Minerals Alert February 2006

  1. New Minerals Chief
  2. Simpler access to Minerals data, products, and conference information
  3. Iron oxide Cu-Au ore-forming systems of the Gawler Craton workshop, February 2006
  4. pmd*CRC Central Gawler Gold Province numerical modelling workshop, February 2006
  5. Update on geophysical survey data acquisition
  6. Update on recently released datasets - Two new products have been released from the Magnetic Database of Australia
  7. Mount Isa airborne geophysical datasets
  8. Significance of Devonian-Carboniferous igneous activity in Tasmania as derived from U-Pb SHRIMP dating of zircon
  9. Evolution and metallogenesis of the North Australian Craton conference, June 2006
  10. Why Australia has so much uranium
  11. About Email Alert

1. New Minerals Chief

Dr James Johnson has been appointed as Geoscience Australia's new Chief of Minerals Division and took up his position on 23 January. James has wide experience in mineral exploration, mine geology and research management. James has joined Geoscience Australia from Gold Fields Australasia where he managed exploration programs within Australasia.

James may be contacted via email or phone +61 (0)2 6249 9236.

2. Simpler access to Minerals data, products, and conference information

We have published a new web page providing theme-based access to available minerals databases, web applications, and data. Find a complete listing of all the databases and information relevant to the minerals industry at the Geoscience information for exploration page.

In addition, Geoscience Australia has added a new conferences & seminars page to its web site. For information regarding events around Australia that GA is hosting or co-hosting, please see the conferences and seminars web page.

3. Iron oxide Cu-Au ore-forming systems of the Gawler Craton workshop, February 2006

A workshop on Iron oxide Cu-Au ore-forming systems of the Gawler Craton will be held at the AMF Centre in Adelaide on 24 February 2006. Highlights of the workshop include:

  • Updates of IOCG deposit geology including recent discoveries;
  • New results on regional and district geological settings;
  • Exploration characteristics;
  • New GA-PIRSA products; and
  • Core display.

For further information and registration visit the Geoscience Australia Conferences and Seminars web page, or email Roger Skirrow; or phone +61 (0)2 6249 9442.

4. pmd*CRC Central Gawler Gold Province numerical modelling workshop, February 2006

A workshop on pmd*CRC Central Gawler Gold Province numerical modelling will be held in the Primary Industries and Resources SA Office, 101 Grenfell Street, Adelaide, SA (PIRSA) on 23 February 2006. Highlights of the workshop include:

  • Tarcoola fluid flow - mechanical modelling final results;
  • Tunkillia fluid flow - mechanical modelling preliminary results;
  • Chemical modelling of gold mineralising processes; and
  • Planning and data gathering for final modelling.

For further information and registration visit the PIRSA Upcoming Events web page, or email Roger Skirrow; or phone +61 (0)2 6249 9442.

5. Update on geophysical survey data acquisition

The following surveys are currently in progress:

Western Australia

  • Paterson Central airborne magnetic and radiometric survey - 49% complete;
  • Gascoyne airborne magnetic and radiometric survey - 54% complete;
  • East Yilgarn airborne magnetic and radiometric survey - completed on 12 December.

South Australia

  • Ooldea - Nullarbor airborne magnetic and radiometric survey - completed on 11 December.

Queensland

  • Bowen - Surat gravity survey - 68% complete;
  • Bowen - Surat South airborne magnetic and radiometric survey - commenced on Monday 23 January. Fugro will collect a nominal 154,000 line kilometres of new data over approximately 53,800 km2;
  • Bowen - Surat North airborne magnetic and radiometric survey - commenced on Monday 23 January. UTS will collect a nominal 170,000 line kilometres of new data over approximately 60,550 km2.

The surveys in Queensland form part of the Queensland Government's four year $20 million Smart Exploration initiative to stimulate mineral exploration investment in Queensland.

The new data from the Bowen - Surat region will be acquired on east-west flight lines spaced 400 metres apart with a ground clearance of 80 metres. Geoscience Australia will be managing the flying program.

For further information, please email Murray Richardson; or phone +61 (0)2 6249 9229.

