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' Tailings Pond N • • <br />Sunnyside Mine <br />i , Silverton, Colorado <br />Project No. 3120K114 <br />' transition zone between tailings types, consisted of <br />interfingered sands and clayey silts and exhibited similar <br />' properties discussed above. <br />' The natural gravels and clays below the tailings are <br /> anticipated to have properties of none to low cohesion, and <br />' moderate to moderately high angles of internal friction. <br />' Based on results of laboratory testing, our experience with <br />similar materials, and data obtained from previous reports from <br />other projects at the site, the following properties were <br />' assigned to the materials comprising the tailings pond, and the <br />natural soils underneath the tailings: <br />' Sand Tailings <br />' Dry Unit Weight - 103 pcf <br />Angle of internal friction - 34° <br />' Cohesion - 0 psf <br />Slime Tailing <br />Dry Unit Weight - 83 pcf <br />Angle of internal friction 180 <br />' Cohesion - 0 psf <br />' Natural Gravels and Clays <br />Dry Unit Weight - 130 pcf <br />' Angle of internal friction 45° <br />Cohesion - 0 psf <br />' SLOPE STABILITY ANALYSIS <br />t The static and pseudo-static (seismic) stability of the: <br />existing northeast pond slope was analyzed using strength <br />' -6- <br />