Figure 3 Decision Tree for Long-Term Strategic Scenario Planning Evaluation of Operational Parameters and Modifications by Commingling Key operational parameters—including waste rock-tailings ratio, mixing methods, transport systems, and processing criteria—are assessed for their impact on commingled system efficiency. The evaluation considers site-specific challenges such as extreme Andean weather, high-altitude logistics, and Peruvian regulations, all of which are especially critical at Antamina and require customized commingling solutions. ● Modifications to tailings management by commingling: The commingling process fundamentally transforms tailings management by utilizing voids within waste rock for storage, with available space typically equivalent to about 20% of the crushed rock volume transported by conveyors. To enable mixing, tailings must first be dewatered. The following image shows both the current process (without mechanization) and the transformation that occurs when commingling is incorporated. 105
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