Abstract
Calibration of a numerical model to observed rock mass behavior is essential for predicting future behavior, which significantly impacts all aspects of stope design, including dimensions, blast sequences, safety protocols, and the management of seismicity. Vale's Copper Cliff South mine is currently mining several remnant stopes located in mature areas with a very high extraction ratio. The behavior of these stopes during mining can vary widely based on the ground's stress state. Therefore, having a well-calibrated numerical model is crucial for predicting the seismic behavior of the stopes and making informed design choices. This article will present the fundamentals of a well-calibrated model using Map3d and tailored to this specific stoping configuration at Copper Cliff, along with examples to support the calibration results. Furthermore, the model will be applied to the remaining stopes in this area, discussing the implications for stope behavior and safety, as well as strategies for risk reduction.