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GALENA Slone Stability Analysis—Vertical His!hwall <br /> The data shown on the attached GALENA slope stability analysis readout found a variety of <br /> failure slopes for a vertical highwall (modeled as near vertical in GALENA). Two rounds of <br /> slope stability analysis using Bishop's Method of Slices were conducted under varying failure <br /> circles. This process found a variety of Factors of Safety for the modeled slope. <br /> 1. Model Inputs <br /> The material used for the analysis was Sand and gravel, mixed grain size, with the following <br /> parameters: <br /> Angle of Friction ,. <br /> 45 0 110 <br /> The slope was modelled entirely in this material. The slope was a near vertical highwall <br /> (IH:I2V). <br /> All GALENA inputs are in Imperial units and the slope is modelled in feet. <br /> 2. Factors of Safety <br /> Given the vertical nature of the highwall, and the angle of friction, it is expected that the slope <br /> will have a very low minimum Factor of Safety. However,the purpose of this analysis is to <br /> determine the failure slope at a FOS of 1.5 in order to show that setbacks are sufficient. A FOS <br /> of 1.503 was calculated for a failure circle centered at(106.87, 6976.70) with a radius of 19.00. <br /> It intersected the slope surface a X-Left= 89.09. The highwall crest is located at X=100. The <br /> failure circle is thus roughly I 1 feet from the highwall crest. <br /> 1. �. <br /> •�` •Y�yh a��1 <br /> • 'L <br /> 04715 i <br /> O �r Og1(A ••fV^ •''gyp <br /> Robinson Pit No. 1 5 `- <br />