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Recognising the impact of uncertainty in resource models
- Publication Name: AEGC 2021
- Authors: Steve Sullivan
- Date Published: September 2021
Abstract:
The research aimed to test the variability of geological modelling due to the interpretation bias of the person building the model. Measuring this innate uncertainty in modelling allows stakeholders to have confidence in the models, knowing the level...
Australian Proterozoic Thermal Aureole Gold Mineral Systems: the Critical Role of High Crustal Geothermal Gradients and the Insights of Vic Wall
- Publication Name: AEGC 2021
- Authors: Lesley Wyborn
- Date Published: September 2021
Abstract:
Thirty years ago, Wall (1990) proposed the name ‘Thermal Aureole Gold (TAG)’ for a distinctive class of plutonrelated gold deposits (now more commonly known as Intrusion-related Gold (IRG)). Initially based on the Pine Creek, Tanami and Paterson ...
Maximising the value of high-definition 3D coal seismic data
- Publication Name: AEGC 2021
- Authors: Margarita Pavlova, Matt Grant, Tim Dean
- Date Published: September 2021
Abstract:
The acquisition of seismic data over coal mining leases in Queensland’s Bowen Basin first commenced over 30 years ago. Since then, coal seismic data has been predominantly utilised for structural interpretation, particularly fault delineation. In t...
UAV Magnetic Survey Planning, QAQC and Data Processing
- Publication Name: AEGC 2021
- Authors: Brett Adams, James Jensen, Brendan Ray
- Date Published: September 2021
Abstract:
UAVs have been deployed increasingly to collect magnetic data, however acquisition using these systems often lack QAQC checks that are typically expected from fixed-wing or helicopter-based acquisition. Furthermore, survey parameters such as line spa...
Results from the largest Airborne Electromagnetic (AEM) survey ever flown in NSW
- Publication Name: AEGC 2021
- Authors: Astrid Carlton, Liann Deyssing, et al.
- Date Published: September 2021
Abstract:
The Geological Survey of New South Wales (GSNSW) has mapped potential mineral and groundwater features, and the depth of intense weathering by interpreting a large airborne electromagnetic (AEM) dataset in Central NSW....
Application of passive seismic for exploration in the Palaeozoic basement underneath Tertiary basalts, western Tasmania
- Publication Name: AEGC 2021
- Authors: Chuang Wang, Gerrit Olivier, Martin Jutzeler
- Date Published: September 2021
Abstract:
Over the last two decades, ambient seismic noise (or background vibrations) have been successfully used with seismic interferometry to gain information on the subsurface without the need of an active source such as a vibrating truck or explosion. The...
drillGEO: Designing a Magnetic Resonance Logging-While-Drilling Tool for Minerals Exploration
- Publication Name: AEGC 2021
- Authors: Keelan O’Neill, Sravani Mukkisa, Michael Johns, Timothy Hopper
- Date Published: September 2021
Abstract:
drillGEO is a magnetic resonance (MR) logging-whilstdrilling (LWD) tool targeted at the minerals exploration industry. drillGEO allows real-time geological assessment during reverse-circulation (RC) drilling. Magnetic resonance logging captures the p...
An inventory of peralkaline rocks in Queensland for evaluation of REE enrichment potential
- Publication Name: AEGC 2021
- Authors: David Purdy, Bob Bultitude, Dominic Brown
- Date Published: September 2021
Abstract:
Highly fractionated peralkaline rocks are globally important sources of rare earth elements and other critical or new economy metals. Such metals are vital for technological advancement and a transition to a clean energy future and are therefore pred...
Digitalizing the Mining Industry – 3D Scanning of Core Trays to Produce Volumetric Bulk Densities
- Publication Name: AEGC 2021
- Authors: Mikael Artursson, Angus Tod, Emma Dellar, Annelie Lundström
- Date Published: September 2021
Abstract:
Geological drill core samples can be digitalized using the Minalyzer Core scanner. Data sets generated from this scanning include XRF geochemistry, high-resolution images, specific gravity, RQD, structural logging, and sample topography. While all th...
The evaluation of alternatives to pre-acquisition surveying for land seismic surveys
- Publication Name: AEGC 2021
- Authors: Tim Dean, Matt Grant
- Date Published: September 2021
Abstract:
Accurate positioning for sources and receivers is a fundamental requirement for land seismic survey acquisition. The introduction of ‘stake-less navigation’ systems, where the vibrator driver uses a GPS guided display to navigate into position, h...
How to enhance Magnetotellurics resistivity model resolution using passive seismic HVSR to identify the cover-basement interface
- Publication Name: AEGC 2021
- Authors: Nuwan Suriyaarachchi, Jeremie Giraud, Hoel Seille, Mark Lindsay, Vitaliy Ogarko, Lachlan Hennessy, Mark Jessell
- Date Published: September 2021
Abstract:
Magnetotelluric (MT) and the passive seismic Horizontal to Vertical Spectral Ratio (HVSR) methods are commonly used to characterize cover thickness. While MT is sensitive to resistivity contrasts in the subsurface, the MT data inversion process is af...
