b'AEGC 2023Short abstractssensor strings and the seismic while drilling methodologygeological interpretation of geophysics. Elevated concentrations develop dare envisaged for life of mine sensing and geologicalof pathfinder elements (As, Sb, S, Cu, W) correlate with Au characterisation. Thus, various tests have been performed towhich indicates alteration related to the hydrothermal system. evaluate whether the gathered data might be useful for variousPrincipal component analysis using geochemical data alone can future applications from advanced exploration and geologicalbe used to discriminate magmatic and hydrothermal processes. characterisation through to mining and extraction. VariousThese insights can be incorporated into multi-scale data modifications of the seismic string installation with respect tointegration workflows to determine key processes and inform 1-C and 3-C sensor pods and grouting method were trialled andexploration programmes targeting orogenic gold in Archean all configurations were generally found useful. However, somegreenstone belts similar to Yilgarn granite-greenstone terranes.configurations are better suited for tomography and others better for later micro-seismic analysis.Why accelerating the rush towards seismic for The drill as a seismic source was found to be rich in both P andprospecting?S wave modes with reasonable energy from 10 Hz to over 500 Hz, at distances of up to 200 m from the diamond drill bit. SmallMosayeb Khademi Zahedi 1, Tito Lozada Tucci2 and Tom Marsh3modifications to the drilling procedure allowed us to perform checks on the data quality and acquisition system. The lack of1 Mineral Exploration Cooperative Research Centrea measured zero-time or measured source signature with the2 Rock Flow Dynamics, Perth, Western Australia SWD creates serious challenges for implementing conventional3 Rock Flow Dynamics, Aberdeen, UKcross-well tomography algorithms. A configuration of twoA three-dimensional seismic survey from onshore Taranaki boreholes with permanent sensors and the drilling of anotherBasin, New Zealand, is analysed using logs and borehole data hole in line with the first two allows cross-correlation methods toto identify the faults and main structural lineaments in the reasonably extract travel times. However, the repeating patternstudy area. Faults and damage zones provide permeability for of energy generated by the seismic source due to drill rotationfluid migration and hence are likely primary control on the at 10-40 Hz presents challenges to this approach too, which wedistribution of resources. Seismic data interpretation can be have overcome. Despite challenges seismic while drilling withused for geological mapping and prospecting as petroleum diamond drill rigs in conjunction with geophone sensor arrays isindustry have proven correct for more than 60 years. Velocity feasible and should provide very useful life-of-mine data. and density are two physical properties of rocks that are expressed as acoustic impedance on seismic data. Fault and damage zones cause lateral and vertical changes in acoustic Discriminating magmatic and hydrothermal processesimpedance and thats reflected as discontinuities on seismic. in borehole data: implications for orogenic gold inWe interpret several discontinuous reflections in the three-Yilgarn Craton, Western Australia. dimensional seismic to be fault zones that correlate with logged faults using borehole data. Seismic attributes can reveal Mosayeb Khademi Zahedi 1, David Giles1, Caroline Tiddy1,features consistent with fault zones within the dominantly Mark Lindsay2,3 and Andrej Bona4 sedimentary rocks. Coherence and Variance attributes alone can be used to discriminate discontinuities and trends in seismic 1 Mineral Exploration Cooperative Research Centrecharacter. We interpret several features related to structural and 2 CSIROstratigraphic patterns, for example damage zones indicating 3 University of Western AustraliaNW-SE striking faults. Machine Learning Based Seismic Faults 4 Curtin University Detection can be used to identify seismic shear zones and high-We used petrophysical and geochemical data from boreholeangle fault corridors based on calculated attributes detecting from Fortitude North prospect to determine magmatic anddiscontinuities and an unsupervised machine learning hydrothermal processes in a gold mineralising system fromalgorithm. This approach is specifically useful in identifying Archean Yilgarn Craton of Western Australia. Dominant rockslocal changes in the seismic wavefield and hence optimal are dolerites and basalts, covered by approximately 50 m ofdiscontinuities detection in seismic data. The role of damage transported regolith and saprolitic weathering from 10 to 50zones and major structures acting as migration pathways is m. There is a positive correlation between density and velocity,well proven in petroleum and mineral systems. The continuous with highest property values consistently in un-weathereddevelopment of seismic technology as well as its potential in dolerite units. Meter-scale zones of low density and velocityresource prospecting allow explorers to take a more robust correlate with logged fault zones. We interpret a steeplymulit-scale integrated approach to determine key geological east-dipping zone of lower amplitudes and discontinuousprocesses towards discovery of resources.reflections in a 2D seismic profile to be a fault zone and likely primary control on the distribution of mineralisation. Whole- How many layers? A Bayesian Occams Razorrock geochemical data show trends consistent with magmatic fractionation within the dominantly mafic host rocks. Ti, Fe andAndrew KingP have positive correlation with Zr, whereas Mg has negative correlation indicating magmatic fractionation. Ti reaches aAirborne electromagnetic (AEM) methods are increasingly tipping point (at ~110 ppm Zr and ~1.1% Ti) consistent withbeing used to provide information about the shallow earth magnetite saturation during the later stages of fractionation. Wewhere they can effectively map things like regolith structure, interpret zones of high Ti and P as the upper parts of doleritepalaeochannels, and aquifers. This mapping is typically done sills that fractionated in place during crystallisation. These zonesusing a smooth, 1D inversion beneath each fid. However, a are elevated in magnetite, have high susceptibility, dominatesmooth inversion potentially obscures structure, and could itself the magnetic response of the Fortitude North system and aidintroduce artefacts into the recovered models. A model with a FEBRUARY 2023 PREVIEW 110'