b'Geophysics in the surveysNewsinvestment in minerals exploration underarrangement the NTGS, as the primaryDelivered productsthe four-year Resourcing the Territoryfunding agency, developed the survey initiative, which runs until 2022. Thedesign and invited industry to fundAn extensive suite of deliverable survey is one of the largest of its kindinfill of their areas of interest at 100 mproducts are available for this survey undertaken in the Territory, and theline spacing. Acquisition contractincluding the industry infill areas data produced will help explorers locatemanagement and data quality assurance(Figure3). They comprise:mineral deposits they can develop intowere provided by GA on behalf ofLocated data: raw edited and final ASEG future mining projects. NTGS under a National CollaborationGDF2-compliant datasets for elevation, Framework agreement. The benefitsmagnetics and radiometrics plus an A premier exploration destination to industry from infilling NTGS-ledNASVD-processed spectral radiometric programmes include economies of scale,dataset.The Tanami Region is host to multipleoutsourcing of project management and 1 Moz+ gold discoveries includingdelivery of high-quality products (Dhu,Gridded data: In ER Mapper format of the world-class Callie gold mine. ThisMcCoy, and Scrimgeour 2019). On thismagnetics, magnetics reduced-to-relatively under-explored province isoccasion, industry partners funded thethe-pole, first vertical derivative of emerging as a premier gold explorationacquisition of 33 000 km of infill data. magnetics reduced-to-the-pole, dose destination for major gold producers withA considerable improvement in datarate, potassium, thorium and uranium several projects already at an advancedquality was achieved compared to theconcentrations, ground elevation from stage. The new magnetic data will playprevious regional NTGS Tanami andboth radar and laser data.a crucial role in enabling the mappingGranites surveys acquired in the 1980sMerged grids: Combining the two and modelling of the bedrock geology(Figure 2). This enhancement is due to amain survey blocks flown at different beneath the largely sand-covered terrainnumber of changes: the closer line spacingorientations and levelled to the AWAGS while the radiometric data will aid in the(200 m vs 500 m), a lower flight heightbased national grids.search for REE mineralisation as well as(60 m vs 90 m), improved flight pathImages: GIS ready images in GeoTiff unconformity-style or palaeochannel- navigation (visual/doppler vs differentialformat of the grid data.hosted uranium mineralisation (Ahmad,GPS), increased sensor sensitivities and Vandenberg, and Wygralak 2013). sampling rates and flight line orientationsReports: Comprehensive logistics reports appropriate for the regional geologicaland processing documentation.Multi-party collaboration benefits trends (EW lines in the north and NS lines in the south). Data quality wasData availabilityThe survey was also the first NTGS- assured under GAs management of the led multi-party collaborative airborneproject with the contractor achieving highImages of the new geophysical datasets magnetic and radiometric surveytechnical specifications set out by GA forare available on the Geophysical Image between the NT Government, privateboth the acquisition and processing stagesWeb Server (http://geoscience.nt.gov.au/ companies and GA. Under thisof the survey. giws).Figure 2.Example of the improved resolution of thin magnetic features achieved from the current survey (right image) compared to the previous regional survey data (left image).23 PREVIEW OCTOBER 2019'