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DEFINITION OF TERMS <br />South of Divide Mining Area.* The mining area encompasses the E -seam longwall panels <br />located primarily in Sections 32, 33, and 34 of Township 13 South, Range 90 West of the 6th <br />Principal Meridian, and Sections 3, 4, and 5 of Township 14 South, Range 90 West of the 6th <br />Principal Meridian. The panels are identified as E1 through E9. <br />South of Divide Permit Revision Area.* The permit revision area is the regulatory boundary <br />being added to the mine permit as shown in Figure 1. <br />Dry Fork Mining Area.* The mining area encompasses the extension of the E -seam longwall <br />panels from the South of Divide Mining Area into the Dry Fork Mining Area. The area is <br />located primarily in Section 35 of Township 13 South, Range 90 West of the 6 Principal <br />Meridian and Sections 1 and 2 of Township 14 South, Range 90 West of the 6 Principal <br />meridian. The panels are identified as E2 through E6. <br />Dry Fork Permit Revision Area.* The permit revision area is the regulatory boundary being <br />added to the mine permit as shown in Figure 1. <br />Critical Mining Width. The width of a mining panel necessary for maximum subsidence to <br />occur; the length of the panel must also be greater than, or equal to, critical panel width for <br />maximum subsidence to occur. Critical width (W c ,) commonly ranges from 1.0 to 1.4 times the <br />mining depth (d). <br />Subcritical Mining Width. The width of a mining panel less than critical width (i.e., less than <br />1.0 to 1.4d). <br />Supercritical Mining Width. The width of a mining panel greater than critical width. <br />* The focus of Exhibit 60E is on the South of Divide and Dry Fork Mining Areas. It is not <br />feasible to quantify subsidence by reference strictly to the permit revision area; to the contrary, <br />it is necessary to evaluate the relevant panels in their entirety. <br />0 <br />V <br />