Minerals Alert July 2010

  1. New Magnetic Anomaly Grid of Australia (5th edition) released
  2. New ASTER Geoscience GIS products now available for the Gawler-Curnamona region in South Australia
  3. Release of Survey Data - Gawler-Officer-Musgrave-Amadeus Seismic Survey, South Australia
  4. Results from Eastern Goldfields Superterrane - Western Australia
  5. Airborne electromagnetic data and models for the Pine Creek region, Northern Territory
  6. Science at the Surveys: Geoscience Australia presentation
  7. National Geochemical Survey of Australia update
  8. New Seismic Survey - Youanmi Seismic and MT Survey, Western Australia
  9. New 1.1 million scale Surface Geology of Australia
  10. Update on geophysical data releases
  11. About Minerals Alert

1. New Magnetic Anomaly Grid of Australia (5th edition) released

The gridded digital data that comprises the 5th edition of the Magnetic Anomaly Map of Australia were released by Geoscience Australia on 1 July 2010. The new magnetic anomaly grid is available from the Geophysical Data Delivery System (GADDS) which contains an additional 115 survey grids since the 4th edition was released in 2004. New independent airborne total-field magnetic data acquired in 2007 during a continental calibration survey flown as part of Geoscience Australia's Onshore Energy Security Program have been used to increase the accuracy of intermediate wavelengths. The method of matching the individual survey grids also has been updated and 795 individual grids have been matched and merged into the continent-wide grid. These grids include data from many new surveys, acquired mainly by the State and Northern Territory Geological Surveys. It is estimated that 27 million line-kilometres of survey data were acquired to produce the grid data, eight million line-kilometres more than for the 4th edition of the Magnetic Anomaly Map of Australia.

For further information, email murray.richardson@ga.gov.au; or phone +61 2 6249 9229.

2. New ASTER Geoscience GIS products now available for the Gawler-Curnamona region in South Australia

Geoscience Australia, in collaboration with CSIRO and Primary Industries and Resources South Australia (PIRSA), is releasing a suite of 14 new ASTER mosaic products for a significant part of the Gawler-Curnamona region in South Australia. About 110 ASTER scenes have been included in a mosaic and processed into geoscience products which can be quickly and easily integrated with other datasets in a GIS. The products have been pre-processed and calibrated with available HyMap data and provide basic mineral group information such as ferric oxide abundance and AlOH group distribution as well as mosaiced and levelled false colour and regolith ratio images. These images, along with accompanying notes, are available from the Gawler-Curnamona ASTER project website.

For further information, email matilda.thomas@ga.gov.au; or phone +61 2 6249 9219.

3. Release of Survey Data - Gawler-Officer-Musgrave-Amadeus Seismic Survey, South Australia

During November and December 2008, 634 kilometres of seismic reflection and gravity data were acquired in a continuous north-south traverse beginning near Erldunda in the Northern Territory and finishing near Tarcoola in South Australia (08GA-OM1). The traverse follows the Alice Springs to Adelaide railway and was jointly funded by Geoscience Australia through the Onshore Energy Security Program, AuScope and Primary Industries and Resources South Australia (PIRSA). The uninterpreted processed seismic data for the Gawler-Officer-Musgrave-Amadeus survey is now available.

For further information, email jenny.maher@ga.gov.au; or phone +61 2 6249 9896.

4. Results from Eastern Goldfields Superterrane - Western Australia

A new Geoscience Australia report, Applications of Potential Field Methods over the Eastern Goldfields Superterrane (EGST) of Western Australia, documents geophysical activities and results from studies of the eastern goldfields by the various projects of the Predictive Mineral Discovery Cooperative Research Centre (pmd*CRC). Previously, these results were available only in unpublished pmd*CRC reports.

For further information, email richard.blewett@ga.gov.au; or phone +61 2 6249 9713.