Using modern downhole EM to discover high-grade, narrow vein lodes in a historical gold field, Bellevue Gold Project, Western Australia
- Publication Name: AEGC 2021
- Authors: Anne Tomlinson, Greg Maude
- Date Published: September 2021
Abstract:
With the recommencement of exploration in 2017 by Bellevue Gold Limited at the historical Bellevue Gold Mine in the Agnew-Wiluna greenstone belt, a review of the historical geophysical datasets was undertaken. This included remodelling of downhole EM...
Microbial methane production in the Surat Basin, Queensland
- Publication Name: AEGC 2021
- Authors: B.C. Campbell, Se Gong, P. Greenfield, D.J. Midgley, I.T. Paulsen, S.C. George
- Date Published: September 2021
Abstract:
A large proportion of the methane found in coal seams is produced by microbial communities. Despite coal seam methane being a valuable resource for human energy security, the processes employed by these microbes in the production of methane are still...
How do detachment properties influence the kinematics of normal growth faults? Insights from 3D seismic reflection data from the Ceduna sub-basin
- Publication Name: AEGC 2021
- Authors: Monica Jimenez, Simon Holford, Rosalind King, Mark Bunch
- Date Published: September 2021
Abstract:
The growth of gravity-driven normal faults exerts a critical control on multiple elements and processes of the petroleum system. However, there is still a poor understanding of the interactions between the properties of detachment layers and the evol...
Integration of high-resolution HyLogger3 spectral scanner and TESCAN Integrated Mineral Analyser for mineralogical characterisation of shale
- Publication Name: AEGC 2021
- Authors: Muhammad Atif Iqbal, Reza Rezaee, Gregory Smith, Hasnain Ali Bangash
- Date Published: September 2021
Abstract:
The mineralogy of shales is a fundamental parameter because it directly influences petrophysical and geomechanical properties. However, thick shales comprise a heterogeneous succession of very fine-grained strata in which only some thin beds are opti...
Northern Lawn Hill Platform – modelling the ‘great-grandparent’ emerging region
- Publication Name: AEGC 2021
- Authors: Tehani Palu, Amber Jarrett, Susannah MacFarlane, Christopher Boreham, Barry Bradshaw
- Date Published: September 2021
Abstract:
The northern Lawn Hill Platform (nLHP) of the Isa Superbasin, far northwest Queensland is currently considered an emerging region and is an area of renewed interest for unconventional gas. Petroleum systems analysis presented here will improve the un...
Magnetic characterisation of the Osborne IOCG: magnetic fabrics, self-demagnetisation, and remanence: Cloncurry District, QLD
- Publication Name: AEGC 2021
- Authors: Andreas Bjork, Jim Austin, Helen McFarlane
- Date Published: September 2021
Abstract:
Integrated petrophysics linked with structural geology and mineralogy are powerful tools for mineral system characterisation. In this study, open-pit samples and drill core from the Osborne IOCG deposit were measured for anisotropy of magnetic suscep...
Reversible Jump Sequential Monte Carlo for Model Inference in Airborne Induced Polarisation
- Publication Name: AEGC 2021
- Authors: Laurence Davies, Christopher Drovandi, Matthew Sutton, Alan Yusen Ley-Cooper
- Date Published: September 2021
Abstract:
Exact methods of Bayesian model selection require exhaustive computation of normalising constants or sampling of the joint posterior of parameters and models via reversible jump Markov chain Monte Carlo (RJMCMC). Until recently, the latter has been f...
Earthquake monitoring in the Southwest Seismic Zone, Western Australia
- Publication Name: AEGC 2021
- Authors: Ruth E Murdie, Lucy Brisbout, Hugh Glanville, Trevor Allen, Vic Dent
- Date Published: September 2021
Abstract:
The southwest Yilgarn Craton, in Western Australia is one of the most seismogenic areas of mainland Australia. There are many small earthquakes happening daily and the occasional larger earthquake such as the destructive Meckering (M6.6) earthquake o...
The North Australian Craton 3D Gravity and Magnetic Inversion Models – A trial for first pass modelling of the entire continent
- Publication Name: AEGC 2021
- Authors: James A Goodwin, Richard J L Lane
- Date Published: September 2021
Abstract:
As part of the Federal Government’s Exploring for the Future program, whole-of-crust 3D gravity and magnetic inversion models have been produced for an area encompassing the North Australia Craton (NAC). These models were created to aid 3D geologic...
