Integration into the Strategic Planning Process The integration of commingling into Antamina's mine planning follows a structured methodological approach that places tailings management with waste rock as central elements of decision-making. This global strategy allows for optimizing the mixture of materials from the mine to the plant, considering the operational and environmental constraints associated with the tailings storage facility. By incorporating tailings behavior in the early stages of planning, greater efficiency in resource use and better risk management are achieved. The global strategy is divided into three key axes: ● Strategy 1: Ensure Future Expansions: The first strategy focuses on maximizing tailings storage capacity for current and future needs, leveraging Antamina's mineral resource and applying advanced technology to increase TSF (Tailings Storage Facility) capacity to ensure the mine's long-term operational continuity. ● Strategy 2: Optimized footprint: The second strategy seeks to optimize the overall project footprint by balancing waste and tailings storage space. This approach aligns directly with commingling principles by maximizing efficient use of available land within the current operational footprint. ● Strategy 3: Reduce upfront CAPEX: The third strategy focuses on reducing initial CAPEX to improve key financial indicators (IRR), which directly aligns with the demonstrated economic benefits of commingling, minimizing operational costs with a nearby TSF and optimizing CAPEX timing. Figure 2 Strategic vision of mine planning approach with commingling The strategies implemented in tailings dam and waste dump management seek to maximize the operational life of the mine and optimize asset value. These decisions translate into concrete actions that address sustainability, operational efficiency, and cost reduction, ensuring continuity and long-term success of the mining operation. ● Long Life Asset: Antamina's vision as a long-life asset involves making decisions based on sustainable exploitation of its exceptional mineral resources. This includes adopting 102
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