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Tailings Pond N • • <br />Sunnyside Mine <br />1 Silverton, Colorado <br />Project No. 3120K114 <br />t proposed 2:1 slope configuration proposed for reclamation <br />purposes. Cross-section 3 was also analyzed with simulation of <br />' the placement of an additional 15 feet of tailings at the top <br />of the pond. Effective stress analyses, utilizing the material <br />' strengths previously discussed and the location of the phreatic <br />surface in the pond were conducted for both static and <br />' pseudo-static cases. The following table presents the results <br />of the stability analyses: <br />' Existing and Proposed Configurations <br />' Static Pseudo-Static <br /> Cross-Section Analysis Analvs~ <br /> Section 3 (existing) 1.24 1.06 <br /> Reclamated <br /> 2:1 slope 1.55 1.25 <br />Section 5 (existing) 1.38 1.17 <br />Z:1 Slope 1.59 1.29 <br />Proposed Configuration 15 Feet Fill <br />' Additional Fill 1.54 1.25 <br />2:1 Slope 3 1.62 1.30 <br />' CONCLUSIONS <br />' The concept of a factor of safety is a derived value, and not <br />an intrinsic property of a slope. The accuracy with which the <br />' factor of safety for a given slope can be determined is based <br />on a number of factors, the most significant of which are <br />' listed below: <br />o Variability in surface conditions <br />o Variability and type of subsurface conditions <br />' o Validity of the analytical method <br />o Validity of simplifying assumptions <br />-8- <br />