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affxo& <br />22 February 2011 <br />Mr. Mark Vanoni <br />Cripple Creek & Victor Gold Mining Company <br />Post Office Box 191 <br />100 North Third Street <br />Victor, Colorado 80860 <br />Re: Power Pole Stability Analysis <br />Dear Mr. Vanoni: <br />AMEC Earth and Environment (AMEC) has prepared this letter report for the Cripple Creek <br />& Victor Gold Mining Company (CC&V) to assess the stability of the proposed power pole <br />along the Phase 5 VLF: The power pole to be placed along the Phase 5 VLF will be used to <br />provide power to instrumentation. <br />According to the American National Standards Institute (ANSI) 05.1 (1992), a standard <br />wooden power pole will impart a maximum of 2,000 lbs of horizontal force under static and <br />live loads. To assess the stability of the VLF fall with the power pole load, a passive pressure <br />analysis was completed. A passive pressure analysis evaluates the load required to <br />maintain pole stability using a supporting wedge of soil. Figure 1 presents an illustration of <br />the passive pressure analysis applied to the power pole. <br />The passive force developed in the supporting wedge can be calculated using the <br />equations in McCarthy (1932) as: <br />? ?3[tn?45+ O)l <br />For this analysis, y is tyre unit weight of the soil (115 pounds per cubic foot), H is the depth <br />of the power pole, and 0 its the soil firkbon angle (30 degrees based on previous testing <br />completed at site). <br />/AMEC,"Earth 'Envirorrmerital, !inc. <br />:2000 S. Colorado Blvd, Suite.2-1000 <br />Denver, ,Colorado 80222 <br />61: (303)'93546505 <br />.Fax: (303)'935=6575 www.amec:com <br />n