b'AEGC 2023Short abstractsdata across the Delamerian Orogen in northwest Victoria andconstrain the interpretation of the electrical geophysical southeast South Australia. datasets. The electrical geophysical datasets inform solute transport dynamics by providing spatially-rich information Broadband MT data is collected at a nominal 3-4 km site spacingunobtainable from point-based measurements. Calibration of along a 750 km-long profile from the Spencer Gulf in Southhydrological models using the electrical geophysical datasets Australia to Pinnaroo on the Victorian-South Australian border,as proxies of changes in solute concentration provides and across the Murray Basin from Murray Bridge to Swan Hill inunique insights into the role of preferential flow in providing Victoria. groundwater-sourced nutrient inputs to drainage ditches The GSV-GSSA MT survey augments a wider programme offrom agricultural fields.regional pre-competitive geoscience acquisition planned for the region in collaboration with Geoscience Australia andIntegrated approach for downhole geophysical data MinEx CRC. Acquisition includes deep crustal reflection seismic, ground gravity and airborne electromagnetic surveys underinterpretation: Advanced characterisation using the national Exploring For The Future programme and GSSA- borehole magnetic resonance, acoustic televiewer led drilling in South Australia as part of the National Drillingimages and core data.Initiative.Lena Thrane 1 Laura Phillips2, Richard Toll, Jordan McGlew1, The new models will augment and further refine publiclyJonathan Ross and Ruslan Nuriakhmetov 1available AusLAMP MT models of the region (e.g. Delamerian AusLAMP survey through the GSSA SARIG portal). The new1 OREIntel data and models will provide electrical constraints to improve2 Newcrest Limited understanding of the regional geology and structuralIn recent years, advanced wireline logging technology has architecture of the Delamerian Orogen and its eastern boundarybecome more readily available to the minerals industry. While with the Lachlan Orogen. borehole imaging and magnetic resonance tools have been commonly used in oil and gas for decades, these techniques Electrical imaging of solute transport dynamics tohave real applications in mining and exploration contexts as understand nutrient transport from flat agriculturalwell such as for geotechnical and hydrogeological studies.landscapes. An integrated approach to data analysis and interpretation can provide a robust range of answer products that using Joshua Thompson1 Anthony Buda2, Amy Shober3, Johnone method alone could not. Borehole magnetic resonance Triantafilis4, Dimitrios Ntarlagiannis, Amy Collick5, Caseyprovides a range of hydrogeological products including Kennedy2, Lauren Mosesso3 and Lee Slater 1 total porosity, permeability and hydraulic conductivity in a 1 Rutgers University Newarkcontinuous log. Acoustic televiewers contribute a structural 2 United States Department of Agricultureinterpretation and geomechanical evaluation and cores offer 3 University of Delawareground truth. While the individual techniques have their 4 Manaaki Whenua/Landcare Researchstrengths, combining methods together, with conventional 5 Morehead State Universitydownhole geophysics, enables valuable intel for resolving orebody complexity. Linking various data sources provides Electrical and electromagnetic geophysical techniquesan accurate classification of geological features and are increasingly used to capture the dynamics of solutedifferentiation of open and closed fractures, as well as insights transport in the shallow subsurface. Three-dimensionalinto anticipated aquifer properties.electrical imaging, one-dimensional (1D) resistivity profilingWhile sharing a common goal, quite often there is a limited and frequency domain electromagnetic (EM) techniquesoverlap between geotechnical and hydrogeological studies. The were used to investigate solute transport, including possiblenovel interpretation practice coupled with quantitative data activation of preferential flowpaths, at an artificially-drainedprovides benefits to all stakeholders:site located on a flat agricultural landscape where excess nutrients discharge into drainage ditches. A saline tracerAccurate features classification (open vs closed, naturally was injected into the saturated zone at a rate previouslyoccurring vs drilling-induced)determined to limit groundwater mounding. Subsequently,Enhanced geological interpretation and lithology a sprinkler system was used to simulate a 25-year, 12-houridentification (combining core interpretation with downhole storm event (~ 120 mm). Repeated 1D resistivity profilingimagery and measurements)was used to quantify infiltration through the upper 1.5Improved core orientation at surface, using the in-situ m of unsaturated zone. A fan array of 96 electrodes,oriented image logsdesigned to accommodate simulated solute transportImproved data coveragefilling data gaps due to core loss from hydrogeological modeling, was used to acquire 3Dusing logselectrical imaging monitoring datasets during lateralDirect measurement of the amount of water in the rock transport occurring within the saturated zone. Shallow EMmass (porosity) with the ability to interpret both bound and measurements were performed prior to tracer injectionmoveable waterand at the end of the electrical monitoring to furtherHydraulic parameters calculation (Hydraulic Conductivity)validate the extent that the tracer traveled beyond the injection well. Supporting hydrological datasets, includingThe synergies that emerge from integrating various data measurements of specific conductance and hydraulic headsources play a key role in resolving the complexity of natural from multiple shallow monitoring wells, were used todeposits and mobilising the scarce georesources sustainably.145 PREVIEW FEBRUARY 2023'