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The New Mine Level Project is a 130,000 tonnes per day (tpd) panel caving project set to start in 2017. The high stresses, complex structural setting and high mining rates presents a major challenge in terms of seismicity management and rockburst hazard reduction. This paper is a case study of the calculation of the energy requirements needed to design a dynamic support system. This analysis starts with the estimation of the seismic source forecasted through the use of numerical modelling and verified with observed past data, later peak particle velocity (ppv) is calculated at the drifts with a ppv attenuation model, and an amplification factor is used near the excavations. Finally, the amount of fractured rock around the drifts that could be ejected by a seismic event is calculated through numerical modelling. With the ejection velocity estimated from ppvs, energy demand can be obtained. All the values resulting from numerical analysis were compared to historical data of similar mine sectors. The results shown that the methodology used in this paper agrees well with previously observed rockburst episodes, therefore it was used to calculate the yielding support of this new deep mine project.

Numerical modelling and rock support design in Codelco’s New Mine Level panel caving project