b'Geophysics in the surveysNewscompanies before 2016 will become open file in the first half of 2022 under the NSW Governments sunset clause Mining Regulation Amendment (2016). The GSNSW will incorporate these new data (if quality is acceptable) into an updated suite of magnetic imagery that greatly improves anomaly resolution over the previous magnetic maps.The statewide magnetic imagery is a merge of over 60 regional government surveys flown at 200400 m line-spacing. The addition of over 100 company surveys flown at 50200 m line-spacing in the 2020 update has improved the image quality and allowed the data to be gridded at a smaller cell size (25 m vs 50 m). This prevents under-sampling of complex magnetic signatures. Over 100 additional company surveys have been selected for inclusion in the 2022 update once their data becomes open file under the sunset clause.The merged statewide TMI grid is theFigure 5.Map of the 2020 and planned 2022 NSW state wide magnetic merges, coloured by survey line-building block to create a series ofspacing. Most of the Precambrian and Palaeozoic terranes will be covered by 250 m line-spacing or better.enhancements. Reduction to the Pole,will be publicly available in the secondmeasurements have been recorded at First and Second Vertical Derivative,half of 2021 through MinView. 315 sites on a 55 km grid across NSW and Tilt Angle filters were applied to(Figure 6). These data were combined the grid and then reprojected intowith 70 stations from Victoria and a suite of projections relevant forAusLAMP field data acquisitioninverted using the ModEM code (Egbert NSW. The grids were used to createand Kelbert 2012) on a high-performance the high-quality magnetic imagerycompleted in NSWavailable through MinView, deliveringcomputer to create a 3D model of the best-available image resolution overThis project commenced in 2016 andresistivity of the crust from 5150 km the entire state, especially in regionsis a collaboration between GSNSW anddepth (Kirkby etal. 2020). Preliminary covered by the company surveys.GA. Long-period magnetotelluric (MT)results and models are available through This allows for more comprehensive delineation of magnetic features, which aids both geological interpretation and geophysical exploration with the overarching aim of de-risking exploration through better upfront resource targeting and greater overall investment in the sector for NSW.Statewide radiometric merge update coming soonAdopting the same merge procedure and using the same algorithmic approach to survey selection, The GSNSW is updating the radiometric merge for the first time since 2014. The recently completed Cobar AMR survey was carefully designed to fill the gaps in radiometric coverage in the Cobar area. The merge will also include other government-flown surveys since 2014, as well as many of the highest quality company-flown surveys. The resolution of the merge will be greatlyFigure 6.Map showing AusLAMP long-period MT station locations in NSW (black crosses), the state enhanced by adopting a 50 m grid cellboundary (blue line), major roads (brown lines) and major towns. The background image is the 30 km depth slice from the resistivity model created by Kirkby etal. (2020). Low resistivity is shown in red and high size compared to the 100 m grid cell sizeresistivity is shown in blue. This image shows conductors in the deep crust that may indicate the presence of of the existing merge. The merged dataheat and/or fluids, which could drive mineralising processes.AUGUST 2021 PREVIEW 20'