Mineral Alert April 2007

  1. Isa-Georgetown-Charters Towers Seismic Survey - Progress
  2. New Gravity Survey Data added to the Australian National Gravity Database
  3. New model for Tanami gold mineralisation
  4. Update on geophysical survey data acquisition
  5. About Email Alert

1. Isa-Georgetown-Charters Towers Seismic Survey - Progress

The seismic reflection component of the Isa-Georgetown-Charters Towers seismic and add-on survey is scheduled to commence in early May. The survey is one part of the Division's larger Onshore Energy Security Program.

The Isa-Georgetown-Charters Towers seismic survey consists of three seismic traverses. Traverse 07GA-IG1 runs north-eastwards from just north of Cloncurry to that part of the Gilbert River between Croydon and Georgetown. Traverse 07GA-IG2 runs from just east of Croydon, through Georgetown, and on to Mt Surprise. Traverse 07GA-GC1 runs from west of Mt Surprise, through Greenvale, around the west side of Charters Towers, and on to the Cape River. View a map of the traverses. (JPG, 118KB)

This project is investigating potential energy related options along the eastern margin of the Mt Isa Block. This includes within the Carpentaria-Eromanga Basins, with its possible deeper sediments, hot granites and geothermal options in the Croydon-Georgetown area, energy options north of Charters Towers, and the northern margin and northern part of the Drummond Basin. In addition, new Gravity and MT data are planned to be collected, as well as integrating existing crustal seismic data to better understand both the shallow and deeper parts of the crust.

For more information please email Bruce Goleby at Geoscience Australia, or phone on +61 (0)2 6249 9404.

2. New Gravity Survey Data added to the Australian National Gravity Database

New gravity data from surveys in New South Wales and South Australia were incorporated into the Australian National Gravity Database in March 2007.

Data from the 2006 gravity survey on the Braidwood 1:100 000 sheet area were provided to Geoscience Australia by the NSW Department of Primary Industries for inclusion into the Australian National Gravity Database. These data were acquired at a station spacing of 2.0 km x 2.0 km with a small area at 1.0 km x 1.0 km spacing.

Similarly the Department of Primary Industries and Resources, South Australia provided Geoscience Australia with its 2006 Southern Stuart Shelf gravity data for inclusion into the Australian National Gravity Database. These data were acquired at a station spacing of 2.0 km x 2.0 km.

All data in the Australian National Gravity Database, can be obtained free-of-charge using the Geophysical Archive Data Delivery System (GADDS).

For further information, please email Mario Bacchin, or phone +61 (0)2 6249 9308.

3. New model for Tanami gold mineralisation

A key component of a six year collaborative study into this major Proterozoic gold province and its surrounds was the acquisition of 724 line-kilometres of deep seismic reflection data. Two fundamental results are the identification of a major suture between the Tanami and Aileron provinces, and the correlation of the position of known mineral fields with the surface projection of crustal-penetrating shear zones and/or antiformal thrust stacks.

Further information on the project can be obtained from a media release on the project, an article in AusGeo News and from the Tanami 3D model.

4. Update on geophysical survey data acquisition

The status of current surveys is:

Location State Survey % Complete Gravity Stations Flight Lines Spacing Ground Clearance Comments
Ashburton WA Airborne magnetic & radiometric 100% N/A north-south 400 m 60 m Completed 27 December 2006. Data were released on 4 April 2007 via GADDS.
Southern Officer Basin WA Airborne magnetic & radiometric 100% N/A north-south 400 m 60 m Completed 18 January 2007. Data were released on 28 March 2007 via GADDS .
Murchison WA Gravity 100% 3600 new east-west over an area of 22 000 km2 2.5 km N/A Completed 17 March 2007. Preliminary data from the survey has been supplied to GA for assessment.
South Kimberly WA Airborne magnetic & radiometric N/A N/A north-south over an area of 57 920 km 400 m 60 m Requests for quotation closed 27 March 2007. The survey will cover parts of the Lennard River, Lansdowne, Noonkanbah, Mount Ramsay, Mount Bannerman 1:250 000 Map Sheets.
Isa South-West Qld Airborne magnetic & radiometric 100% N/A east-west 400 m 80 m Data from this survey were released via GADDS on 13 February 2007.
Isa South-East Qld Airborne magnetic & radiometric 100% N/A east-west 400 m 80 m Data from this survey were released via GADDS on 4 April 2007.
East Isa North Qld Magnetic & Radiometric N/A N/A east-west over an area of 113 000 km 400 m 80 m Data acquisition is expected to commence in early April. Survey covers parts of Richmond, Hughenden, McKinlay, Manuka and Tangorin 1:250 000
East Isa South Qld Magnetic & Radiometric 20% N/A east-west
400 m
80 m
The survey covers parts of the McKinlay, Manuka, Mackunda, Winton, Brighton Downs and Maneroo 1:250 000 map sheets, with data acquisition expected to commence at the end of flying on the Isa South-East airborne survey. When complete, the survey will have collected approx 145 900 line kilometres of new data.
Mount Isa C1 - Duchess and Urandangi Qld Gravity 100% ~9 236 with C2 (below) N/A 2.0 km grid N/A Data from this survey has been supplied to GA for assessment.
Isa Area D Qld Gravity 75 460 4 903 N/A 4.0 km grid N/A Data acquisition will commence on completion of Isa Area E. The survey covers the entire Bedourie, Machattie, Birdsville and Betoota 1:250 000 Map Sheets and parts of the Connemara 1:250 000 Map Sheet.
Isa Area E Qld Gravity 71% 6 233 N/A 4.0 km grid N/A Data acquisition commenced on 1 February 2007. The survey will cover the entire McKinlay, Mackunda, Brighton Downs, Richmond and Manuka 1:250 000 Map Sheets and parts of the Winton and Maneroo 1:250 000 Map Sheet
Croydon Qld Airborne & Radiometric N/A N/A east-west 400 m 80 m Data acquisition expected to commence in May 2007. The survey covers parts of the Burketown, Normanton, Donors Hill, Croydon and Millungera 1:250 000 Map Sheets. When complete, the survey will have collected approx 100 000 line kilometres of new data.
Tanumbirini N/A Airborne magnetic & radiometric N/A (145 251 line km) N/A east-west 400 m 80 m Data acquisition is expected to commence in June 2007. The survey covers parts of the Tanumbirini and Hodgson Downs 1: 000 Map Sheets.
North-East Tasmania Tas Airborne magnetic & radiometric 13% N/A east-west 200 m 90 m Data acquisition commenced on 18 March 2007 by fixed-wing aircraft. The survey covers Tasmanian land mass over part of the following standard 1:100 000 map sheets - Ninth Island, Cape Portland, Swan Island, St Patricks, Forester, Georges Bay, St Pauls and Break O'Day.
Flinders Island Tas Airborne magnetic & radiometric 100% N/A east-west 200 m 90 m Data acquisition was completed on 28 March 2007. The survey covers the Flinders, Cape Barren and Clarke Islands land masses.
Australia-wide N/A Airborne Geophysical tie-line N/A (145 000 line km) N/A north-south 75 km 80 m Data acquisition commenced 29 March 2007.
Canning Basin 2007 N/A Airborne magnetic & radiometric N/A 70 192 km north-south 800 m 80 m Data acquisition is expected to commence on 20 April 2007. The survey covers parts of the Anketell, Joanna Spring, Dummer, Paterson Range, Sahara, Tabletop and Ural 1:250 000 Map Sheets.

Geoscience Australia will be managing the data acquisition program in Queensland, Northern Territory and Tasmania.

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

5. 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