956 and risk-reduction benefits. Strengthening economic appraisal methodologies is therefore essential to enable scaling and integration into basin-level planning. In addition, climate variability reinforces the need for integrated basin-scale planning and life-cycle water system design, as extreme events can exceed historical assumptions and create long-term liabilities if hydrological dynamics are not adequately managed during operations and closure (Kennedy, 2025). Interviews indicate that basin-level reliability is a strategic priority in water-constrained mining regions where desalination or urban reuse are not feasible. Even with high recirculation rates, structural make-up water requirements persist, making shared storage, managed recharge, and selected Nature-Based Solutions — particularly high-Andean wetland restoration and infiltration systems — critical for operational continuity and social acceptance (Quiroz, personal communication, 2025). Governance and social participation. Effective water governance in mining regions is shaped not only by hydrological conditions but also by the quality of institutional coordination and stakeholder engagement. The literature shows that water insecurity often emerges from fragmented governance structures, limited cross-sector planning, and misaligned priorities among public authorities, productive sectors, and local communities (Salmoral et al., 2020). Even in basins with relatively strong institutional capacity, increasing climate variability and rising demand require adaptive, coordinated, and forward-looking governance mechanisms. Research consistently shows that sustainable water management depends on clear allocation frameworks, transparent data-sharing, and structured multi-actor platforms for joint decision-making (Megdal et al., 2017). Where governance fragmentation persists, water-related risks -including social conflict, regulatory uncertainty, and operational disruptions- tend to increase. Conversely, coordinated basinlevel approaches that integrate public authorities, mining companies, agricultural users, and civil society can enhance resilience and reduce long-term vulnerability (Torreblanca, personal communication, 2025). Empirical evidence suggests that mining-led initiatives in shared monitoring, infrastructure cofinancing, data transparency, and multi-stakeholder platforms can strengthen basin governance (IFC, 2014). These mechanisms improve environmental outcomes while reducing social and operational risks, reinforcing economic viability in water-stressed regions. Interviews confirm that disruptions often stem from institutional uncertainty rather than physical scarcity (Osores, personal communication, 2025), prompting companies to prioritize data-sharing, co-investment, and coordinated governance to mitigate conflict risk. Arequipa Case The Arequipa case provides a real-world basin-scale implementation of these principles. Through cooperation with public authorities, hydraulic infrastructure was built to increase basin storage and regulate flows, improving availability for all users. The objective was not only operational supply but systemic water security, benefiting agriculture, population and industry simultaneously. The central intervention was large-scale municipal wastewater reuse. A treatment plant processes roughly 95% of the city’s sewage, recovering river quality and public health conditions while providing a reliable industrial water source (Torreblanca, personal communication, 2025). Instead of competing with urban users, the operation relies on water that previously represented a pollution burden. This demonstrates that reuse can simultaneously solve environmental and supply constraints. The project included potable water infrastructure serving approximately 500,000 people and additional hydraulic works that expanded storage and improved basin regulation, reducing drought impacts. The same infrastructure secured operational supply, aligning public benefit with business continuity.
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