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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 /> 2.3 Stability Evaluation Results <br /> The stability analyses resulted in acceptable minimum factor of safety values for both static and <br /> pseudostatic conditions, as shown in Table 2. The output graphics from the stability models are <br /> included as Attachment A. <br /> TABLE 2—CALCULATED FACTORS OF SAFETY <br /> Cross Section Fafilure Mode Static Stability Pseudostatic Stabiilty <br /> Factor of Safety Factor of Safety <br /> A Circular 1.5 1.1 <br /> B Circular 1.8 1.3 <br /> 3.0 DISCUSSION <br /> Results indicate that the slopes for the proposed grading plan of the Concentrate Recovery <br /> Loadout/Stockpile Area, under both static and pseudostatic conditions, are stable. Section A <br /> was identified as the most critical slope including the steepest portion of the existing slope. <br /> NewFields recommends select structural fill as the primary fill material for the proposed site <br /> grading. The material should conform to the gradation outlined below. <br /> TABLE 3—SELECT STRUCTURAL FILL GRADATION <br /> U'S, "dark p~t P400t <br /> Sieve Sloe by Dry WelSbt <br /> 3-inch 100 <br /> No.200 0-25 <br /> Plasticity Index:10 maximum <br /> Structural fill shall be compacted to 95 percent of the maximum dry density, within ±2 percent <br /> of the optimum moisture content as defined by ASTM 1557 (modified Proctor). The material <br /> shall be compacted in a maximum 12-inch thick compacted thickness. Appropriate compaction <br /> equipment (shall be used that does not damage adjacent structures (concrete, pipe, etc.)) and, <br /> at the same time, provides adequate energy to fully compact the material. <br /> Page 3 <br />