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DEFINITION OF TERMS <br /> South of Divide Mining Area. The mining area encompasses the E-seam longwall panels located <br /> primarily in Sections 32, 33, and 34 of Township 13 South, Range 90 West of the 6th Principal <br /> Meridian, and Sections 3, 4, and 5 of Township 14 South, Range 90 West of the 6th Principal <br /> Meridian. The panels are identified as E1 to E9. <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 located <br /> primarily in Section 35 of Township 13 South, Range 90 West of the 6th Principal Meridian and <br /> Sections 1 and 2 of Township 14 South, Range 90 West of the 6th Principal meridian. The panels <br /> are identified as E2 to E6. <br /> Southern Panels Mining Area. The mining area includes the E-seam longwall panels originally <br /> included in the South of Divide Mining Area and some of which were extended into the Dry Fork <br /> Mining Area (El to E9, as above). The Southern Panels mining area also includes the B-seam <br /> longwall panels(B26 to B29)that will underlie Southern Panels E 1 to E5. Throughout this exhibit, <br /> this term will be used to identify what was formerly referred to as the South of Divide and Dry <br /> Fork mining areas. <br /> Apache Rocks West Mining Area. The Apache Rocks West panels refer to the three western <br /> panels in the Apache Rocks Mining Area(as defined in the original Exhibit 60),which are located <br /> in Sections 28, 29, and 30, Township 13 South, Range 90 West, of the 6th P.M. Both B- and E- <br /> seam longwall mining will occur in this area. <br /> Sunset Trail Mining Area. The mining area encompasses the E-seam longwall panels located <br /> primarily in Sections 10, 11, 14, and 15 of Township 14 South,Range 90 West of the 6th Principal <br /> Meridian. The panels are identified as SS1 through SS4. <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 x) 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 /> v <br />