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Legacy data – hidden opportunity
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Keith Reeves*
- Date Published: September 2019
Abstract:
As oil prices have rebounded, operators look for new exploration opportunities. A new paradigm, however, is the increased focus on investor return rather than relentless expansion at all costs. This value-focused exploration looks for cost effective ...
DHEM at Las Cruces, Spain – successes and failures
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Gavin R. Selfe*
- Date Published: September 2019
Abstract:
Downhole electromagnetic (DHEM) logging was undertaken within four holes drilled at the Las Cruces VMS body in Spain. The geology of the deposit is geophysically complex inasmuch as the background and overlying geology is conductive. A number of loop...
Target detectability in regional-scale AEM surveys
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: David Annetts*, Juerg Hauser
- Date Published: September 2019
Abstract:
Direct detection of drillable targets is among the primary goals of airborne electromagnetic surveys. As larger government-funded regional surveys move towards large (> 5 km) line spacings, it is natural to question the likelihood of such s...
The geology of the Brecknock, Calliance and Torosa gas fields, Browse Basin, Western Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Robert Seggie, Simon Lang, Neil Marshall
- Date Published: September 2019
Abstract:
The Brecknock, Calliance and Torosa (BCT) gas fields are located offshore approximately 425 km north of Broome, Western Australia. The fields have undergone an extensive appraisal drilling and seismic acquisition campaign between 2005-2012, with the ...
Indicator minerals for magmatic sulfide mineralisation
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Louise Schoneveld*, Steve Barnes, Margaux LeVaillant, Valentina Taranovic
- Date Published: September 2019
Abstract:
Small conduit or chonolith style intrusions dominated by olivine- and pyroxene-rich cumulates are well known to be favourable hosts to magmatic Ni-Cu-(PGE) sulfide mineralization. In many cases, such mineralization is closely associated with partiall...
Collaborating on pre-competitive geophysical projects in the Northern Territory, Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Tania Dhu, Angus McCoy, Ian Scrimgeour
- Date Published: September 2019
Abstract:
This paper reviews three different collaborative approaches that have been applied to acquire pre-competitive geophysical data in the Northern Territory. The collaborative structures involve the resource exploration industry, Northern Territory Geolo...
A high-resolution seismic investigation for shallow iron ore
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Ashley Grant*, Sasha Ziramov, Milovan Urosevic
- Date Published: September 2019
Abstract:
A high-resolution shallow seismic investigation involving a 3D-3C, 3D-1C, 19 zero-offset ZVSP and a 3D SWD was undertaken in an effort to image a subsurface iron ore deposit. The same project area was used in all of the surveys and was located in nor...
The effects of seismic anisotropy on mining seismology
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Andrew King
- Date Published: September 2019
Abstract:
Microseismics – the detection and characterisation of mining-induced fracture events in the rockmass – is widely used to improve geotechnical understanding of the rockmass response to mining, and for hazard assessment of rockbursts and roof falls...
Metasomatic/depletion events affecting Cratons and “cratons”
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Tom Wise*, Stephan Thiel, Rian Dutch, Mark Pawley, Kate Robertson
- Date Published: September 2019
Abstract:
We integrate seismic tomographic models and filtered gravity anomaly maps to investigate the compositional variations in the SCLM of Australia. We find zones of relative enrichment and depletion coinciding with the spatial extent of major thermal eve...
Augmenting 1D conductivity depth sections to include information pertaining to 2D/3D conductors
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Magdel Combrinck*
- Date Published: September 2019
Abstract:
Conductivity depth data presentations derived using 1D approximations have become a very popular way to present airborne electromagnetic (AEM) data. While data profiles and a single error limit per station can accompany these presentations there are ...
The power of the crowd and open data – learnings from the OZ Minerals Explorer open innovation challenge
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Holly Bridgwater*, Jess Robertson, Ian Anderson
- Date Published: September 2019
Abstract:
We report on the results and lessons learned from Australia’s largest minerals exploration crowdsourcing challenge - the OZ Minerals Explorer Challenge. We discuss some of the challenges in running an international competition with a large amount o...