6. Update on recently released datasets - Two new products have been released from the Magnetic Database of Australia

Two new datasets have been produced from the total magnetic intensity grid of Australia. They are:

  • Vertical derivative of total magnetic intensity grid of Australia. This grid (4 byte real) has a cell size of 0.025 seconds of arc (~250 m) and emphasizes the shorter wavelength information unseen in the original grid. The first vertical derivative of the total magnetic intensity grid of Australia shows small variations in the magnetic field. This product will facilitate the interpretation of the magnetic grid of Australia. This enhancement amplifies the shorter wavelength (shallow source) features at the expense of features with longer wavelength (deeper source);
  • Greyscale image of vertical derivative of total magnetic intensity grid of Australia. This grid (byte data) was generated from the vertical derivative grid by applying a histogram equalisation "stretch" to the data. The coastline of Australia has been "burnt" into the image data. In order to fully appreciate the resolution of the data displayed by this image, it should be viewed or printed at scales of 1:5 000 000 or larger. Printing is easily accomplished by importing the data into a suitable software package such as MapInfo, ArcMap or ErMapper.

Both datasets are available from the Geophysical Archive Data Delivery System "GADDS".

For further information, please email Murray Richardson; or phone +61 (0)2 6249 9229.

7. Mount Isa Airborne geophysical datasets

Previously un-released magnetic and radiometric point-located and gridded datasets from the Mount Isa region are now available from the Geophysical Archive Data Delivery System "GADDS".

The survey data was collected during the 1990s and became available for public release in 2005. The datasets, from thirty separate survey areas in the Mount Isa region, were levelled and merged to produce a contiguous dataset. The final datasets cover the following standard 1:250 000 map sheets: Westmoreland (part), Lawn Hill, Donors Hill (western 2/3), Camooweal, Dobbyn, Millungera (part), Mount Isa, Cloncurry, Julia Creek (part), Urandangi, Duchess, McKinlay (part), Glenormiston (part) and Boulia (part).

The data were acquired on flight lines spaced between 200-500 metres apart with a ground clearance 80 metres.

For further information, please email Murray Richardson; or phone +61 (0)2 6249 9229.

8. Significance of Devonian-Carboniferous igneous activity in Tasmania as derived from U-Pb SHRIMP dating of zircon

An article in the December 2005 issue of Australian Journal of Earth Sciences presents 25 new SHRIMP U-Pb zircon emplacement ages for Palaeozoic granites in Tasmania. All but two of the ages are Devonian - Carboniferous, as had been expected. However, two intrusions that had previously yielded such ages by other dating techniques are now shown to be considerably older (Late Cambrian). Even without those exceptions, approximately 50 million years of felsic igneous activity has been documented. Several different tectonic scenarios are evaluated to explain the space-time distribution of the granites. The association of some of the granites with significant orebodies allows temporal constraints to be placed on the timing of mineralisation, which was not all of the same age, even for a single commodity (such as Sn).

For further information, please email Lance Black; or phone +61 (0)2 6249 9314.

9. Evolution and metallogenesis of the North Australian Craton conference, June 2006

This conference, to be held at the Crowne Plaza, Alice Springs on 20-22 June 2006, will present research results from the North Australia and Tanami Projects, joint National Geoscience Accord projects between Geoscience Australia, the Northern Territory Geological Survey and the Geological Survey of Western Australia. Results to be presented include the geology and metallogenesis of the Arunta, Tennant and Tanami regions, the results of the Tanami seismic survey acquired in May-July 2005 and a synthesis of continental-scale drivers for Palaeo- to Mesoproterozoic mineral systems in Australia, including those in the Pine Creek and Mt Isa Inliers.

A provisional program is available from the GA Conferences and Seminars web page. The registration fee of $350 includes lunches and teas each day along with the conference dinner.

For further information, please email Dave Huston; or phone +61 (0) 2 6249 9577.

10. Why Australia has so much uranium

Australia's vast resources of uranium amount to a staggering 40 per cent of the world's total identified resources of uranium recoverable at low cost. This article examines the distribution of Australia's in-ground resources by type of deposits, reviews past, present and future exploration and explains why Australia is so rich in uranium resources.

For further information visit the AusGeo News webpage.

11. About Email 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