Minerals Alert December 2008

  1. South Australian Airborne electromagnetic survey - Call for expressions of interest and subscribers
  2. Online resources for nickel and platinum explorers
  3. Release of new index of airborne geophysical surveys
  4. Release of the 1:1 million scale Geology of Western Australia digital dataset
  5. National Geochemical Survey of Australia update
  6. Digging Deeper 6
  7. Update on geophysical data releases
  8. Useful Geoscience Australia websites
  9. About Minerals Alert

1. South Australian Airborne electromagnetic survey - Call for expressions of interest and subscribers

Geoscience Australia is planning a program of regional airborne electromagnetic mapping over the Frome Embayment and North West Murray Basin regions of South Australia. Funded by the Australian Government's Onshore Energy Security Program, the survey will consist of 5 km spaced lines over parts of the Maree, Callabonna, Copley, Frome, Parachilna, Curnamona, Olary and Chowilla 1:250,000 sheets, as shown in the diagram.

Companies are invited to register their interest in the project by submitting proposals to infill areas within the regional survey lines or to extend the current survey area.

By subscribing to a large regional survey, companies will benefit through Geoscience Australia covering mobilisation and stand-by costs as well as an expected reduction in the per line kilometre charge. Subscribers will benefit also from Geoscience Australia's quality assurance and quality control procedures to ensure that the data released are fit-for-purpose. Due to the size of the survey over approximately 80,000 km2, it may take six to twelve months from the completion of data acquisition before data will be available to subscribers. Data acquired under company subscription will be subject to a 12 month confidentiality period from receipt of final data.

Murray Basin Airborne Electromagnetic Survey Image

Murray Basin Airborne Electromagnetic
Survey Image
© Geoscience Australia

Successful proposals must adhere to the following criteria:

  • the proposed boundary for the infill area is to be a simple polygonal shape
  • the number of line kilometres for each infill area is to be no less than 200 in total
  • before Geoscience Australia approaches the panel of AEM contractors, a signed agreement with each subscriber is required
  • all infill data will be released at the same time. There will be no early supply of any data to subscribers.

Geoscience Australia will select areas that complement the objectives of the survey from the company proposals received for infill/extension flying. Expressions of interest should be submitted by Friday 6 February 2009 and should include a regular shaped polygon of the desired infill/extension area with the corner coordinates listed in tabular form.

Geoscience Australia is seeking assistance also with borehole geophysical induction conductivity logging from tenement holders in the survey area.

For more information, email alan.whitaker@ga.gov.au or phone +61 2 6249 9702; or murray.richardson@ga.gov.au or phone +61 2 6249 9229.

2. Online resources for nickel and platinum explorers

Geoscience Australia has released online, a resource package to accompany the new web-based 1:5 000 000 Map of Australian Proterozoic Mafic-Ultramafic Magmatic Events. The package includes a 140-page user guide for the map, data tables and a time-series animation of the 30 mafic-ultramafic magmatic events from 2500-500 Ma. The package is presented in a ZIP file, and contains the following resources:

  • Australian Proterozoic Mafic-Ultramafic Magmatic Events 1:5 000 000 Map Sheets 1 and 2 (PDF and JPG)
  • Geoscience Australia Record 2008/15: Guide to Using the 1:5 000 000 Map of Australian Proterozoic Mafic-Ultramafic Magmatic Events by DM Hoatson, JC Claoue-Long & S Jaireth (PDF, 140 pages)
  • Geoscience Australia Record 2008/15: Appendix 10 (14 PDF tables)
  • Time Series Animation (PDF of 35-image slideshow)
  • Interim Map Part 1: Western Australia only (PDF and JPG)
  • Interim Map Part 2: Northern Territory and South Australia only (PDF and JPG).

The 1:5 000 000 Map shows the geographic extent and age relationships of Proterozoic mafic and ultramafic rocks and associated mineral deposits throughout Australia. The resource package adds functionality to the large-format map by explaining how the continent-scale correlations of mafic-ultramafic magmatism can be used as a guide to mineral prospectivity. The time-series animation shows how the location of 30 magmatic events responded to the evolving crustal structure of Australia during the Proterozoic.

The resource package will be of interest to those explorers searching for nickel, platinum-group elements, chromium, titanium and vanadium. It will be a fundamental resource also for understanding the dynamic evolution of the Australian continent.

