Minerals Alert December 2010

A monthly online newsletter with product news, data releases and projects relating to the minerals and energy exploration industry.

1. Report on uranium in hydrothermal fluids at 25° to 300°C, and implications for the formation of uranium deposits

The geochemistry of uranium in hydrothermal fluids at temperatures between 25° and 300°C has been studied to better understand the geochemical controls on the transport and deposition of uranium in hydrothermal systems. This understanding can assist in identifying mappable features of fertile uranium systems such as the association of uranium with oxidation-reduction fronts, alteration zones and other chemical gradients useful for regional and deposit-scale exploration targeting.

This report discusses transport and deposition of uranium under a range of conditions typical of many basin and surface related uranium systems such as sandstone-hosted, unconformity related, and calcrete hosted uranium deposits and is underpinned by an up-to-date compilation of thermodynamic data for geologically relevant uranium species (from 25° to 300°C).

The Solubility of uranium in hydrothermal fluids at 25°-300°C: Implications for the formation of uranium deposits report also presents the results of geochemical modelling of fluids in sedimentary basins recharged by oxidised meteoric waters, including a case study of the Westmoreland region of northern Australia. The results have implications for the spatial zoning of uranium versus copper mineralisation in basins and point to the need to re-assess the uranium potential of basins currently known only for copper, and vice versa.

For further information, email evgeniy.bastrakov@ga.gov.au; or phone +61 2 6249 9293.

2. Archean gold mineral systems in the Yilgarn Craton

The Yilgarn Craton in Western Australia is one of Australia’s key mineral provinces, producing more than half of the gold and most of the nickel mined in Australia. Geoscience Australia, in collaboration with the Predictive Mineral Discovery Cooperative Research Centre (pmd*CRC), conducted a series of projects in the eastern Yilgarn Craton between 2001 and 2008. Many of the new findings from this research challenge previous paradigms regarding the tectonics and geological architecture, as well as the relationship of gold to structure, magmatism and metamorphism.

For more information see the December 2010 issue of AusGeo News.

3. Update on the 34th International Geological Congress–Australia 2012

Australia, on behalf of the Oceania region, is hosting the 34th International Geological Congress (IGC) in Brisbane from 5 to 10 August 2012. The IGC will feature a wide ranging scientific program, with field trips, a large exhibition, training workshops and an education and outreach program. Among the products to be featured at the IGC will be a book produced by Geoscience Australia which will tell the story of Australia’s geological evolution through the lens of human impacts, illustrating both the challenges and the opportunities presented by the ‘lucky country’.

For more information visit the IGC website or the December 2010 issue of AusGeo News.

4. Workshop on new seismic and MT datasets in Victoria and South Australia

There will be a half day (morning) workshop on Friday 4 March 2011 in Melbourne to present the results of new seismic reflection and magnetotelluric data collected for the 2009 Southern Delamerian (L193) and Ararat (L194) Seismic Surveys across the Glenelg and Grampians-Stavely Zones of the Delamerian Orogen and the Stawell Zone of the western Lachlan Orogen. The workshop will be held in conjunction with GeoScience Victoria, AuScope and the Department of Primary Industries and Resources South Australia (PIRSA).

To obtain details on the workshop and to register please email leonie.jones@ga.gov.au; or phone +61 2 6249 9540.

5. GOMA Seismic and MT workshop abstracts and presentations now available

Extended abstracts are now available from the recently held GOMA (Gawler-Officer-Musgrave-Officer) Seismic and MT Workshop.

The seismic lines were collected as part of the Onshore Energy Security Program, in conjunction with PIRSA, AuScope and the Northern Territory Geological Survey. Results from MT surveys and inversion modelling, and implications of the datasets for regional energy systems are also included.

For further information, contact geoff.fraser@ga.gov.au; or phone +61 2 6249 9063.

6. Update on geophysical data releases

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

Minerals Alert Geophysical Surveys Table - survey boundary polygons in MapInfo TAB format.

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

7. About Minerals Alert

For more information, email paul.henson@ga.gov.au; or phone +61 2 6249 9138.

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Topic contact: media@ga.gov.au Last updated: October 4, 2013