The challenge was not merely technical, but institutional: the existing operational framework lacked coordination mechanisms and efficient allocation instruments capable of reconciling energy generation, mining expansion, urban water supply, and agricultural use without triggering distributive conflicts and social risks. 2.3 Governance Challenge: Enabling Public-Private Cooperation The primary challenge was not technical, but one of governance. There was no specific legal framework in place to structure a water-related Public-Private Partnership under a shared financing scheme. It was necessary to secure a Supreme Decree signed by three Ministers of State, which prioritized the productive use of the regulated resource and enabled Cerro Verde to finance 40% of the investment. This institutional arrangement transformed a potential competition over water into a cooperative model of shared value creation. Following Pillones, additional water infrastructure projects were made possible: Chalhuanca (26 Mm³), Bamputañe (40 Mm³), San José de Uzuña (10 Mm³), the La Tomilla II drinking water plant, and the La Enlozada wastewater treatment plant. Thus, the Virtuous Water Circle was born. 2.4 Financial Structure and Social Foundation The Pillones Project had a total cost of USD 20 million, was constructed between 2002 and 2006, and was financed 60% by EGASA and 40% by Cerro Verde. Beyond the financing structure, the decisive element was a strategic territorial development agreement. Through a process of continuous dialogue and community participation, local communities facilitated land access and their voluntary resettlement in exchange for new infrastructure built with durable materials and equipped with basic services that had previously been unavailable, including electricity, potable water, and sewerage systems. The new housing, together with a church, community center, school, and complementary facilities, established a solid foundation of trust and social legitimacy for the project. 3. THE VIRTUOUS WATER CIRCLE: PILLONES AS A CATALYST The “Virtuous Water Circle” did not emerge spontaneously nor as the result of multiple independent projects. It was activated by the construction of the Pillones Dam, which acted as enabling infrastructure and a systemic catalyst for regional water development. Pillones represented a turning point that transformed a context of scarcity and competition over water resources into a platform for coordinated expansion. Following its implementation, the technical, institutional, and financial conditions were established to allow the progressive incorporation of new reservoirs—Bamputañe (40 Mm³), Chalhuanca (26 Mm³), and San José de 5
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