b'Geophysics in the surveysNewsthe relative positions and angles of the transmitter and received configuration with respect to the ground. This is particularly the case with older AEM surveys where these nuisance parameters were never measured or modelled. By using this approach and a new methodology for driving lateral continuity in the inversion through a bunch by bunch (of soundings) process, a far more geological realistic and noise-reduced image can be generatedeven from old datasets and system setups (such as GeoTEM).Fixed-wing vs helicopter AEM systems: A Bayesian resolution analysis Figure 2.3D view of the Western Resources Corridor AEM data release, March 2023, captured frompresented by Anandaroop Ray. This GAs Exploring for the Future portal - see https://portal.ga.gov.au/3d/restore/24bac144-e5ed-43a8-a8cc- paper compares platform-specific 77a8787b7fc6. Stretching from the Kimberleys in the north to the Great Australia Bight in the south, theattributes such as flying height, 58 858 line km programme on 20 km line spacing includes semi-detailed (5 km) line spacing across thetransmitter loop area, current source Musgraves (southern NTcentral eastern WA) and western Gawler Craton (central SA). Western Australianwaveforms, aerodynamic stability regional coverage was 100% funded by the Western Australian Government. and data stacking times to show how This data package includes thethe Curnamona Cube Extensionthey contribute to the geological acquisition and processing report, theMagnetotelluric (MT) survey in westernresolvability of the subsurface.With final processed AEM data, and the resultsNew South Wales and eastern Southboth synthetic models as well as of the contractors conductivity-depthAustralia. Audio- and broadband-MTreal data from over the Menindee estimates. The data package also containsdata was acquired at about 100 sitescalibration range in New South Wales, the results and derived products from aon a 25/12.5 km grid. Processed dataAustralia, a novel Bayesian inversion 1D inversion by Geoscience Australia withfor each site have periods in the rangescheme is employed to shed new light its own inversion software (Figure 3). 0.0001 s to 1000 s. This survey extendson how these attributes impact the the spatial coverage of the Universityinversion model problem.The findings The survey was flown by Xcalibur Aviationof Adelaide/AuScope Curnamonahave useful implications in AEM system (Australia) Pty Ltd using its TEMPEST AEMCube MT survey from the Curnamonaselection, as well as in the design of system. GA managed all aspects of theProvince into the Delamerian Orogen.better deterministic AEM inversion acquisition, quality control and processingInterpretation of thecombined dataalgorithms.of the AEM data, with in-kind support fromwill provide additional information onAusAEM is the worlds largest airborne the Geological Survey of Western Australiathe mineral prospectivity of the region,electromagnetic (AEM) survey (GSWA), the Northern Territory Geologicalspecifically associated with the geologicalundertaken presented by A. Yusen Survey (NTGS) and the Geological Survey ofrelationship between the CurnamonaLey-Cooper. Airborne electromagnetics South Australia (GSSA). Province and Delamerian Orogen.surveys are at the forefront of Data from the extension survey will beaddressing the challenge of exploration Exploring for the Futurereleased mid-2023 and related electricalundercover. They have been essential programmeCurnamona Cubeconductivity models in late-2023. in the regional mapping programmes to build Australias resource potential Extension MT Survey inventory and provide information Australian Exploration Geoscienceabout the subsurface. In collaboration During February and March 2023Conference, 2023GA geophysics- with State and Territory geological Geoscience Australia conducted specific presentations surveys, Geoscience Australia (GA) leads a national initiative to acquire AEM data For those of you unable to get along toacross Australia at 20 km line spacing, the AEGC this year, Geoscience Australiaas a component of the Australian presented three outstanding airbornegovernments Exploring for The Future EM-intensive talks from its team of(EFTF) initiative. Regional models of geophysical specialists. In brief: subsurface electrical conductivity show new undercover geological features Enhancements to deterministic AEMthat could host critical-mineral deposits inversion through better geometryand groundwater resources (Figure 3).constraints and a bunch-by-bunch algorithm presented by Ross Brodie.Extended abstracts for all three papers This paper stems from a collaborativewill be available on the ASEG website in Figure 3.View looking to the east along theresearch project between Geosciencethe very near future.N-S conductivity-depth sections, derived from Geoscience Australias Layered-Earth-InversionAustralia and CSIRO, and demonstrates modelling, highlighting the AEM lines showingthe value of applying joint componentMike Barlow disruption in conductive stratigraphy related to(X and Z) inversion to eliminate theGeoscience Australia localised movement. impact of uncertainty associated withMike.Barlow@ga.gov.au23 PREVIEW APRIL 2023'