Understanding the structural framework of a region is critical in identifying areas of potential mineralization; consequently, the structural and lithological interpretation of 2D and 3D geophysical data is a powerful tool in mineral exploration targeting. Aeromagnetic data are particularly useful, since they display a wider range of geological attributes than radiometric, gravity, and electromagnetic data. They can be applied at any scale or depth, in all terranes, with high resolution. SRK is an expert in the interpretation of aeromagnetic data and has completed projects worldwide for a wide range of commodities at scales ranging from deposit- to district- and country scale, with proven results leading directly the discovery of new deposits.
The interpretation of aeromagnetic data is based on three fundamental processes: interpreting geophysical data, applying geological models that must include an understanding of the geological history, and mapping mineral system concepts.
SRK’s process involves a systematic approach that involves recording form lines from derivative imagery, cross-referencing aeromagnetic observations with surface geological data, integrating additional data sets, interpreting fault locations, scales, ages, and kinematics, and forming a working solid geology interpretation map. This approach helps generate a structural and lithological framework that combines geophysical data with mapped geology, which can be interrogated by mineralization models over a wider area than traditional methods. Interpretations of aeromagnetic data can provide information on paleo-stress orientations and fault kinematics at the time of mineralization. Zones of enhanced structural complexity and/or dilation commonly promote mineralization. These zones can be defined by the analysis of fault kinematics, fault and intersection density calculations, and by fault segment orientation analysis. When combined with knowledge of the geological history and its relationship to mineralisation, this can provide accurate targets and help design drill programs. High-quality interpretations provide a broad view of geological processes and features, making it a cost-effective solution for guiding exploration strategy.
