This partnership aimed to conduct a multidisciplinary assessment focused on managing risks, uncertainties and opportunities, providing a sustainable closure and mitigating liabilities throughout the remaining life of the mine.
The review was based on data provided by Lundin, international best practices, and Brazilian legal and regulatory requirements. The planning process involved the redefinition of key concepts and project premises, proposing technically and socio-environmentally responsible alternatives. The strategy prioritized maximizing opportunities while minimizing environmental and social risks through an adaptive approach.
The plan includes backfilling and the formation of a pit lake, the decommissioning of geotechnical structures, the remediation of low-grade ore piles and the dismantling of industrial and administrative infrastructure. Additionally, it outlines the implementation of surface drainage systems and security and access control measures.
A risk analysis was carried out to identify post-closure residual risks, while potential future land uses were explored based on input from internal stakeholders. The study highlighted critical knowledge gaps in geochemistry, water management, and geotechnics, requiring additional studies to address such uncertainties.
Closure cost estimates have been developed with a strict focus on waste piles, tailings dams and water management. The plan also considered Asset Withdrawal Obligation (ARO) costs, with subsequent studies planned to increase the accuracy of estimates and ensure the financial sustainability of the closing process.