Utilising potential field modelling to better inform on the 3D structural architecture in regions of excellent structural control
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Robin Armit*, Teagan Blaikie, Peter Betts, Laurent Ailleres
- Date Published: September 2019
Abstract:
Information in the third dimension is intrinsic to potentialfield data. Potential-field interpretations and modelling can provide crucial regional and sub-surface geological constraints in areas considered to be structurally ‘well’ understood. T...
A series of confusing measurements in the search for water
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Chris Wijns
- Date Published: September 2019
Abstract:
A mine development in the high Andes of north-western Argentina requires a supply of fresh water for various uses, the largest being mineral processing. Complementary survey techniques in a gravel basin have provided vastly different and sometimes co...
Structural Setting and Controls on Ni-Cu Sulphide Mineralisation at Nova-Bollinger, Fraser Zone, WA
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Jonathan Standing
- Date Published: September 2019
Abstract:
Nova-Bollinger is a structurally modified magmatic Ni-Cu sulphide deposit in which sulphide melt was mechanically extracted from chonolithic intrusions and concentrated into structurally controlled positions within the footwall country rocks. The fer...
The Foura Sandstone type section (Samaropollenites speciosus Zone, Carnian–early Norian; early Late Triassic), Timor-Leste: preliminary correlation between Timor and the Bonaparte Basin
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: D. Peyrot, M. Keep, J. Scibiorski, E. McCartain, P. Baillie, J. Soares, D.W. Haig, A.J. Mory
- Date Published: September 2019
Abstract:
The logging and biostratigraphic characterization of the Foura Sandstone type section, Timor-Leste, show it is Carnian–early Norian (Samaropollenites speciosus Zone). Sedimentary structures indicate a turbidite origin and petrographic analysis reve...
Subsurface characterisation for future CCS applications using uncommon 3D surface and borehole seismic survey geometries at Harvey, Western Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Milovan Urosevic, Sasha Ziramov*, Roman Pevzner, Konstantin Tertyshnikov, Sinem Yavuz, Anton Egorov, Andrej Bona, Valeriya Shulakova, Dominique Van Gent
- Date Published: September 2019
Abstract:
Within the South West Hub Project we conducted a comprehensive integrated study to map the fault and fracture network surrounding the Harvey 3 well to obtain an understanding of their propensity to act as conduits for the injected CO2. Her...
What lies beneath? A reflection on the porphyry copper exploration model
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Ken E. Witherly*
- Date Published: September 2019
Abstract:
Electrical methods have been applied to the search for porphyry copper and IOCG deposits since the early 1950s. While there is a generally accepted model of disseminated sulfides giving rise to a chargeability response, no clear association has been ...
An AI approach to automated magnetic formation mapping beneath cover
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: David A. Pratt*, K. Blair McKenzie, Anthony S. White
- Date Published: September 2019
Abstract:
Most regional scale magnetic maps are dominated by the magnetic characteristics of steeply dipping basement units truncated by an unconformity surface. It is easy to demonstrate that 80 to 90% of each total field magnetic anomaly is contributed by th...
Gold metallogeny of the northern Capricorn Orogen
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Imogen Fielding, Simon Johnson
- Date Published: September 2019
Abstract:
The timing and distribution of gold mineralization in Proterozoic orogens is influenced by crustal architecture which is often established long before gold mineralization occurs. Gold occurrences in such settings are commonly associated with crustal-...
Strategic electromagnetic geophysical prospecting across a belt – an example over the Albany Fraser Orogen
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Andrew Fitzpatrick*, Mike Whitford
- Date Published: September 2019
Abstract:
Nickel exploration routinely utilises electromagnetic (EM) techniques as a direct detection tool. Independence Group is currently exploring a large tenement holding in the Albany Fraser Orogen in Western Australia that contains its flagship Nova magm...
