b'Geophysics in the SurveysNewsGeological Survey of South Australia: An updateGawler Craton Airborne Survey using 11 different aircraft over a periodthe signatures of ore-forming systems. of two years without a significant safetyThe data are also used in mapping The Geological Survey of South Australiaincident. the surface and subsurface geology, and Geoscience Australia are pleasedparticularly in areas with extensive to announce the completion of theThe Gawler Craton hosts the world-classcover sediments such as the northern acquisition phase of the 1.67 million lineiron oxide copper-gold (IOCG) provinceGawler Craton. Approximately 45% of the kilometre Gawler Craton Airborne Surveythat includes the copper-rich Olympicland within the GCAS area is currently (GCAS) Figure1, covering 294 000 km2Dam, Prominent Hill and Carrapateenaoccupied by minerals exploration leases with high resolution magnetic anddeposits, the Challenger gold deposit,and exploration lease applications.radiometric data over the Gawler Cratonand iron ore deposits of the Middleback in northern South Australia (put intoRange. Geologically young sedimentsThe Gawler Craton Airborne Survey perspective, the survey covers an areaoverlying the Gawler Craton host thehas set new standards across a range the size of Italy with the distance flowngiant Jacinth-Ambrosia heavy mineralof benchmarks including landholder being equal distance to travelling to thesand deposits, which are major sources ofcommunications, community moon and back twice, or around thetitanium and zirconium. information, and data delivery via world at the equator 41 times!). Flown atthe Gawler Craton Airborne Survey 60 m clearance and 200 m line spacing,Airborne magnetic and radiometricCommunity Information Website. the survey employed four contractorsdata are key tools for directly detectingThere have been over 2200 GCAS Figure 1.Acquisition for the GCAS is complete with data becoming available over the coming months.25 PREVIEW AUGUST 2019'