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Exhibit 60C <br />Subsidence Evaluation and 2004 Geologic Hazard Field Observations <br />West Flatiron Lease Area <br />• is a good example of agravity-induced crack. It was easy to determine that this was not a <br />mining-related crack because no mining had occurred in the area. The possibility of gravity- <br />induced cracking in the rugged county above planned mining activities at West Elk Mine is a <br />good reason to perform baseline studies of the area prior to mining so that these features can be <br />documented. <br />• <br /> <br />831-032.650 Wright Water Engineers, Inc. Page 9 <br />November 2004 <br />