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<br /> <br /> <br />E~bit 60C <br />Subsidence Evaluation and 2004 Geologic Hazard Field Observations <br />West Flatiron Lease Area <br />7.1.1 Maximum Vertical Displacement (Subsidence) <br />The following range of vertical displacements (subsidence values) is projected for the West <br />Flatiron Lease area. The projected range of maximum vertical displacements, for the West <br />Flatiron Lease area and adjacent Box Canyon mining area is shown in Table 1. <br />LongwalJ Panel 18A: <br />• Maximum vertical displacement above the chain (gate road) pillars (S~) is estimated to range <br />from 1,7 to 3.8 feet. <br />• Maximum vertical displacement (subsidence, Sm) is projected to range from 6.0 to 9.6 feet <br />Longwall Panels 18 and 19: <br />• Maximum vertical displacement above the chain (gate road) pillars (SW) is estimated to range <br />from 2.2 to 6.5 feet, <br />• Maximum vertical displacement (subsidence, Sm at) is projected to range from 4.8 to 9.6 <br />feet. <br />Lonewall Panels 20 and 21: <br />• Maximum vertical displacement above the chain (gate road) pillars (S~) is estimated to Inge <br />from 2.9 to 6.5 feet. <br />• Maximum vertical displacement (subsidence Sm at) above are longwall panel centers is <br />projected to range from 4.8 to 9.0 feet. <br />831-032.650 <br />November 2004 <br />Wright Water Engineers, Ina <br />Page 13 <br />