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2-l0 <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 <br />point approximately 3,000 feet to the northeast where it splits into two distinct beds. As is <br />common throughout most of the leased area, the lower seam remains the thicker of the two, <br />twelve vs five feet. When mining in areas of the Total Cameo the upper portion of the seam is <br />generally the preferred horizon to mine. Where the seam is split, the upper seam will be <br />mined most of the time because of its quality. The lower seam will be mined where the <br />interburden between the upper and lower seam is greater than 50 feet in thickness. Mining <br />of the Power split only or mining of both the upper and lower splits will require the necessary <br />permit modifications. The viability of mining the upper split of the Cameo seam is discussed <br />in Section 2.1-6. <br />As mining progresses east to the property boundary, it is expected that the seam will <br />split. Generally along the eastern permit boundary, both seams are approximately nine feet <br />thick. As the northern permit boundary is approached the upper seam may split into two <br />separate seams while the lower seam varies between 17 and 25 feet thick. To the south <br />evidence suggests that mining is limited only by the extent of burn adjacent along the <br />outcrop. A total of approximately 36,858,100 minable tons of coal are estimated in the <br />Cameo Seam within the permit boundary. <br />Table 2.1-3 illustrates drilling results in the four surface holes drilled in the graben as <br />well as in three holes drilled adjacent to the graben. The table also illustrates the four <br />distinct coal zones which occur in the McClane Graben. <br />McClane Volume 1 February, 2002 <br />