Minerals Alert March 2005

  1. Australian Mineral Exploration Review for 2004
  2. Granite-related mineralisation in Tasmania
  3. OZCHRON Web Reports
  4. Release of Tanami mineral system research results
  5. Annual Geoscience Exploration Symposium (AGES) Conference
  6. About Mineral Alert

1. Australian Mineral Exploration Review for 2004

Geoscience Australia has released a review of mineral exploration in Australia for the year 2004. The review examines levels and trends in exploration in a national and global context. It also presents highlights of government programs that have released information to support exploration during the year. Overall expenditure in 2003-04 rose by 7.4% to $786.7 million and increase of 7.4%. Of the total 39% was spent on the search for previously unknown mineralisation. Highlights of the year include discoveries of nickel mineralisation in the Yilgarn Craton and elsewhere in Western Australia and of minerals sands in the South Australian portion of the Eucla Basin. Gold mineralisation was reported from a number of provinces across Australia. Ongoing exploration at known deposits yielded important results including the release of an initial resource estimate at Prominent Hill copper-gold deposit and a major increase in resources at the Olympic Dam deposit, both in South Australia.

Copies of the review may be downloaded from the Geoscience Australia web site.

For more information contact Mike Huleatt at Geoscience Australia by phone on +61 (0)2 62499087 or by email at mike.huleatt@ga.gov.au

2. Granite-related mineralisation in Tasmania

To coincide with the joint release by Mineral Resources Tasmania (MRT) and Geoscience Australia (GA), of new digital geological and metallogenic datasets on Tasmanian granites, MRT and GA are holding a day of seminars and an accompanying 4-day excursion, focussing on granite-related mineralisation, in Tasmania on May 22-26.

The seminar on 'Tasmanian Palaeozoic granites, mineralisation and potential', will be held on Thursday 26 May 2005, at Mineral Resources Tasmania, 30 Gordons Hill Road, Rosny Park, Hobart, from 8:45am to 5:00pm. Speakers include Tony Brown, Geoff Green, Marcus McClenaghan, John Everard (MRT); Lesley Wyborn, Dave Champion (GA); Dave Leaman (Leaman Geophysics); Phil Blevin (Petrochem Consultants); Ross Large, Garry Davidson, Anthony Harris (CODES), Rob Reid (TasGold Ltd), and Ken Morrison (Morrison K C Pty Ltd). Seminar costs are $15 per head, which includes a light lunch.

Contacts for the seminar are: Dr Marcus McClenaghan, email: mmcmclenaghan@mrt.tas.gov.au and Dr Jafar Taheri, email: jtaheri@mrt.tas.gov.au

The excursion, to be led by Jafar Taheri and Ralph Bottrill (both MRT), will visit the Aberfoyle-Storeys Creek (Sn-W) veins, the Anchor tin deposit, the Golconda area, and Lefroy (gold exploration) in NE Tasmania, and the Kara (magnetite-scheelite skarn), the Moina area (magnetite-fluorite skarn) and satellite base metal-gold skarns and vein deposits, and Mount Bischoff (porphyry-hosted and skarn tin) in NW Tasmania. Outcrops of a wide variety of granites will be examined and there is spectacular scenery throughout the excursion. The excursion departs from Hobart at 9:00am on the Sunday (22nd May) and returns at approximately 5:30 pm on the Wednesday (25th May). Costs are still to be finalised but will be around $750; these include transport, accommodation, all meals and a guidebook.

Contacts for the excursion are: Ralph Bottrill, email rbottrill@mrt.tas.gov.au and Dr Jafar Taheri, email jtaheri@mrt.tas.gov.au

3. OZCHRON Web Reports

Twenty seven recently dated samples from the Gawler Craton, including 11 from the Central Gawler Gold Province and 16 from the Mt Woods Inlier, are available through the GA Geochronology Group website. The samples include crystallisation ages of granites, maximum ages of sediments and metamorphic crystallisation ages. The Web Reports include the analytical data, description of the zircons from the samples, and a basic interpretation of their origin and significance. An outcome of the research detailed in the Reports is the suggestion of two distinct magmatic episodes within the Hiltaba Suite, at ~1590 Ma and ~1580 Ma in both regions, as well as the recognition of high grade metamorphism associated with the Hiltaba age thermal event in the Mt Woods Inlier. These findings have important implications for understanding the timing of magmatism and its relationship to gold mineralisation in both the Mt Woods Inlier and the Central Gawler Gold Province. Further to this, the results emphasise the importance of high precision geochronology. With the approved purchase of an ion microprobe, the Minerals Division is in a position to maintain this capability.

For more details, visit the OZCHRON reports page, or contact Oliver Holm on Phone: (02)6249 9349, or email oliver.holm@ga.gov.au, or Roger Skirrow on Phone: (02)6249 9442, or email roger.skirrow@ga.gov.au

4. Release of Tanami mineral system research results

Northern Territory Geological Survey Report 18, entitled "Gold mineral system of the Tanami Region", which reports the results of four years of joint NTGS-GA research in the Tanami Region has been released. This report can be ordered on the NTGS web site

5. Annual Geoscience Exploration Symposium (AGES) Conference

At the AGES Conference in Alice Springs, 22-23 March, GA scientists will be presenting five talks on "Regolith-landscape framework of NT" (M Craig), "New geochronology from the Davenport Province and eastern Arunta: implications for stratigraphic correlations and mineral systems" (J Claoue-Long) "Common threads in the Pine Creek, Tanami and Tennant Creek Au-mineral systems: sewing up new exploration strategies" (L Wyborn), "New constraints on the timing of deposition and mineralisation in the Tanami" (A Cross), and "Inversion modeling in the Tanami" (A Meixner).

These presentations are part of a program of 25 presentations by NTGS, GA, industry and University geoscientists covering all aspects of Northern Territory geology. A full program and registration details can be found on the NTGS web site

6. 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