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60 <br />50 <br />40 <br />N <br />C <br />L <br />N 30 <br />U) <br />fC <br />N <br />L <br />U) <br />20 <br />10 <br />I. .. c :. c.. 1th: W' = 34.9° (35° used in our Analysis), c' = 5.2 psi (750 psf) <br />0 <br />0 10 20 30 40 50 60 70 80 90 100 <br />Normal Stress (psi) <br />LEGEND: <br />Six strength envelopes from CNI large scale direct shear tests (12" by 12" shear box). <br />— — Values used in parametric stability analysis. <br />116]01 <br />Lower Bound Used in Analysis: �' = 30 °, c'= 0 psi <br />Adapted from: Shannon & Wilson, <br />Geotechnical Study, Up -Dip Alternative South <br />Taylor Surface Mine, Job No. 23-1-01105-500, <br />December 2008. <br />