Utilising high-quality geophysics to see through the covered Nullabor Plain
Geophysical Cover Characterisation
A key component of improving mineral exploration under cover is to improve mapping of the thickness and character of cover through geophysical imaging and prediction into data sparse areas. In order to test cost-effective cover-thickness determinations, GA and GSSA trialled passive seismic, reflection seismic, magnetotelluric (MT) and micro-gravity methods over the Nullarbor Plain. The objective of the Geophysical Cover Characterisation project was to assess the technical capability of these techniques to map cover-thickness over the Eucla region, particularly in areas of deep cover and karstic limestones, and to assess the micro-gravity technique to image large cavities within the karst.
PACE Copper Coompana Gravity Survey
The PACE Copper Coompana Gravity Survey comprises over 13,000 new gravity observations in the state’s far west. The area is largely underexplored and these data provide new insight into the underlying geology, with implications not only for the exploration community both locally and throughout South Australia, but also the economy of South Australia. The Coompana area is prospective for Gold, Nickel, and Copper, and Exploration work in the area is currently being undertaken by Oz Exploration Pty Ltd.
The PACE Copper Coompana Gravity Survey dataset (survey code 2017A1) is available for download via the South Australian Resources Information Gateway (SARIG)
Coompana magnetic and radiometric survey
A free workshop of the latest insights from deep seismic and magnetotelluric profiling.
The western Gawler Craton and basement to the Eucla Basin are some of the last truly underexplored green-field terrains in South Australia. Located under shallow to thick cover adjacent to the Southern boundary of the Woomera Prohibited Area, the regions present a significant opportunity to open up new ground for exploration in the state and to probe methods for exploring through cover.
New deep crustal seismic section (13GA-EG1), together with new gravity and magnetotelluric data, has been captured from Tarcoola in South Australia to Haig in Western Australia. These 834 kilometres of continuous data will help open up new opportunities for explorers in South Australia and stimulate mineral exploration investment in the states underexplored west.
The survey is a collaborative project between the Geological Survey of South Australia, the Geological Survey of Western Australia, Geoscience Australia and AuScope Earth Imaging, with funding in South Australia provided through the PACE initiative.
Due to the length of the survey line, the data has been processed and released in a number of batches. This first section of the line covered the western Gawler Craton, covering ~360 km from near Cook to Tarcoola in the central Gawler Craton. The data for this segment (13GA-EG1E) is available to download now in SEGY format (unmigrated field stacks and migrated data). Also available are the results of collaborative interpretations of the seismic and magnetotelluric data presented at the ‘What lies beneath the western Gawler Craton? 13GA-EG1E Seismic and Magnetotelluric Workshop 2015’, which includes an extended abstract volume (Report Book 2015/00029) and poster sized image of the interpretations.
The remainder of the seismic and magnetotelluric line, including the Coompana Province and Madura Province, has been processed and was released at the Australian Earth Sciences Convention (AESC) in June 2016.What lies beneath the western Gawler Craton? 13GA-EG1E Seismic and Magnetotelluric Workshop 2015. Extended abstracts. RB 2015/00029
For more information, contact:
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