Magnetotelluric (MT) measures the natural variations of the Earth’ magnetic and electrical (telluric) fields. In 2018, MT data including broadband and audio-magnetotelluric data were collected across the Olympic Domain in South Australia. MT data at 327 sites with spacings from ~1.5km to ~10km were collected by contractor Zonge Engineering and Research Organisation Australia, on behalf of Geological Survey of South Australia and Geoscience Australia. The survey was funded by the Geological Survey of South Australia's PaceCopper Initiative. Six extra MT stations (MASLIN1-6) were collected and funded by Investigator Resources Ltd. They were provided by Geological Survey of South Australia. This data package contains 333 processed edi files across the Olympic Domain in South Australia.

The 2017 Olympic Domain Airborne Electro-Magnetic (AEM) Survey was conducted by Geoscience Australia as part of a collaborative project between the Commonwealth of Australia (Geoscience Australia) and its partner the State of South Australia (Department of State Development: Geological Survey of South Australia). Geoscience Australia contracted SkyTEM Australia Pty Ltd to acquire heliborne AEM data over the Olympic Domain in South Australia using their proprietary 312M SkyTEM Interleaved Low Moment and High Moment system trading as "SkyTEMfast". The raw data were processed using SkyTEM Aps Denmark, SkyTEM Australia Pty Ltd’s proprietary software. The survey area consists of 3073.4 line km of time-domain AEM geophysical data acquired in a single survey block located on the 1:250000 map sheets, SH53-12 (Andamooka) and SH53-16 (Torrens) approximately 420 kilometres north-north west of the city of Adelaide, SA. The traverse lines were flown in an East-West orientation with line spacing of 1500 and 3000m. Recent AusLAMP (Australian Lithospheric Architecture Magnetotelluric Project) results and modelling across the Gawler Craton have revealed zones of enhanced crustal conductivity at depths of 15-40km in the mid to lower crust along the eastern margin of the craton. These zones coincide with the highly prospective Olympic Domain IOCG belt and may indicate the presence of a mantle plumbing system that contributed to the formation of the mineral systems and deposits in this belt. A key example of this enhanced crustal conductivity exists in the Prominent Hill-Carrapateena-Punt Hill area within the central Olympic domain. The AEM flight line locations were designed to cover these AusLAMP identified deep crustal conductive zone and investigate possible upward continuation of the deep crustal anomaly through the cover sequence. The data have been inverted with the AarhusInv Program using the Aarhus Workbench LCI algorithm. The data release package includes: 1) Point-located Low Moment & High Moment dB/dt electromagnetic data with associated position, altimeter, orientation, and derived ground elevation data. These data are in ASCII column format with associated ASEG-GDF2 header files. 2) Point-located conductivity data derived from the inversion of the observed data with the AarhusInv Program using the Aarhus Workbench LCI algorithm. 3) Gridded data (600m cell size) in ER Mapper® binary raster grid format with associated header files for the conductivity depth slices derived from the Aarhus Workbench LCI data, with and without depth of investigation (DOI) masking. 4) Gridded magnetics and elevation data in ER Mapper® binary raster grid format with associated header files. 5) Graphical multiplots, in PNG format, for each flight line showing Aarhus Workbench LCI model sections (with DOI mask line) with profiles of the Low & High moment Z component dB/dt data and the model fit residual. 6) Contractor supplied Operations Report. 7) ESRI shapefiles of the flight lines. 8) Metadata and License files.