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Exhibit 60C <br />Subsidence Evaluation and 2004 Geologic Hazard Flold Observallona <br />West Flatiron Lease Area <br />• <br />8.1 Location 1 <br />Location I is about 1,200 feet west of the western boundary of the Wcst Flatiron Lease: area and <br />about 500 feet north of its southern boundary. The point is located above the barrier pillar <br />be;ttvicen mined longwall panel 22 and un-mined longwall panel 21. It is located near the cast rim <br />of West Flatiron ul the top of the Ohio Creek Member o(the 1\lesaverdc Formation t Flap l ). <br />The estimated natural rockfall potential in the cliff urea is locally high for the upper 200 to 3W <br />feet on the west side of the Wcst Flatiron Lease area, and moderate fur the Icss steep slopes <br />below cliffs and ledges (Figum 3). <br />• <br />Figure 3. Northward view agony tho east-lacing cii!ts of West Flatiron from Location 1. The left edge of <br />image is the approximate boundary of Ine West Flatiron Lease area to the east and the Box Canyon <br />mining area to the west. The rocklall potential is high where rocks have loosened up along joints and <br />Iractures (as the perched rocks .n the right middle ground). <br />• <br />831.032.650 W nght W afar Engmeors. Ino Pege 19 <br />Novembor2004 <br />