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1 <br />' San Luis Mine Phase li, Raise 2 Design Repon <br />' 1.3 Scope of Work <br />In order to confirm the viability of the conceptual embankment raise design a series of investigations <br />' were conducted to supplement existing data and define the physical characteristics of the tailings <br />which will underlie the raise. These investigations included work to determine insitu tailings <br />' density, a series of sixteen cone penetrometer test (CPT) probes, three auger borings, piezometer <br />readings, and laboratory testing. Testing conducted for Raise 2 verification was similar to that <br />conducted and accepted for Raise 1 although the Raise 2 testwork was more extensive. The results <br />' of this test work will be described in detail in the following section. <br />' The results of the tailings investigations were incorporated into the model of fate structure. This <br />refined embankment model was utilized to evaluate the raise stability under static and dynamic <br />earthquake loading conditions. In order to evaluate stability of the raise structure under dynamic <br />' loading conditions, pseudostatic stability analyses as presented in the Amendment and Newmazk <br />(1965) type deformation analyses were conducted. Pseudostatic stability analyses incorporated a <br />' seismic coefficient of 15 percent of gravity (O.15g) as presented in Section D.1 of the Amendment. <br />Dynamic loading for the deformation analyses consisted of the maximum credible earthquake (MCE) <br />ground motion as defined in Appendix B of the Permit. <br />' SRK was also requested to prepare the technical specifications and design drawings for the raise <br />_ construction which are included in this report. <br />1 , <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />u y 1-2 ro~ect o. <br /> <br />