Reducing exploration risk
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- Coompana magnetic and radiometric survey
- Eucla-Gawler seismic survey
- Eastern Musgrave Province gravity survey
To promote mineral exploration within the state, the South Australian Government has undertaken major airborne and ground based geophysical surveys in key areas of the State.
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
A total of 821 readings were collected at 2km spacing along existing roads and tracks. This work was performed in conjunction with the ongoing Geological Survey of South Australia (GSSA) Musgrave Province mapping programme. Previous coverage was historical 7km x 7km coverage, collected in the 1960s and 1970s.
The survey has been designated the code 2014A1 for incorporation into the South Australian government geoscience database SA_Geodata, and is downloadable through SARIG using the Geophysical Data Downloads tool.
The survey summary Report Book: Gravity Survey 2014A1 AGNES CREEK, ALCURRA, and TIEYON 1:100 000 map sheets. RB 2014/00018
This detailed gravity survey was proposed by the Geological Survey of South Australia (GSSA) to deliver a vital new precompetitive dataset for explorers targeting Olympic Dam style Iron Oxide Copper Gold (IOCG) mineralisation within the Gawler Graton.
The survey sees 34,541 new gravity measurements added to the state Gravity database at 1km x 1km resolution, except within the continual use zone of the Woomera Prohibited Area (WPA) where resolution is 2km x 2km.
The gravity survey provides new, pre-competitive data that more clearly defines broad geology and structure in deeply covered areas within the Gawler Craton, and is of sufficient resolution to detect large-scale IOCG systems.
The WPA Gravity Survey (2013A01_GRAV_DS) is available for download through the Geophysical Data Downloads tool in SARIG.
The Marree Magnetic and Radiometric Survey provides 131,437 line km of new magnetic and radiometric geophysical data within an area of approximately 45,000 square km, situated to the north of the Flinders Ranges.
The majority of magnetic coverage in this area is historical data from 1961-66 at a spacing of 3.2 km or greater. There is little to no radiometric coverage.
The new, high quality magnetic data is of a resolution that clearly delineates sub-surface geological features which are important exploration criteria used for targeting a range of commodities, including sandstone hosted uranium.
The Marree magnetic and radiometric surveys (2013SA001) are available for download through the Geophysical Data Downloads tool in SARIG.
For more information, contact:
+61 8 8463 3000