Abstract
The design of an optimum open-pit requires an estimate of a set of average and safe slope angles. Pit slope angles may vary throughout a deposit to accommodate varying rock characteristics and ore/waste ratios. If insufficient geotechnical information is available, the pit slopes may be found from other mines of similar size and geological conditions. If the mine is in operation, predefined or existing pit slopes can be used in the design of the optimum pit. Two approaches are described and associated computer programs for the estimation of a set of safe average pit slopes for use in an optimal pit design program are presented. The first approach determines the steepest safe angle by kinematic analysis; the second includes methods for the design of slopes by limit equilibrium analysis in terms of the safety factor or the probability of failure determined by application of the Monte Carlo simulation technique.
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