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Subsidence and Geologic Field Observations <br />Apache Rocks and Box Canyon Mining Areas <br />July 12-15, 2004 <br />longwall panels 21 and 23 are mined. Tilt and strain related to mining is estimated to be a <br />greater causal factor than the small earth tremors that are caused by stresses and strains produced <br />in the mining process. <br />D:\WOrk\W WE1631A32K40ha\2p14 ARBC Subsiderce ReporLdoc <br />831-032.640 Wright Water Engineers, Inc. Page 48 <br />' September 2004 <br />