Laserfiche WebLink
0 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 6thPrincipal <br />Meridian, and Sections 3, 4, and 5 of Township 14 South, Range 90 West of the 6thPrincipal <br />Meridian. The panels are identified as E1 through E9. <br />South of Divide Permit Revision Area.* The permit revision area is the regulatory boundary being <br />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 located <br />primarily in Section 35 of Township 13 South, Range 90 West of the 6th Principal Meridian and <br />Section 2 of Township 14 South, Range 90 West of the 6th Principal meridian. The panels are <br />identified as E2 through E6. <br />Dry Fork Permit Revision Area.* The permit revision area is the regulatory boundary being added <br />to the mine permit as shown in Figure 1. <br />Critical Mining Width. The width of a mining panel necessary for maximum subsidence to occur; <br />the length of the panel must also be greater than, or equal to, critical panel width for maximum <br />subsidence to occur. Critical width (Wcr) commonly ranges from 1.0 to 1.4 times the mining depth <br />(d). <br />Subcritical Mining Width. The width of a mining panel less than critical width (i.e., less than 1.0 to <br />1.4d). <br />is 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 feasible to <br />quantify subsidence by reference strictly to the permit revision area; to the contrary, it is necessary <br />to evaluate the relevant panels in their entirety. <br />• <br />Tetra tech - 0807171 V11