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Factor of Safety <br /> O T f! T N •� O T T <br /> 300 <br /> O Stable slopes <br /> • Unstable slopes <br /> 250 <br /> 0 0 <br /> O <br /> 200 Critical slopes _ <br /> d <br /> E 0 <br /> 0 <br /> = 150 O\\V Design curve <br /> t O <br /> 01 <br /> t O <br /> d <br /> O O <br /> 100 <br /> 0 O <br /> O <br /> 50 <br /> O <br /> SUNNYSIDE PIT <br /> 00 <br /> 0 <br /> 30 40 50 60 70 80 85 <br /> Slope angle 'If - degrees <br /> 10 <br /> Stable slopes <br /> Number of <br /> observations 5 Unstable slopes <br /> 0-L— -4 <br /> 2.0 1.8 1.6 1.4 1.2 1.0 0.8 <br /> Factor of Safety <br /> Figure 4.2 Relationship between Slope Heights and Slope Angles for Porphyry <br /> Slopes in the Rio Tinto Area, Spain (Hoek and Bray, 1977) <br /> 14 <br />