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<br />horizontal tensile strains could result in development of surface cracks in the vicinity of the mining <br />section. <br />TABLE 1113 <br />PHYSICAL TEST RESULTS <br />• <br />MINE OR FORMATION ANGLE OF <br />INTERNAL <br />FRICTION (~) COHESION <br />(c) REFERENCE <br />Lower Fort Union Formation 29.6° 404 psi Fahy & Smith, 1976 <br />Decker Mine 35.0° 850 psi Lee, Smith & Savage, 1976 <br />Hanna, Seam 82 36.2° 448 psi Dravo, 1975 <br />York Canyon Seam 48.7° 315 psi Atkinson-Noland & Assoc., <br />1976 <br />York Canyon Seam 46.0° 332 psi Gentry, 1976 <br />Beehive Mine, UT 35.7° 1016 psi McGovern & Ko, 1976 <br />AVERAGES 38.5° 560 psi <br />• Midterm Review (8/2002) III-15 <br />