Summary

The Airborne Magnetic Tensor (AirMt) system measures the rotational invariants of the transfer functions for audio-frequency natural sources from helicopter platforms. AirMt, data are typically measured from 30 Hz to 720 Hz, giving detection depths down to 1 km or more, depending on the terrain conductivity. Given the airborne deployment, it is possible to acquire AirMt data over large areas for a relatively low cost compared to equivalent ground surveys. This makes it a practical method for mapping large-scale geological structures. We describe the theory of the AirMt system, and present a case study comparing 3D inversion results from ZTEM and AirMt surveys flown over the Nebo-Babel Ni-Cu-PGE deposit in Western Australia. Our 3D inversion results are shown to be in good agreement with the known geology of the deposits and the surrounding area.

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