b'AEGC 2023Short abstractsPetrophysical characteristics of the Gawler Craton. gamma count. In the case of airborne radiometric we have robust procedures to calculate the in-situ source Tim Keeping1, Adrian Fabris1, George Gouthas1 and Simon Vanradiation strength already in place. Numerical modelling Der Wielen2 of natural gamma radiation with GEANT4 to examine the 1 Geologial Survey of South Australiapossibility of measuring soil density via radiometrics on an 2 Geoscience Australia airborne platform indicates it is possible to infer density from natural radiation. However, leached soil horizons and Magnetic susceptibility and density petrophysical values arevery saturated mediums may reduce the density estimate used by explorers to forward model deposits and invert 3Daccuracy substantially.models against magnetic and gravity potential field surveys. Interest in petrophysics has grown with the distinct magneticPractical education in data acquisition for and gravity profiles of IOCG deposits such as Olympic Dam and Carrapateena within the Gawler Craton. The Department forgeophysicists.Energy and Mines (DEM) endeavours to collect and distributeAnton Kepicmagnetic susceptibility and density data to enable better exploration in South Australia. In this era of remote learning and virtual environments how 83 000 petrophysical measurements were collected fromdo we teach and learn data acquisition in a practice way. historical reports or measured at the DEM Core Library forA long-standing suggestion by our traditional providers of various projects such as the Eastern Gawler IOCG/Woomeraeducation, the Universities, is to embed or emplace students Prohibited Area 3D model. These values were then filteredin an industry practice environment. Especially as the to sample locations with both a density and magneticUniversities generally lack modern geophysical equipment susceptibility value to produce statistics profiling stratigraphicor the people with experience to demonstrate the units across the Gawler Craton. equipment and perform demonstrations. Often, we simply lack these sorts of geophysicists in universities, where at Stratigraphic units with large statistical variance were matchedbest one or two academic specialists may reside. The ability with intersecting solid geology domains of corresponding ageof industry to assist varies greatly with the booms and bust to assess if statistical constraints could be improved. The Gawlercycles and people willing to volunteer their time. Generally, Range Volcanics (GRV) intersects five domains, of which two canit is not sustainable.be separated by their distinct histograms. The remaining threeThe lack of modern equipment is less of an issue when it comes overlap but further subsets could be made according to theto learning fundamentals from my own experience, as the extent of interest. best field laboratories usually start with very basic, seemingly Olympic Dam petrophysics was provided by BHP Australiacobbled together, geophysical measurement systems. In as part of a parallel HyLogger spectral mineralogy project.physics education it is often said that the best learning comes This large paramagnetic data set demonstrated the statefrom putting together something such as a bicycle. Ditto for archives previous lack of IOCG petrophysical information. Plotsgeophysics, where putting together a basic resistivity system demonstrate Fe and Cu trends within the deposit and whereor seismic system block-by-block works wonders in learning select HyLogger identified minerals occur in association withinpitfalls and understanding in data collection. A suggestion for Fe mineralisation. our modern practical education and learning in geophysics today is to provide relatively inexpensive, and safe, kits to the The final report from DEM will contain histograms, scatterlearner with basic instruction to explore how to measure and (Henkel) plots and tables of statistics for 128 stratigraphic units,solve practical problems. I present a soution to this education 11 ranges of IOCG mineralisation, 19 HyLogger identifieddilemma based upon experience gathered over two decades IOCG minerals and 16 geological basement domains across theof teaching field and acquisition geophysics together with the Gawler Craton. evaluation of new general purpose electronics and software. A solution that provides a vision for how practical education and How to infer soil density from radiometric data. learning of geophysical acquisition oriented towards problem solving may be done without dedicated laboratory facilities or Anton Kepic modern production equipment. Perhaps a new generation of entrepreneurs too.Current practice in radiometric data analysis seems to have largely ignored using the Compton scattered gamma rays to characterise the very near surface, the soil horizon. TheSeismic while diamond drillingemphasis is upon the line spectra from radioisotope decay and removing or stripping out the scattered radiation fromAnton Kepic, Duy Thong Kieu1, Ry Zawadzki2 and Benjamin the parent and daughter product line source radiationCrettenden2for geochemical analysis. These radiation lines in the1 Institute of Geological Sciences (IGS), Academy of Science & gamma spectrum are the gamma rays that do not interactTechnology (VAST), Viet Nam with the other elements in the soil. Only the scattered2 Boart Longyearradiation provides us with a means to characterise physical properties so the soil. Thus, if we want to infer soil densityWe have performed tests at the Boart Longyear drilling test site then we should analyse the scattered gamma radiationat Brukunga, South Australia, with grouted geophone sensor from the Compton spectrum as it is done with boreholestrings in nearby drillholes that demonstrate the feasibility density tools. With borehole tools a strong and calibrated- of using diamond drilling process as a source to gather high known gamma source is used to normalise the Comptonquality seismic velocity data in the earth. These geophone 109 PREVIEW FEBRUARY 2023'