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Total Pit Depth <br />Feet Overburden <br />Thickness Feet Pit Wall Slope <br />Horiz.: Vert. Setback <br />Feet Slope Stability <br />Safet Factor <br />60 5 0.5:1 25 0.56 <br />60 5 0.5:1 50 0.83 <br />60 5 0.5:1 75 1.13 <br />60 5 0.5:1 80 1.27 <br />60 5 1.0:1 25 0.86 <br />60 5 1.0:1 50 1.13 <br />60 5 1.0:1 75 1.39 <br />60 5 1.0:1 60 1.31 <br />60 5 2.0:1 25 1.40 <br />60 5 1.5:1 25 1.12 <br />60 5 1.5:1 50 1.41 <br />60 5 1.5:1 35 1.25 <br />Conclusion <br />The analyses presented here indicate that the proposed mining slopes will be stable with <br />a Factor of safety of 1.25 or greater under the following conditions: <br />Slope Setback <br />0.5:1 80 feet <br />1.0:1 60 feet <br />1.5:1 35 feet <br />2.0:1 25 feet <br />\\Bgserver\public\Projects By Client\Haldorson & Sons\03023-Haldorson Mine\03023_Slope Stability writeup_RMM.doc <br />