Mangoola Coal Operations, located in the Hunter Valley, is a major open-cut mining operation committed to responsible resource management and progressive rehabilitation. As part of its closure planning, the site required a comprehensive capping solution for two decommissioned tailings dams: TD1, with a capacity of 3,400 ML, and TD2, with a capacity of 3,900 ML. The Stage 2 capping works covered an area of approximately 222,000 m2.