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<br />' San Luis Mine Phase II, Raise 2 Design Repon <br />' In terms of undrained (total stress) shear strength, the tailings slimes exhibited a friction angle of <br />16 degrees and cohesion of 317 psf at 5 percent strain. At 10 percent strain, the slimes exhibited <br />a total stress friction angle of 18.5 degrees and a cohesion of 605 psf. This material exhibited a <br />' total stress friction angle of 20.5 degrees and a cohesion of 1022 psf at peak sheaz strength. These <br />test results are also included in Appendix D. <br />' The original design analyses presented in the Amendment utilized a conservative effective friction <br />angle of 28 degrees and no cohesion for the tailings for lack of actual tailings to test. <br /> <br />Ll <br /> <br />1 <br />1. <br />1 <br /> <br /> <br /> <br />1 <br /> <br />1 <br />u y 2-9 o~ect o. <br /> <br />