5. Airborne electromagnetic data and models for the Pine Creek region, Northern Territory

New airborne electromagnetic (AEM) data and inversion products have been released for the Woolner and Rum Jungle areas of the Pine Creek region in the Northern Territory. The data were acquired using the TEMPEST AEM system during 2008-09 and cover 43 200km2 between Darwin and Katherine. The VTEM AEM data for the Kombolgie area flown during the same survey will be released in the coming months. These final two data releases make most of the contractor supplied data publicly available (including previously confidential detailed infill data) as well as new conductivity sections, grids and images derived by Geoscience Australia from layered earth inversion of the AEM data. Significant deposits located within the survey area include Rum Jungle (base metals), Cosmo Howley (Au), Browns (base metals), Woodcutters (base metals). A free download is available of the Pine Creek TEMPEST AEM Survey, Northern Territory, 2010 Final Inversion Data and Conductivity Models.

For further information, email nick.williams@ga.gov.au; or phone +61 2 6249 5807.

6. Science at the Surveys: Geoscience Australia presentation

On 22 March 2010, Geoscience Australia and the State Geological Surveys held the Science at the Surveys seminar in Melbourne immediately prior to the Australian Mineral Industry Research Association (AMIRA) Exploration Managers meeting. A presentation to the seminar by one of Geoscience Australia's Senior Geophysicists, Richard Lane, titled Developments and directions in 3D mapping of mineral systems using geophysics is now available.

For further information, email richard.lane@ga.gov.au; or phone +61 2 6249 9264.

7. National Geochemical Survey of Australia update

The National Geochemical Survey of Australia (NGSA) aims to produce the first geochemical atlas of Australia based on the multi-element analysis of transported regolith samples collected at the outlet of large catchments covering most of the continent. The project, which is funded by the Onshore Energy Security Program and the States and Northern Territory Geological Surveys under a collaborative National Geoscience Agreement, started in January 2007. Recent progress includes:

  • sample collection has closed, with 86% of the targeted sites sampled
  • sample preparation is finished
  • sample analysis is nearing completion
  • sample analysis methods have been documented in the National Geochemical Survey of Australia: Analytical Methods Manual
  • the release of project outputs (geochemical maps and dataset, reports) is planned for June 2011.

More information on the project and a map of final sampling sites can be found on the NGSA web page.

For further information, email patrice.deCaritat@ga.gov.au; or phone +61 2 6249 9378.

8. New Seismic Survey - Youanmi Seismic and MT Survey, Western Australia

The Youanmi deep crustal survey commenced on the 21 May 2010 and is a collaborative project between Geoscience Australia and the Geological Survey of Western Australia (GSWA). Reflection seismic, gravity and magnetotelluric data will be acquired overthree traverses, totalling 677 kilometres, crossing the Youanmi Terrace and Eastern Goldfields Superterrane of the Yilgarn Craton.

For further information email jenny.maher@ga.gov.au; or phone +61 2 6249 9896.

9. New 1.1 million scale Surface Geology of Australia

A new edition of the 1:1 million scale Surface Geology of Australia dataset has successfully combined the previously individual State and Territory datasets into a single, seamless, national digital dataset.

The data is available through Geoscience Australia's online mapping application, MAPCONNECT.

Up to one-third of the entire continent's geology can be viewed, queried, plotted and downloaded along with topographic map data from the online mapping tool in one session.

However, the entire seamless 1:1 million scale dataset is too large for a single download, and is available on DVD.

The 2010 dataset, which updates the stratigraphic and descriptive geological information from the previous 2007 and 2008 editions, is available in ESRI Geodatabase, Shapefile and Mapinfo formats.

For further information email oliver.raymond@ga.gov.au; or phone +61 2 6249 9575.

10. Update on geophysical data releases

The current status of Geoscience Australia's geophysical survey data acquisition is now available in a comprehensive table.

The Eucla Basin 2 (Loongana), Eucla Basin 5 N (Forrest), South Officer 1 (Jubilee) airborne magnetic and radiometric survey all commenced in June 2010.

For further information, email murray.richardson@ga.gov.au; or phone +61 2 6249 9229.

11. About Minerals Alert

For more information contact Mike Huleatt on +61 2 6249 9087 or email mike.huleatt@ga.gov.au.

To view past editions of Geoscience Australia's Minerals Alert, visit the Minerals Alert Newsletter Archive.

Topic contact: media@ga.gov.au Last updated: October 4, 2013