b'AEGC 2023Short abstractssericite alteration of the magmatic minerals. Weak brecciationare increasingly seeking access to reliable, secure, and and iron oxide alteration commences at the outer edge ofresilient supplies of the critical minerals they need. The the breccia complex and increases in intensity towards thepace of technological development has been accelerating deposit centre (sulfide barren core with hematite, quartz,along with the demand for minerals critical to sectors like barite). Disseminated sulfide mineralisation occurs with variabledefence, aerospace, automotive, renewable energy, and mixtures of mainly hematite, quartz, sericite, K-feldspar, fluorite,telecommunications. This has made exploration geologists siderite, barite. The bulk dry density in the RDG ~ 2.7 g/cm3, butapply new technologies like artificial intelligence (AI) to varies within the breccias from 2.7 - 4.5, can be expressed as aincrease the success rate of exploration projects. Recently, function of hematite abundance. Abrupt changes in brecciationmachine learning as a subset of AI has been successfully and/or alteration intensity are usually related to the presence ofapplied in different fields such as spatial data analysis to sub-vertical faults. In support of a deep drilling programme toaddress different problems. This study proposes a machine define the lower extents of Fe-oxide alteration, BHP undertooklearning-based framework for generating prospectivity maps of a feasibility study to determine the viability of conducting a 3Dcritical minerals. This framework benefits from different novel seismic survey of the Olympic Dam deposit. P-wave velocitymachine learning methods for various purposes, including an measurements were systematically collected, via hand heldimproved generative adversarial network to overcome the class instruments, on diamond drill core spanning the spectrumimbalance problem of the training dataset and the combination of alteration and brecciation styles present across the brecciaof a positive and unlabelled learning method and random complex and into the RDG. In this presentation, the results offorest as the main classifier for predicting mineralisation at the velocity measurement study, correlated with alterationtarget points. We evaluated the efficiency of our proposed intensity and sulfide mineralisation, will be discussed. framework by creating prospectivity maps of mafic-ultramafic intrusion-hosted mineralisation for three different commodities, including cobalt, chromium, and nickel in the Gawler craton, New developments with the HeliSAM and UAVSAMSouth Australia. Various exploration datasets were used as input systems, for use in mineral exploration. features, including publicly available geological, geochemical, Daniel EremencoMalcolm Cattach , Dennis Woodsandand geophysical datasets. We used known mineral occurrences 1 1 2Stephen Griffin as positive samples and created different sets of random 1samples throughout the study area as unlabelled samples. 1 Gap Geophysics AustraliaBased on our results and different evaluation metrics, the 2 Discovery International Geophysics Inc models performance is stable, and its accuracy is significantly higher than the map generated by a conventional approach UAV systems have exploded in popularity, due to advantagesusing a standard random forest classifier. Our prospectivity map in speed, accessibility, improvements to electronics technologyshows a strong spatial correlation between high probability and general availability. The advantages are offset somewhat byvalues and known mineral occurrences and predicts several difficulties in reliability, navigation and safety. Gap Geophysicspotential greenfield regions.Australia developed a UAVSAM receiver system back in 2017. Still, we believed UAV technology was not quite at the standard expected by the mining industry, both from a safety point ofCause-and-effect of plate motion and crustal view and for reliability of daily survey work. Miniaturisationthickening using time-series analysis and data efforts of the Sub-Audio Magnetic (SAM) technology have beenanalytics.the goal for some time, with obvious improvements to the safety of field workers by reduced manual handling strain andAlex Farrar, Matthew Cracknell and David Coookeinjury expected, in addition to efficiencies in survey logistics or better draping of terrain and cost benefits.One of theCentre for Ore Deposit and Earth Sciences (CODES), University of benefits of this innovative drive towards miniaturisation wasTasmaniathe realisation that significant improvements could be made toGiant porphyry copper deposits (PCDs) in the central Andes the existing SAM and HeliSAM receiver platforms. In the latterform in discrete spatial and temporal clusters, indicating that case enabling a more compact system that did not requireexceptional geologic processes transiently affected localised any instrumentation in the aircraft itself. This would vastlyregions of the lithosphere around the age of mineralisation. simplify approval processes and engineering certifications. ThisDevelopment of favourable conditions for significant metal system is now operating in Greenland in that exact capacity,concentration in the lithosphere are theorised to be linked which would not have been possible with the first generationto the overlap of structural pathways that focus ascending HeliSAM system. In this paper, we provide updates to both thefluid and magma flow from the mantle to upper crust during GAP HeliSAM and UAV platforms and also showcase data fromperturbations to the regional stress field during terminal stages surveys in Australia, North America and Europe. of orogenic cycles.Prospectivity mapping of critical minerals using aTo investigate the role that plate tectonics has in controlling the formation of PCDs one needs to consider which of the many, machine learning-based framework. and often uncorrelated, plate motion and orogenic models are Ehsan Farahbakhsh and R. Dietmar Muller best suited for analysis. However, an assessment of the cause-and-effect nature of plate motion and crustal thickening, as well Sydney University as the differences between independent tectonic models has, up until now, received very little attention.While global demand for critical minerals is increasing, global supply is uncertain due to the market, technical,We examine five different plate motion models for the and commercial risks of exploration projects. Countriesconvergence of the Nazca and South American plates 95 PREVIEW FEBRUARY 2023'