Including the structural geology of most open pits is a critical input into the geotechnical stability analyses and ultimately in the design of the pit. We are seeing large 3D numerical models being constructed with multiple fault structures, which are often only represented by one or two different Mohr-Coulomb strengths and not really considering the potential changes to the fault characteristics in 3D.
The nature and characteristics of structures can change substantially depending on such aspects like fault geometry and intersections, lithology type, geological terrain and alteration influences. It is essential to be able to evaluate the variability of these structures in 3D and to also be able to discuss the reliability of the interpretation and the potential range of conditions that could be experienced in areas with less mapping or drill hole information. Not only is this information important for the numerical modelling, but it is also important for understanding local performance on a multi-bench and inter-ramp scales, as well as the rock mass performance above and below critical infrastructure items such as ramp accesses.
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