The ZIP file can be found on Geoscience Australia Maps of Australia webpage.

For further information, email jon.long@ga.gov.au; or phone +61 2 6249 9418.

3. Release of new index of airborne geophysical surveys

The Index of Airborne Geophysical Surveys (10th edition) compiled by P.J. Percival, Geoscience Australia Record 2008/01, is being released by Geoscience Australia on 10 December 2008. The new edition, which will be available for free download from Geoscience Australia's website, is the latest compilation of metadata of Australian open file government airborne surveys and supersedes the previous 9th edition (August 2007).

The Index includes specifications of more than 1000 airborne surveys conducted between 1951 and October 2008 which comprise more than 28 million line kilometres of mainly total magnetic intensity, gamma-ray spectrometric and land elevation data. Specifications for each survey are presented in tabular format, with four surveys per page arranged in numerical order based on assigned Geoscience Australia airborne survey project numbers.

Clients can quickly identify airborne surveys of interest and obtain the relevant metadata by using two lookup tables:

  • a table listing survey names in alphabetical order, with corresponding Geoscience Australia project numbers
  • a table listing 1:250,000 map sheet names in alphabetical order, along with Geoscience Australia project numbers of surveys located on each map sheet.

Also included in the Index are two data coverage maps - the November 2008 editions of the aeromagnetic and gamma-ray survey index maps, which indicate the standard of data coverage (based on survey line spacing) over Australia in relation to 1:250,000 map sheets. Areas covered by new surveys acquired by the States during 2008/09 also are shown on these maps.

A full copy of the document in PDF format will be available from Geoscience Australia Minerals publications web page.

For further information, email peter.percival@ga.gov.au; or phone +61 2 6249 9578.

4. Release of the 1:1 million scale Geology of Western Australia digital dataset

Compiled in collaboration with the Geological Survey of Western Australia, the final piece of the national 1:1 million scale digital outcrop geology coverage is being released by Geoscience Australia on 16 December 2008. The national geology dataset will be launched in Canberra with co-ordinated events in the geological surveys of all States and the Northern Territory. The national geology coverage has been compiled mainly by synthesising published 1:250 000 scale mapping, updated with more recent mapping where the 1:250 000 maps are outdated. The data is a seamless coverage, removing all border and map tile joins, and providing a single standard description of bedrock and regolith across the nation. The Western Australian data, as well as data for all other States and Territories, will be available to download free from the Geoscience Australia Free Data Downloads website from 16 December 2008.

For further information, email oliver.raymond@ga.gov.au; or phone +61 2 6249 9992.

5. 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 around 1400 large catchments covering 91% of the continent. The project, which is a collaborative venture with the geological surveys of all States and the Northern Territory under the National Geoscience Agreement, started in January 2007. Recent progress includes:

  • sample collection nationally has passed the 75% mark
  • sampling is completed in Tasmania, Victoria, New South Wales and Queensland
  • 25% of the total samples have been submitted for analysis
  • overview/presentations about the project were presented at the 33rd International Geological Congress held in Oslo in August 2008 and at the PACRIM Congress 2008 held on the Queensland Gold Coast in November 2008.About Minerals Alert

View background information on the National Geochemical Survey of Australia project and an updated map of sampling progress as at 30 September 2008.

For further information, email patrice.decaritat@ga.gov.au; or phone +61 2 6249 9372.

6. Digging Deeper 6

The sixth "Digging Deeper" seminar of the Geological Survey of Queensland will be held on 10 December 2008 at the Bardon Conference Centre in Brisbane. Geoscience Australia officers will be contributing to the seminar through involvement in talks on the interpretation of deep seismic surveys in the Mt Isa and Cloncurry-Croydon regions, 3-D visualisation of the Mt Isa seismic survey and the Queensland regolith project.

For further information, email russell.korsch@ga.gov.au; or phone +61 2 6249 9495; or visit the Geological Survey of Queensland website.

7. Update on geophysical data releases

Data were released for the South Kimberley, Dumbleyung airborne magnetic and radiometric surveys and Windimurra, Westmoreland-Normanton and Central Arunta gravity surveys in November 2008.

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

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

8. Useful Geoscience Australia websites

Geoscience Australia's website provides easy access to a comprehensive range of free maps and publications of interest to mineral explorers.

9. 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