Geological Survey of South Australia: An overview of the Gawler Craton Airborne Survey – new data and products The Gawler Craton Airborne Survey The 1.66 million line km Gawler Craton Airborne Survey (GCAS) is now moving into its final stage, with 99% of its magnetic, radiometric and elevation data acquisition now complete (Figure 1). There has been a recent pause in acquisition due to shared access arrangements within the Woomera Prohibited Area (WPA), however that has not stopped the continued processing, quality control and data enhancements being applied to the currently acquired data, as the GCAS team endeavour to release one of the most comprehensive, high quality airborne surveys in South Australia’s history. The survey has captured magnetics, radiometrics and elevation data at 200 m line spacing with a 60 m ground clearance, improving the resolution of existing grids based on existing 400 m line spaced data by a factor of 4. Data QC Contractors employed on the GCAS were required to adhere to comprehensive technical specifications set out by Geoscience Australia (GA). Geophysicists from GA and the Geological Survey of South Australia (GSSA) performed data QC and employed several new QC techniques for the GCAS. GSSA developed a method of communicating QC results between the contractors, GA and GSSA simultaneously through Figure 1.  The GCAS acquisition is 99% complete. Magnetic images on the map show areas for which data has been released. News Geophysics in the Surveys 24 PREVIEW JUNE 2019