Supporting Technical Assessments

1.88 Distance 200 300 400 500 600 700 800 900 Elevation 30 50 70 90 110 130 150 170 Color Name Model Unit Weight (kN/m³) Strength Function Efective Cohesion (kPa) Efective Friction Angle(°) Phi-B (°) Piezometric Line Ru Include Ruin PWP Drnd Ash/CWRock/Resid.S Mohr-Coulomb 17 0 26 0 1 0.1 Yes DrndEW/VWRhy. EWIgn&Dac. Shear/NormalFn. 17.5 EW/VWRhy. EWIgn.Dac. 0 1 0.1 Yes DrndSPZoneD2 Shear/NormalFn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 0 1 0.05 Yes DrndSPZoneD3 Mohr-Coulomb 19 5 31 0 1 0.4 Yes DrndSPZoneE Mohr-Coulomb 19 0 26 0 1 0.6 Yes DrndVWDacite Shear/NormalFn. 18 VWDacite 0 1 No DrndWDacite Shear/NormalFn. 25 WeakRhy. Dac. 0 1 No DrndWRhyRock Shear/NormalFn. 18.5 WeakRhy. Dac. 0 1 No DrndZoneA/ IFdt nUC Mohr-Coulomb 17.5 3 31 0 1 0.3 Yes DrndZoneA/ IMine OB Mohr-Coulomb 20.5 5 35 0 1 0.1 Yes DrndZoneF Shear/NormalFn. 20.5 Grav./Cobb. Dr=0.85 (16%ile) 0 1 0.05 Yes DrndZoneG Mohr-Coulomb 20.5 3 31 0 1 0.1 Yes 20.482 m 42.395 m 146.3 m 11.3 m 20.528 m 54.316 m 47.043 m Factor of Safety 1.88 - 1.98 1.98 - 2.08 ≥ 2.08 13/10/2021 Section 2a.gsz Figure B21a North Slope Drnd 1:4,000 By: ET Analysis Settings Method: Morgenstern-Price Direction of movement: Left to Right Slip Surface Option: Entry and Exit Unit Weight of Water: 9.807 kN/m³ Horz Seismic Coef.: Factor of Safety: 1.88 Color Name Model Unit Weight (kN/m³) Strength Function Effective Cohesion (kPa) Effective Friction Angle (°) Piezometric Line Ru Include Ru in PWP Drnd Ash/CWRock/Resid.S Mohr-Coulomb 17 0 26 1 0.1 Yes Drnd EW/VW Rhy. EW Ign&Dac. Shear/Normal Fn. 17.5 EW/VW Rhy. EW Ign. Dac. 1 0.1 Yes Drnd SP Zone D2 Shear/Normal Fn. 19.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes Drnd SP Zone D3 Mohr-Coulomb 19 5 31 1 0.4 Yes Drnd SP Zone E Mohr-Coulomb 19 0 26 1 0.6 Yes Drnd VW Dacite Shear/Normal Fn. 18 VW Dacite 1 No Drnd W Dacite Shear/Normal Fn. 25 Weak Rhy. Dac. 1 No Drnd W Rhy Rock Shear/Normal Fn. 18.5 Weak Rhy. Dac. 1 No Drnd Zone A/I Fdtn UC Mohr-Coulomb 17.5 3 31 1 0.3 Yes Drnd Zone A/I Mine OB Mohr-Coulomb 20.5 5 35 1 0.1 Yes Drnd Zone F Shear/Normal Fn. 20.5 Grav./Cobb. Dr=0.85 (16%ile) 1 0.05 Yes Drnd Zone G Mohr-Coulomb 20.5 3 31 1 0.1 Yes

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