of <br />the time because of its areal extent, continuity and consistent nature. The viability of mining the <br />upper split of the Cameo seam is discussed in Section 2.1.6. <br />• As mining progresses east to the property boundary, it is expected that the seam will split. <br />Generally along the eastern permit boundary, both seams are approximately nine feet thick. As <br />the northern permit boundary is approached the upper seam may split into two separate seams <br />while the lower seam varies between 17 and 25 feet thick. To the south evidence suggests <br />that mining is limited only by the extent of bum adjacent along the outcrop. A total of <br />approximately 36,858,100 minable tons of coal are estimated in the Cameo Seam within the <br />permit boundary. <br />Table 2.1-3 illustrates drilling results in the four surface holes drilled in the graben as well <br />as in three holes drilled adjacent to the graben. The table also illustrates the four distinct coal <br />zones which occur in the McClane Graben. <br /> <br />Nlo Volume 1 4.29-96 <br />