To ensure effective subsidence management, we conduct regular risk assessments and update the subsidence management plan as part of routine operations. The regular monitoring had been conducted using a network of surface crack stations and bathymetric surveys that track both vertical and horizontal ground movement. These real-time data are compared against model predictions, allowing for continual refinement of subsidence models and further optimizing the subsidence management plan. Performance indicators are established to monitor infrastructure integrity, ecosystem health, and safety. Underground panel surveys and “as-built” verifications are also conducted to ensure mining activities align with approved mine designs, while geotechnical hazard mapping strengthens underground safety protocols.

The subsidence monitoring programs are formally reviewed at least every 3 years or sooner if triggered by stakeholder concerns, changes in management requirements, unexpected impacts, or the need for additional actions. An annual subsidence management report is prepared, incorporating monitoring data and environmental performance to ensure ongoing protection of dependent ecosystems.

In the event that monitoring reveals significant trigger conditions such as exceeding thresholds, we immediately activate the incident response measures. These include notifying and engaging stakeholders through the Community Consultative Committee (CCC), investigating to identify root cause, and implementing corrections to address non-compliance and corrective actions to prevent recurrence. Findings are documented in the annual subsidence management report. This structured and transparent approach not only safeguards the environment and surrounding communities but also reinforces Banpu’s commitment to responsible and sustainable mining practices.