Strength of a mine pillar at Copper Cliff South Mine

Yates, 1948, Structural geology of Canadian ore deposits, 596 Bieniawski, 1976, Rock mass classification in rock engineering, Vol 1, 97 Barton, 1974, Engineering classification of rock masses for the design of tunnel support, Rock Mechanics, 6, 189, 10.1007/BF01239496 Hoek, 1980, Underground Excavations in Rock, 527 Priest, 1976, Discontinuity spacings in rock, Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 14, 133 Obert, 1967, Rock Mechanics and the Design of Structures in Rock, 650 Worotnicki, 1976, Triaxial ‘hollow inclusion’ gauges for determination of rock stresses in situ, 1 Anon., Field manual for CSIRO hollow inclusion gauge. Geocon. Inc., West Lebanon, NH 03784. Herget, 1980, Regional stresses in the Canadian shield, Vol. 22, 9