Remanent magnetization mapping: A tool for greenfields magmatic Ni-Cu-PGE exploration undercover

Remanent magnetization dominates induced magnetization in several types of mafic-ultramafic magmatic rocks, allowing for remote targeting of such lithologies based on their magnetization direction. This project evaluated practical methods for utilising remanent magnetization as a first pass tool for Ni-Cu-PGE exploration in remote, undercover areas in the Huckitta area of Central Australia. Modelling results demonstrate that measured magnetizations can be used to accurately model target intrusions regionally. Two automated methods tested for remote mapping of magnetization, produced inconsistent. However, a customised reduction to pole (RTP) grid transformations based on measured magnetization directions proved a more effective method of mapping specific mafic suites regionally. These custom RTP grids were used with constrained modelling to guide target selection with MMG for an undercover area in the east Arunta.

Graphical Abstract which shows that whilst automated magnetisation mapping techniques are not effective, transformation of the magnetic field can be effective form mapping intrusions of similar ages.

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