Minerals Alert July 2005

  1. Release dates for South Yilgarn geophysical survey data
  2. New Mt Isa Geochronology Results
  3. The Tanami Seismic Collaborative Research Project
  4. Mt Isa Sequence Stratigraphy
  5. Paterson Project
  6. Workshops on Interoperability and the Australian Mining Industry
  7. About Minerals Alert

1. Release dates for South Yilgarn geophysical survey data

Data from the South Yilgarn survey Block C (Newdegate-Ravensthorpe - Bremer Bay) and from Block E (Nyabing) will be released on 18 July 2005.

Update on survey data acquisition:

  • The Paterson North airborne geophysical survey was completed by Fugro Airborne Surveys on 1 June.
  • The Paterson Central airborne geophysical survey by UTS Geophysics commenced on 25 June.
  • The Birrindudu gravity survey was completed by Fugro Ground Geophysics on 17 June.
  • The Maryborough airborne geophysical survey, undertaken by UTS Geophysics, was 54% complete as of 19 June.

Update on contracts for data acquisition:
Planning is underway for the next regional surveys of the West Australian government's four-year, $12 million program to increase airborne magnetic and radiometric coverage of Western Australia. The surveys are proposed to commence in July 2005.

Requests for quotation have been released for provision of magnetic and radiometric coverage in two areas: 58 000 km2 in the East Yilgarn region; and 36 000 km2 in the Gascoyne region. When completed, the projects will release a total of more than 267 000 line kilometres of magnetic and radiometric data to the public domain.

The new data will be acquired on east-west flight lines spaced 400 metres apart with a ground clearance of 60 metres above ground level. Geoscience Australia will be managing the flying program.

For further information, please contact Murray Richardson on + 61 (0)2 6249 9229 or email murray.richardson@ga.gov.au.

2. New Mt Isa Geochronology Results

A new chronostratigraphic event chart for the Leichhardt and Calvert Superbasins of the Western Succession at Mt Isa spanning the interval ~1800 Ma to 1650 Ma has been developed from new U-Pb SHRIMP dates. To view the chart, please see the latest AusGeo News. The new chart recognises three supersequences in the Leichhardt Superbasin:

  • The Guide Supersequence, ~1800-1785 Ma, includes the Bottletree Formation and Lower and Upper Mount Guide quartzites;
  • The overlying Myally Supersequence, ~1780-1765 Ma, includes the Eastern Creek Volcanics, Lena, Alsace and Whitworth quartzites, and Bortala and Lochness formations; and
  • The Quilalar Supersequence, ~1755-1740 Ma, includes the Quilalar and Corella formations and the Ballara Quartzite.

New SHRIMP data has also refined ages for the Burstall, Fiery and Sybella magmatic events. The ~1740-1735 Ma Burstall Event represents a bimodal, dominantly intrusive event following sedimentation of the Quilalar Supersequence. The refined age for the Weberra Granite is within error of the age for the Fiery Creek Volcanics, and indicates that they are both part of the ~1710 Ma Fiery Event. Three new SHRIMP ages for the Sybella Granite are all within error of each other and are coeval with the Carters Bore Rhyolite, indicating that magmatism associated with these intrusives is constrained to 1675-1670 Ma.

For further information, please contact Peter Southgate on +61 (0)2 6249 9206, or email peter.southgate@ga.gov.au.

3. The Tanami Seismic Collaborative Research Project

The Tanami Survey Collaborative Research Project continues to collect seismic data. As of the 22 June, seismic data for the following traverse have been acquired:

  • Traverse T1 - 169 km completed (i.e. to intersection of T1 and T4),
  • Traverse T2 - Completed - 101.80 km,
  • Traverse T3 - Completed - 179.24 km, and
  • Traverse T4 - Work just commenced - 12.64 km.

Initial field monitor records indicate presence of a series of crustal scale structures as well as interesting upper crustal geometries. Processing will be completed by early 2006 with sections interpreted by GA, GSWA, NTGS, Newmont Exploration and Tanami Gold NL completed by mid 2006.

For further information on the seismic acquisition go to the Tanami Seismic web page. This web page is updated weekly during the acquisition phase. For further information, please contact Bruce Goleby on +61 (0)2 6249 9404, or email bruce.goleby@ga.gov.au.

4. Mt Isa Sequence Stratigraphy

Lithostratigraphic miscorrelations between the Surprise Creek Formation, Mt Isa and McNamara Groups of the western succession, Mt Isa are explained and resolved in the lead paper of Australian Journal of Earth Sciences Volume 52 No 1, pp 1-25.

Sequence analysis of stratigraphic units at or near the base of the McNamara and Mt Isa Groups demonstrates fundamental flaws in the existing lithostratigraphic correlations for the western succession. The AJES article "Overcoming Proterozoic quartzite sandbody miscorrelations: Integrated Sequence Stratigraphy and SHRIMP U-Pb Dating of the Surprise Creek Formation, Torpedo Creek and Warrina Park Quartzites, Mt Isa Inlier", by M. J. Jackson, P.N. Southgate, L. P. Black, P. R. Blake, and J. Domagala highlights the importance of sequence stratigraphy for the identification of unconformities and the accurate correlation of rock bodies that overlie and underlie these surfaces.

For further information, please contact Peter Southgate on +61 (0)2 6249 9206, or email peter.southgate@ga.gov.au.

5. Paterson Project

The Paterson Project is conducting research into the geological and metallogenic framework of the Paterson region, Western Australia. The region contains poorly exposed Neoproterozoic sedimentary successions in the northwest Paterson Orogen that host significant gold-copper (Telfer, Magnum), base metal (Nifty, Maroochydore) and uranium (Kintyre) deposits. The Paterson region is considered highly prospective for gold-copper and base metal mineral systems.

The Paterson Project fieldwork programme for the 2005 field season will address the stratigraphy, structure, geochemistry, geochronology and mineral systems of the region. The project team will be in the field from early July to mid-August and will focus on resolving difficulties in correlating the Throssell Range and Lamil Groups, as well as understanding their structure and mineral systems. This will be aided by new magnetic, radiometric and gravity geophysical datasets acquired by GSWA and new ASTER hyperspectral mineral assemblage images (GA) which will be ground-truthed this field season.

For further information, please contact Peter Southgate on +61 (0)2 6249 9206, or email peter.southgate@ga.gov.au.

6. Workshops on Interoperability and the Australian Mining Industry

Workshops will be held in the following capital cities to showcase the benefits of real time interoperability to the Australian mining industry.

  • Canberra: 1 July;
  • Darwin: 13 July;
  • Sydney: 19 July; and
  • Melbourne: 26 July

Funded by an AUSindustry Innovation Access Fora grant to a consortium comprising Geoscience Australia, CSIRO and Social Change Online, these workshops will be of particular interest to minerals exploration companies and its services sector which includes SME, (consulting firms, software developers and vendors), statutory bodies and geoscience agencies. Two types of workshops will be held:

  1. Executive Briefings by Lesley Wyborn of Geoscience Australia - on the benefits of real time interchange of data between Australian Government geoscience agencies and how Australian industries will benefit from interoperability.
  2. Technology Diffusion Workshops by Stuart Girvan (pmd*CRC and Geoscience Australia), Rob Atkinson (Social Change Online) and Andy Dent (CSIRO) to provide technical details of how interoperable technologies can be deployed in an organisation.

For details on SEEGrid Roadshow sessions in each state, and to register, visit the SEEGrid web site.

For further information contact Petra Bowling on Ph +61 (0)8 6436 8625, Fax +61 (0)8 6436 8555 or email petra.bowling@csiro.au.

7. 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