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1.0 INTRODUCTION <br /> This report presents a limited stability evaluation of the final pit plan for mining of <br /> surface exposures of the Sunnyside vein in the Sunnyside Basin near Silverton in San <br /> Juan County, Colorado. Mining plans were developed by the staff at the Sunnyside <br /> Mine. Review of the plans and development of geologic data was initiated after <br /> completion of the first bench. <br /> This assessment is based upon limited structural geologic data developed by the <br /> Sunnyside geologic staff, with technical definition provided by J. F. T. Agapito & <br /> Associates, Inc. (JFTA). JFTA personnel visited the site on two separate occasions to <br /> observe the geologic environment, inspect rock quality and structure, and to ground truth <br /> rock structural mapping performed by the Sunnyside staff. <br /> The pit is relatively limited in size with the maximum highwall reaching a height of <br /> 120 feet. Benches were planned at intervals between 20 and 33 ft with face angles of <br /> 70°. Safety benches were planned to be 12 ft wide, which produced a composite slope <br /> angle of 56°. <br /> This report is presented in four sections. Sections 1.0 and 2.0 are the introduction <br /> and conclusions/recommendations, respectively. Section 3.0 presents the geology and <br /> rock structural data available for the area. Section 4.0 examines stability impacts of <br /> geologic structure and the global stability of the pit configuration. <br /> 1 <br />