Maximising value from seismic using new data and information management technologies
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Jess B. Kozman, Matthew Holsgrove
- Date Published: September 2019
Abstract:
Geophysical data is one of the key decision support factors for successful discovery of hydrocarbons, and operators have multi-decadal inventories of survey data in key basins. Woodside has a history of exploration in Australia from 1954 and seismic ...
Structural controls of the Ernest Henry IOCG deposit: Insights from integrated structural, geophysical and mineralogical analyses
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Jim Austin, Andreas Björk, Ben Patterson
- Date Published: September 2019
Abstract:
Iron Oxide Copper-Gold deposits (IOCGs) are structurally controlled, and typically display zonation of iron oxides and sulphides, which is potentially related to redox zonation. There are three main factors that determine the location and architectur...
Using Corona to test NMR response of iron ore chip samples
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Mark Downey, Kazek Trofimczyk*
- Date Published: September 2019
Abstract:
The application of Nuclear Magnetic Resonance (NMR) to investigate the distribution of moisture in materials has not normally been applied to iron ores due to the magnetic properties of iron. However recent test work on blast hole chip samples of iro...
The lithospheric structure and deep processes of the Mesozoic mineral systems in east China: constrained from integrated geophysical data
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Qingtian Lü*, Guixiang Meng, Jiayong Yan, Jinhua Zhao, Xuejing Gong
- Date Published: September 2019
Abstract:
Financed by the SinoProbe, a national collaborative multidisciplinary Earth science research project in China, the authors has conducted multi-scale and integrated geophysical exploration across the middle and lower reaches of Yangtze Metallogenic Be...
Beyond chi-squared: Additional measures of the closeness of a model to data
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Alan G. Jones*
- Date Published: September 2019
Abstract:
Subtle, and not so subtle, features in our increasingly large and complex datasets are being missed because of our reliance on a single number, typically chi-squared based, to describe the distance between a plausible model and the data. Additional m...
Tectonic analysis of regional potential field data
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Peter Betts*, Robin Armit, Caroline Tiddy, Sheree Armistead, Laurent Ailleres
- Date Published: September 2019
Abstract:
This contribution uses several case studies to illustrate how regional aeromagnetic and gravity data is used to undertake tectonic analysis. Regional aeromagnetic and gravity data is a powerful tool for tectonic analysis because it can be interpreted...
Application of audio-magnetotelluric method to cover thickness estimation for drill site targeting
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Wenping Jiang*, Ross Brodie, Jingming Duan
- Date Published: September 2019
Abstract:
Cover thickness estimation is critical to mineral exploration effectiveness in covered terrains. Geophysical methods are able to detect physical properties contrasts in different earth materials without seeing them. We present the application of the ...
Overpressure transmission through igneous intrusions: An unrecognized drilling hazard in volcanic affected basins?
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Nick Schofield*, Simon Holford, Alex Edwards
- Date Published: September 2019
Abstract:
In situ overpressures in sedimentary basins are commonly attributed to disequilibrium compaction or fluid expansion mechanisms, though overpressures in shallow sedimentary sequences may also develop by vertical transfer of pressure from deeper basin ...
Understanding the variability of sedimentary basin’s gravity response through stratigraphic modelling
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Vincent Crombez*, Luk Peeters, Richard Chopping
- Date Published: September 2019
Abstract:
It is well known that inversions of gravity data are non-unique and this means that if one model can be found that fits data then there is also a set of alternative models that fit the data equally well. This non-uniqueness also extends to the choice...
Time lapse in-hole electrical resistivity surveying during a shallow release of CO2 gas: Harvey, Western Australia
- Publication Name: Australasian Exploration Geoscience Conference 2019
- Authors: Brett Harris*, Alex Costall, Hoang Nguyen, Karsten Michael, Ludovic Ricard, Barry Freifeld, Arsham Avijegon, Andrew Pethick
- Date Published: September 2019
Abstract:
An in-hole electrode array was installed and cemented behind a fibreglass casing in a vertical monitoring well as part of an in-situ laboratory test for CO2 migration in a shallow fault zone in Harvey, Western Australia. The array consiste...