The Winu-Ngapakarra deposit in the Great Sandy Desert of Western Australia, a Neoproterozoic Intrusion-related Cu-Au-Ag deposit
- Publication Name: AEGC 2021
- Authors: Hilke Dalstra, Adam Black, Inna Mudrovska
- Date Published: September 2021
Abstract:
The Winu Cu-Au-Ag deposit was discovered in late 2017 and is hosted in metamorphosed sandstones and siltstones and lesser mafic rocks which are most likely correlatives of the upper Malu Formation of the Yeneena Basin. The deposit structure is domina...
In-situ stress pattern along the Jellinbah Fold Thrust Belt in the Bowen Basin, Australia
- Publication Name: AEGC 2021
- Authors: Saswata Mukherjee, Mojtaba Rajabi, Joan Esterle, Renate Sliwa
- Date Published: September 2021
Abstract:
The Permo-Triassic Bowen Basin hosts numerous thick coal seams, and it is a prolific basin for coal mining and gas production. The development of coal seam gas (CSG) reservoirs in different parts of the Bowen Basin emphasizes the potentiality of the ...
How deep does ground EM see?
- Publication Name: AEGC 2021
- Authors: Andrew Fitzpatrick, Mike Whitford, Antonio Huizi
- Date Published: September 2021
Abstract:
Nickel exploration routinely utilises electromagnetic techniques as a direct detection tool. In the Australian context, conductive regolith dominated terrains reduces the depth of penetration of electromagnetic techniques. Modelling is typically perf...
Quantifying Uplift using Decompaction: A case study from the Exmouth Plateau, North West Shelf
- Publication Name: AEGC 2021
- Authors: Patrick Makuluni, Laurent Langhi, Juerg Hauser, Stuart Clark
- Date Published: September 2021
Abstract:
Uplift events have caused the failure of hydrocarbon seals resulting from subsequent deformation and fault development or reactivation. On the other hand, escaping hydrocarbons from the breached seals may accumulate in new traps, and fracturing of br...
AIP EFFECTS IN AIRBORNE EM FIXED WING SYSTEMS: A SPECTREM THEORETICAL STUDY.
- Publication Name: AEGC 2021
- Authors: Andrea Viezzoli, Francesco Dauti, Nirocca Devkurran, Brad Pitts
- Date Published: September 2021
Abstract:
IP effects can distort airborne EM data, usually producing faster decays and, under certain conditions, changes in signal polarity. These effects, if not recognized and treated with a dispersive resistivity model, often lead to artefacts in the resis...
Probabilistic modelling of groundwater salinity using borehole and airborne electromagnetics (AEM) data
- Publication Name: AEGC 2021
- Authors: Neil Symington, Anandaroop Ray, Chris Harris-Pascal, Kok Piang Tan, Richard Taylor, Yusen Ley-Cooper, Ross C Brodie
- Date Published: September 2021
Abstract:
Groundwater is a critical resource for supporting human consumption, stock water, agricultural use, and mineral or energy extraction as well as the environment. However, the quality of groundwater varies enormously from potable to hyper-saline, parti...
Investigation of old pollution site along the Swan River, Perth, Western Australia using Loupe TEM system
- Publication Name: AEGC 2021
- Authors: Michael A. Hatch, Greg Street, Gavan McGrath, Aaron Davis, Andrew Duncan
- Date Published: September 2021
Abstract:
In this study, data were collected using a new transient-electromagnetic system over an area in Perth, Western Australia, along the Swan River. The site was polluted by industry in the 1960’s and 1970’s, and then remediated by agencies working fo...
Closing the gap between ground and airborne IP data modelling
- Publication Name: AEGC 2021
- Authors: A. Viezzoli, G. Fiandaca
- Date Published: September 2021
Abstract:
Modelling of Induced Polarization in AEM data (AIP) has recently been used more often in exploration. Which demands for more research to address the fundamental question “how does AIP compare to ground IP?”. Beside some of the well-known differen...
New Age Dating of Evaporites in Canning Basin, WA, Australia. A Case Study based on samples from the Frome Rocks Salt Diapir
- Publication Name: AEGC 2021
- Authors: F. McNee, J. Gorter, F. Glass
- Date Published: September 2021
Abstract:
The age of evaporitic units in the Kidson Sub-basin of the Canning Basin have been assigned to be of Late Ordovician to Early Silurian age through the dating of the sedimentary sequences within the Mallowa Salt.
This paper presents an alternative m...
Expanding the reserve base of operating mines: Insights from an airborne MobileMT survey in the Omsukchan depression, Russian Far East
- Publication Name: AEGC 2021
- Authors: Petr Kordi, Alexander Prikhodko, Andrei Bagrianski, Sergei Trushin
- Date Published: September 2021
Abstract:
In the frame of expanding the reserve base for the Omsukchan mining district, an airborne electromagnetic survey was carried out over and around the Dukat silver giant. The initially developed exploration concept was based on weakly investigated deep...