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Exhibit 60C <br />Subsidence Evaluation and 2004 Geologic Hazard Field Observations <br />West Flatiron Lease Area <br />• <br />3.0 INTRODUCTION <br />This report documents the geologic observations made in the field during July 12 through 16, <br />2004, and the geologic and topographic observations made on aerial photographs. This report <br />also evaluates and provides an estimate of subsidence parameters expected for the West Flatiron <br />Lease area, based on the geologic and topographic conditions observed. The subsidence <br />parameters used in the evaluation of the lease is based on subsidence measurements and <br />observations For the West Elk Mine Subsidence Network and the Apache Rocks and Box Canyon <br />mining areas. This subsidence data is documented in Exhibit 60 of the permit. <br /> <br /> <br />83i-032.650 Wright Water Engineers, Inc. Page 4 <br />November 2004 <br />