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i DEFINITION OF TERMS <br />South of Divide Mining Area.* The mining azea encompasses the E Seam longwall panels <br />located prhnarily in Sections 32, 33, and 34 of Township 13 South, Range 90 West of the 6'~ <br />Principal Meridian, and Sections 3, 4, and 5 of Township 14 South, Range 90 West of the 6a` <br />Principal Meridian. The panels aze identified as El through E9. <br />South of Diride Permit Revision Area.* The permit revision azea is the regulatory boundary <br />being 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~) 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 60B is on the South of Divide Mining Area. It is not feasible to quantify <br />subsidence by reference strictly to the permit revision area; to the contrary, it is necessary to <br />evaluate the relevant panels in their entirety. <br />n:~wm~wwe~ea~-o3z~zum~nb~~soaii-zooa~trcaoBn-zooawm-ate <br /> <br />