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THE TRANSITION FROM OPEN PIT TO UNDERGROUND MINING: AN UNUSUAL SLOPE FAILURE MECHANISM AT PALABORA (2006)

At the Palabora Mine, the transition to caving 400 m below the bottom of the 800 m deep pit resulted in a slope failure of the North wall that began in 2003, and is still mobile. This failure can be explained by the daylighting into the cave zone of a prominent joint set. The failure was modelled by the 3-dimensional code 3DEC, which is capable of modelling the nonlinear behaviour of discontinuum materials with large displacement.
Reference:
The South African Institute of Mining and Metallurgy, International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering
Organization:
Itasca
Canada
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