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Mr.Timm Comer <br /> Manager,Environmental Resources ameO <br /> Hydro-JexTM Program Review <br /> December 17,2009 <br /> The predicted hydraulic results were then used to run a stability analysis through the ore section for this <br /> scenario. The results of the stability analysis are presented in Figure 6, and indicate a FOS of 1.60 under <br /> the shallow injection scenario. <br /> Safety _actor <br /> 0.00 <br /> 0.25 <br /> 0.50 <br /> 0.75 <br /> 1.00 <br /> 1.25 <br /> 1.SO <br /> 1.75 <br /> 2.00 <br /> 2.25 <br /> 2.50 <br /> 2.75 <br /> 3.00 <br /> 3.25 <br /> 3.50 <br /> 3.75 <br /> '.00 <br /> 4.25 <br /> 7 5.00 <br /> 5.50 <br /> T - 1.8-0 <br /> 11500 a 20o0 42500 43000 - I350 --00.-----r- -l�-i-0, --, <br /> __ 4 <br /> Figure 6 Shallow Injection Stability Analysis <br /> Figures 7 and 8 present the pressure profile and the extent of saturation for injection at the 9852 <br /> elevation, under a full injection pressure scenario (near the overburden pressure). As shown, the extent of <br /> saturation approaches the face of the ore slope, even at this modest depth. The stability analysis for this <br /> scenario is presented in Figure 9, which indicates a FOS of 1.39, which is below the VLF design criteria of <br /> 1.50. <br /> To assess what affect the injection pressure may have on the extent of saturation and stability, the <br /> injection pressure for this scenario was decreased to one-half of the overburden pressure. Figure 10 <br /> presents the extent of saturation resulting from the reduced injection pressure. Figure 11 presents the <br /> stability analysis for this scenario, indicating an FOS of 1.62 due to the lowered injection pressure, which <br /> meets the VLF design criteria for acceptable factor of safety. <br /> S\PROJECTSN 125E CCV CQA\e-correspondence\hydro jex letter.doc 5 <br />