Engineering Geology Model as a tool for the effective management of Open Pit Slopes

The engineering geology at every mine site has developed through complex interactions of geological processes over vast periods of time. The inherent variability between these processes and sites poses challenges in developing suitable pit slope designs due to both limited data and understanding, leading to uncertainty and associated risks.

Risk management for slope stability involves the identification, assessment, and mitigation of potential risks. A robust engineering geological model serves as an invaluable tool for effective risk management by providing insights into anticipated ground conditions. This paper provides a review of the engineering geology at three open pit mine sites from Australia and Southeast Asia. While the geological environment at each site is substantially different the underlying geological understanding enables effective slope design management and risk mitigation strategies. These strategies include the application of a geological model at a site in a highly active tectonic setting, showcasing how it facilitates identification of areas with elevated risk during operations.

The paper also presents how the engineering geology model at each site has evolved over time, particularly following slope instability events. The findings and guidelines presented herein provide valuable insights for professionals involved in slope design, enabling them to make informed decisions and enhance safety.