Minerals Alert April 2006

  1. New map of iron oxide-Cu-Au potential in the Gawler Craton, South Australia
  2. 1:1 million surface geology of eastern Australia
  3. Update on geophysical survey data acquisition
  4. Update on recently released products
  5. New geochronology reports in OZCHRON
  6. About Email Alert

1. New map of iron oxide-Cu-Au potential in the Gawler Craton, South Australia

Geoscience Australia has released an updated version of a map of iron oxide Cu-Au (IOCG) potential of the Gawler Craton, South Australia. This map was presented in preliminary form at a workshop held in Adelaide on 24 February 2006. The map shows the spatial distribution of key 'essential ingredients' of IOCG ore-forming systems, including:

  • rock units of the Gawler Ranges-Hiltaba Volcano-Plutonic Association, subdivided by supersuite;
  • faults/shear zones subdivided by interpreted age of youngest significant movement;
  • copper geochemistry from drill holes intersecting crystalline basement;
  • hydrothermal alteration assemblages and zones, based on drill hole logging, potential-field interpretation, and inversion modelling of potential-field data; and
  • host sequence units considered important in localising alteration and mineralisation. IOCG potential of the Gawler Craton is shown as domains with ranks from 1 (highest) to 4.

A medium-resolution image of the map is available from the Gawler Mineral Promotion Maps and Online GIS page. A CD with high-resolution print files and PDFs, or a printed copy of the map, are available for the cost of transfer, or you can email the Sales Centre directly. The map is designed to be printed at 1:500 000 scale, but may be printed at other scales if desired. A scale of 1:750 000 fits the width of A0 paper, whereas at 1:500 000 scale the map prints at ~106 cm width.

For further information, please email Patrick Lyons; or phone +61 (0)2 6249 9763.

2. 1:1 million surface geology of eastern Australia

Geoscience Australia released a single, seamless, 1:1 million scale, digital data set of the surface geology of eastern Australia in March 2006. The data set was compiled from the individual state-wide data sets released in September 2005, but includes minor updates since their release. Over 3500 geological units are depicted with a consistent representation of the regolith/Cainozoic throughout the region. The data set is approximately 650 MB and can only be obtained on CD from the Sales Centre.

Capture of the spatial part of the surface geology of the NT and SA is well advanced, with release expected in November-December 2006 after compilation of appropriate attributes and review by the respective Territory and State Surveys.

For further information, please email Alan Whitaker; or phone +61 (0)2 6249 9702.

3. Update on geophysical survey data acquisition

Western Australia

  • Paterson Central airborne magnetic and radiometric survey - 49% complete. Rain from Cyclone Glenda has delayed the re-commencement of this survey. Flying is expected to re-commence in the second week of April;
  • Gascoyne airborne magnetic and radiometric survey was completed on Sunday 26 March.

Requests for quotation closed on Wednesday 29 March for provision of magnetic and radiometric coverage in three regions of Western Australia:

  • 34,920 km2 in the Ashburton region;
  • 37,330 km2 in the Southern Officer Basin region;
  • 27,920 km2 in the Musgrave region.

When completed, the projects will release a total of more than 284 000 line kilometres of magnetic and radiometric data to the public domain.

In the Ashburton and Officer Basin surveys the new data will be acquired on east-west flight lines spaced 400 metres apart with a ground clearance of 80 metres.

In the Musgrave region two separate survey areas will be flown.

  • In the Musgrave North area, north-south flight lines spaced 400 metres apart, with a ground clearance of 80 metres, will cover an area of approximately 16,220 km2;
  • In the Musgrave South area, east-west flight lines spaced 400 metres apart, with a ground clearance of 80 metres, will cover an area of approximately 11,700 km2.

Geoscience Australia will manage the flying program in all three regions of Western Australia.

Queensland

  • Bowen-Surat gravity survey - 77% complete;
  • Bowen-Surat South airborne magnetic and radiometric survey - 93% complete;
  • Bowen-Surat North magnetic and radiometric survey - 26% complete;
  • West Mount Isa magnetic and radiometric survey was completed on Sunday 2 April.

Requests for quotations to provide gravity coverage in the Mount Isa area closed on Wednesday 29 March. This incorporated a nominal 9 898 new gravity stations over an area of approximately 78 000 km2 in the Mount Isa region of western Queensland. The survey, which covers the Lawn Hill, Donors Hill, Camooweal, Dobbyn and Mount Isa (western half) standard 1:250 000 Map Sheet areas, is proposed to commence in July 2006.

Fugro Airborne Surveys has been awarded a contract to collect a nominal 140 500 line kilometres of new airborne magnetic and radiometric data over an area of the south-west Mt Isa Inlier. The survey covers approximately 50 190 km2 over the Mt Whelan, Bedourie, Birdsville, Machattie (western third), Betoota (Bilpamorea 1:100 000 sheet) standard 1:250 000 Map Sheet areas. The survey commenced on Monday 3 April.

Requests for quotations to provide magnetic and radiometric coverage in the south-eastern Mount Isa region of western Queensland closed on Wednesday 29 March. This covers 35,880 km2 over the Machattie (eastern two-thirds), Betoota (Wantata and Mooraberree 1:100 000 sheets), Connemara and Brighton Downs standard 1:250 000 Map Sheet areas.

When completed, the Isa south-east airborne magnetic and radiometric survey project will release a total of approximately 101,200 line kilometres of magnetic and radiometric data to the public domain.

For both surveys, Isa south-west and Isa south-east, the new data 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 data acquisition program in the Mount Isa region of western Queensland.

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

 

4. Update on recently released products

The following maps are now available to download free of charge:

  1. The 4th Edition of the Magnetic Anomaly Map of Australia at 1:5 million and 1:25 million scales, under Geophysical Maps of Australia
  2. Updated Gravity station coverage and location maps, under Index Maps of Australia

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

5. New Geochronology Reports in Ozchron

The Geochronology group have been busy uploading their work in the last few months, adding a total of 109 new geochronology data reports to the National Geochronology Database, OZCHRON.

The new data covers areas across the country, ranging from the Amadeus Basin and Arunta Block, through Broken Hill to New England and many places in between.

OZCHRON and geochronological data are a key component of ongoing information management developments at Geoscience Australia, and we are always keen to receive feedback from users. If you have any comments or suggestions about what is available, and the delivery format, please email Keith Sircombe; or phone +61 (0)2 6249 9543.

6. 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