Recent legislation provides comprehensive closure regulations in Peru. The conceptual closure plan for the Antamina Cu/Zn mine, developed initially as part of the EIA, was updated to meet the new requirements. This included predicting future water quality, based on site operational monitoring data and large scale field kinetic tests, as the basis for design of a water treatment system. Cost estimates for water treatment, facility demolition and waste dump reclamation, etc., were prepared. This case study outlines the key components of the new legislation and illustrates the importance of designing and developing a mine with the ultimate closure in mind.
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