Georgetown AEM survey: Preliminary Results

An AEM (airborne electromagnetic) survey will be flown over the Georgetown Inlier, Queensland, Australia between July to August 2024. The Helicopter borne time-domain survey includes 10,500 line-km of EW trending lines with 2 km line spacing. The flight lines will traverse both covered and exposed sectors of the inlier, offering an additional resource for mapping beneath surface cover and for mineral exploration in the region. Previously, AusAEM survey with 20 km line spacing was completed over the western part of Georgetown inlier and showed that to the north of outcrop, where the new survey is located, the depth to the top of the Palaeozoic rocks is mostly less than 30 m. However, to assure the desirable penetration depth is achieved, the new Xcite system from NRG with minimum base frequency of 12.5 Hz is used. In addition, the new NxT generation airborne gravimeter add-on was fitted to the system upon Geological Survey of Queensland (GSQ) request to compare the data with existing regional and new AGG (airborne gravity gradiometry) data. The preliminary results on the AEM survey using Aarhus Workbench and a comparison with Geoscience Australia Layered Earth Inversion (GALEI) algorithm, where applicable, will be presented.