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FoS Ranges <=1.00 >1.00<=1.20 >1.20<=1.40 >1.40 <br /> Material Keys <br /> 1'.overburden <br /> 2'.Sand and Gravel <br /> 80 3'.Residual Claystone <br /> 4'.Unweathered Claystone <br /> 60 <br /> 40 Excelsior Ditch <br /> 20 — —— <br /> 0.5:1 Highwall i <br /> 0 — <br /> -20 <br /> -40 Analysis 1 <br /> Multiple Stability Analysis <br /> Method: Bishop Simplified <br /> Surface: Circular <br /> -60 <br /> 0 20 40 60 80 100 120 140 160 180 Results <br /> GALENA v zz Critical Factor of Safety: 1.70 <br /> Project Thunderbird Mine/Excelsior Ditch no slurry wall <br /> Seismic Emtad 15 Feb 20233 Pmca—d 15 Feb 2023 <br /> File:J'.Wartln Marietta-310\310.004 Thunderbird Pueblo County\Stablllty Analysislno SWexcelsior ditch 3 seismlc.gmf Civil Resources <br />