ABSTRACT
Open pit mining is a practical and cost-effective method of mining as it facilitates efficient equipment movement and material extraction. However, the exposure of open-faced slopes makes them susceptible to failure as a consequence of active mining operations and other site conditions, thereby posing risks to workers and other assets. In this study, slope stability of an open-pit mine in Philippines is investigated by Limit-Equilibrium Method. Performance is particularly of concern as the mine is below mean sea level—resulting in progressive movement. It is, therefore, essential to establish appropriate slope models that capture actual failures observed on-site. Forensic investigation was carried out by sensitivity analysis of geotechnical parameters until results corroborated reality. Through this iterative calibrated approach, it is possible to formulate optimal solutions for risk and hazard mitigation while aligning them with mining operations and evacuation programs. The importance of geotechnical investigation and performance monitoring are further highlighted.
