2240 Figure 143 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 advanced technologies, such as commingling, to improve storage capacity and ensure operational continuity until 2036 and beyond, thus maximizing the value of the mineral resource. • Reduce Environmental Social Footprint: The strategic approach prioritizes reducing environmental and social impact through operation within the current footprint, increasing water availability through filtration, optimizing space use, and minimizing risks associated with tailings dams. Commingling contributes not only to technical and economic efficiency but also to sustainability objectives and corporate social responsibility. • Reduce Capital and Operational Cost: The cost reduction strategy focuses on optimizing capital investments (CAPEX) and their schedule, as well as minimizing operational costs through strategic facility location and leveraging synergies to avoid duplicate infrastructure. This enables more efficient and profitable resource management. During the strategic planning phase, conceptual foundations for commingling implementation are established, including site characterization, regulatory framework development, and technical-economic feasibility analysis. 4. ANALYSIS OF THE MINING SYSTEM WITH COMMINGLING APPLICATION Methodological Process Structure The methodological process is organized in sequential stages that ensure effective integration of commingling into mine planning: • Comprehensive material evaluation: Detailed analysis of geotechnical and geochemical characteristics of available materials, identifying their suitability for mixtures and joint disposal. • Mixture design development: Design of optimized mixtures that maximize desired properties of commingled material, such as low permeability and high stability, minimizing acid water generation and improving mechanical behavior of the deposit. • Pilot test implementation: Execution of pilot and industrial scale tests to validate mixture performance and adjust design parameters according to results obtained under real operating conditions.
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