In this paper, the inherent complexities of using cutoffs in the performance of pit optimizations for multimetal deposits are discussed. The use of a single-grade cutoff, an “equivalent-grade” cutoff and a dollar-per-ton cutoff are compared. The effects of the application of cutoffs during and after pit optimization are examined. In addition, the sensitivity of the contained resource and nondiscounted revenue to the various metal prices, recoveries and cost parameters assumed for pit optimizations are analyzed.
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