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GALENA <br />60 <br />40- <br />20 <br />0 <br />-2U <br />-40 <br />-60 1 <br />-80 <br />-100 <br />3000 <br />Overburden <br />Sand and Gravel <br />Weathered Bedrock <br />Bedrock <br /> <br />-80 -60 -40 -20 0 20 40 60 80 <br />Project: Riverview Resource Pit, Permit M-1999-098 <br />Taller Highwall, 75 foot minimum setback <br />File: C:lgalena filestmodel fileslRiverview.gmf <br />Analysis: 1 <br />Single Stability Analysis <br />Method Bishop Simplified <br />Surface. Circular <br />Results <br />Factor of Safety: 1.24 <br />100 120 140 160 <br />Edded 11 Mar 2009 Processed 11 Mar 2009 <br />Office of Surface Mining