b'Geophysics in the surveysNewsthat produce a smooth model with a good data fit, as well as advanced Monte Carlo algorithms that sample hundreds of thousands of models with good data fit and allow rigorous specification of prior knowledge of subsurface conductivityIn the final session, we explored how we interpret subsurface features from AEM conductivity models at Geoscience Australia The focus of this session was on avoiding some of the common pitfalls in AEM interpretation by understanding the considerable uncertainty and ambiguity involved By facilitating this workshop and providing practical examples for participants to work through, we aimed to build an AEM community within Australia that can make the best use of these valuable and relatively easy to acquire dataFigure 2.Hands-on AEM workshop, hosted by GA and AIG in Perth on 11 August. Due to the level of interest and positive feedback received, we are hoping to run the workshop again in early 2023storage The data package is available onled to rapid expansion of Australias request via http://pidgeosciencegovau/ AEM coverage over the last half aAirborne geophysical survey dataset/ga/146309 decade through Geoscience AustraliasupdatesExploring for the Future programme AEM workshop and collaborations with state andAirborne EM programmes through the territory geological surveys The teamWestern Resources Corridor (see Figure Geoscience Australia ran an AEMat Geoscience Australia is experienced1, blue hashed areas straddling the workshop on 11 August 2022 as partacross all aspects of AEM programmesSA/WA/NT borders) and through the of the Exploring for the Future mid- including survey planning, managingEastern Resources Corridor (see Figure term deliverables Run in collaborationdata acquisition, data QA/QC,1, blue hashed areas through NSW and with the Australian Institute ofprocessing and inversion, and geologicalVic) are expected to be completed by Geoscientists (AIG), it was attendedinterpretation In this one-day workshopmid-October Survey datasets, including by 36 representatives from industry,we aimed to pass on our experience byinversions with GAs own deterministic contracting operations and governmentdemonstrating AEM theory and practice products, should be available early next agencies (Figure 2) The one-dayThe workshop had three sessionsyearprogramme in Perth provided a practicalcovering data acquisition, AEM inversion,This month also saw the delivery of guide from data acquisition, qualityand interpretation In the first session,final contractor products to GA for control, through to data inversion andwe introduced the theoretical principlesthe East Tasmania airborne magnetic interpretation of airborne electromagnetic surveys,and radiometric survey This 57 000 Updated from the website (https:// walked through the process of planningline km survey across south eastern wwwaigorgau/events/geoscience- data acquisition and demonstrated ourTasmania (see Figure 1) was conducted in australia-aig-short-course-airborne- best practices for QA/QC in the context ofcollaboration with the Mineral Resources electromagnetic-workshop-a-practical- Geoscience Australia AEM technical deed,of Tasmania, with one of the key aims guide/): which assures AEM data are acquired to aof providing a high resolution dataset high standard to map the base metal (and critical Geoscience Australia has been heavilyminerals) potential We are expecting involved in developing airborneIn the second session, we exploredto publish the dataset within the next electromagnetics (AEM) as a geophysicalthe inversion of AEM data to generatemonthmethod, from its origins as a qualitativebulk conductivity models This session bump finding survey technique toincluded a tutorial on the range ofMike Barlow a quantitative tool for subsurfaceinversion codes developed in-house,Geoscience Australia modelling This advancement hadincluding deterministic Occam inversionsMike.Barlow@ga.gov.auOCTOBER 2022 PREVIEW 16'