Stage 5 – Monitoring Implementation and Performance Evaluation
Implement monitoring and management measures to verify seepage behaviour, compare observed conditions against predictions, and evaluate system performance to support ongoing refinement of the conceptual understanding and seepage management approach defined in stage 4. The seepage management at this stage of the Project, Stage 1, is focused on closing the key knowledge gaps identified, particularly those influencing confidence in predicted seepage pathways, magnitudes, and receptor connectivity. This is achieved through the design of targeted field investigations and groundwater monitoring programs aimed to provide the data required to test and validate the hydrogeological conceptual model and supporting future numerical simulations. As new geological, hydrogeological, and monitoring information becomes available, the conceptual hydrogeological model modelling outcomes will be progressively reviewed and updated, allowing seepage risks to be reassessed and management measures refined.
3.1
Roles and responsibilities
Heritage Minerals, as the mine operator, has overall accountability for the implementation, governance, and periodic review of this SMP, ensuring that seepage risks associated with the UMG TSF are identified, monitored, and managed in accordance with regulatory requirements, design intent, and project commitments. The implementation of the SMP is supported by nominated site personnel and suitably qualified technical specialists, including hydrogeological and environmental advisors, who are responsible for maintaining the seepage monitoring network, reviewing and interpreting monitoring data, assessing system performance against defined objectives, and recommending corrective or adaptive management actions where required. Senior management within Heritage Minerals is responsible for resourcing SMP implementation, endorsing updates to the plan, and ensuring timely communication with regulators and relevant stakeholders.
Project No PS213278 Mount Morgan Mine - Upper Mundic Gully TSF Seepage Management Plan Heritage Minerals
WSP May 2026 Page 7
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