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Technical Memorandum ■ <br /> CC&V High Grade Mill Complex ■ <br /> Concentrate Stockpile Stability Analysis <br /> NewFields Job No.475.0106.015 <br /> March 8,2017 <br /> operating seismic event. Minimum acceptable factors of safety for static and pseudostatic <br /> conditions were established as 1.25 and 1.1, respectively. <br /> 2.1 Material Properties <br /> Material properties used for the stability evaluation are summarized in Table 1. The <br /> overburden and composite liner material characteristics were developed from existing data and <br /> review of the record of construction reports'. Select structural fill was assumed as the material <br /> of choice in the proposed grading. The strength values utilized for the structural fill are based <br /> on previous experience. <br /> TABLE 1—MATERIAL PROPERTIES <br /> Moist Unit Woight Fdodon Angie Cohesion <br /> Material <br /> (Iblft') degrees) (lb/ft) <br /> Select Structural Fill 125 39 0 <br /> Composite Liner 120 18 0 <br /> Existing Overburden 125 39 0 <br /> 2.2 Model Development <br /> Stability was analyzed for two sections adjacent to the High Grade Mill complex, as shown in <br /> Figure 1. Section A and Section B were selected along the west and south slopes of the Mill <br /> complex, respectively. The stability sections were chosen where the proposed fill was thickest <br /> and native ground slopes were steepest. Base grades for the cross sections were developed <br /> from an aerial flyover survey performed by CC&V in 2016 after construction of the mill <br /> platform. <br /> Based on the topography provided by CC&V, the existing overall slope of the Squaw Gulch <br /> Valley Leach Facility is approximately 2HAV in the area of Section A and 2.SH:1V in the area of <br /> Section B. The proposed fill grading for the current project has an approximate slope of 2H:1V. <br /> Subsurface stratigraphy of the foundation soils was developed from previous stability models <br /> and from as-built construction drawings from the Mill Platform. <br /> 1 AMEC,(2011).Squaw Gulch Overburden Storage Area Including Mill Platform Stability Evaluation,Cripple Creek& <br /> Victor Gold Mining Company,January 5. <br /> Page 2 <br />