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Timm Comer <br />Mill Platform Machine Vibration Effects <br />Project 74201125G <br />September, 20, 2012 <br />• <br />operation of the mill. Deep failure surfaces are not expect to be an issue as the confining stresses <br />increase with depth and therefore would require greater mobilization forces than expected from the <br />machine vibrations. <br />AMEC appreciates the opportunity to provide continued engineering and construction support to Cripple <br />Creek & Victor Gold Mining Company. If you have any questions or comments, please contact the <br />undersigned at (303) 630 -0784. <br />Sincerely, <br />AMEC Environment and Infrastructure <br />D-0,S) 0, a-" � <br />David M. Weidinger, PE. <br />Geotechnical Project Engineer <br />JNM:dmw <br />'I X6VL4_ <br />Jay. N. Janney- Moore, P.E. <br />Senior Project Engineer <br />Slprojects\1125g squaw gulch valley leach facililty design\h2 - design \mill platform machine vibration letters Sept 2012 \mill platform machine vibrations (3).doc 8 <br />