Minerals Alert November 2012

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

  1. Geo-Region of the month – Yilgarn Craton, Western Australia
  2. Seismic and magnetotelluric data released for Southern Carnarvon Survey in Western Australia
  3. Update on geophysical data releases
  4. About Minerals Alert

1. Geo-Region of the Month – Yilgarn Craton, Western Australia

Each month Geoscience Australia will highlight a range of significant products relating to key Australian mineral provinces which have been released over the past 10 years and may be of interest to current explorers.

This month’s Geo-Region is the highly endowed Yilgarn Craton in Western Australia. The work was conducted as part of the National Geoscience Agreement with the Geological Survey of Western Australia and the Predictive Mineral Discovery Cooperative Research Centre. The highlighted products, which are available as a free download, include:

  1. 3D models of the Eastern Goldfields Superterrane. This report documents the 3D architecture of the Eastern Goldfields Superterrane via a series of regional 3D geological and geophysical models. The report includes interpretation of the 01GANY1 seismic line between Leonora and Lake Yeo (via Laverton) and a discussion on how to build 3D models.
  2. Structural history of the Eastern Goldfields Superterrane. This report is the public release of the AMIRA P763 and pmd*CRC Y1 project. Some 80 key sites are documented with structural data, interpretations, maps, synthesis charts and photographs. A number of the sites are now flooded open pits, making this report is an important record of these sites.
  3. Gold mineral systems targets of the Eastern Goldfields Superterrane. This report is the integration and culmination of eight years of applied research on integrated mineral systems in the Eastern Goldfields. The report produced a series of well-constrained 3D maps at a variety of scales that integrated the structural–stratigraphic history and the alteration–fluid history with the evolution of the architecture. Using this scale integrated approach, a cascading sequence of gold exploration criteria from the province, district, near-mine to the ore-shoot scale were developed. These criteria have generic applications to exploration in other terranes.
  4. Eastern Yilgarn metamorphic evolution. This document reports on the Metamorphic Evolution of the Eastern Yilgarn Craton and includes a metamorphic map and a total-strain map. The spatial and temporal patterns documented from metamorphic rocks contribute fundamental insights into the history and likely tectonic setting of the region, It also provides information on the fluid history of the crust and associated mineralisation events. This metamorphic study has contributed significantly to understanding the world-class gold mineral systems of the region.
  5. Yilgarn Craton aeromagnetic interpretation map 1:1.5 M scale. This report covers interpretation of the full geophysical extent of the Yilgarn Craton, and also most of the Albany-Fraser province to the south-southeast.
  6. West Yilgarn deep seismic reflection and magnetotelluric lines. The Youanmi deep seismic reflection survey acquired by the Geological Survey of Western Australia includes images of three individual seismic lines (YU1, YU2 and YU3) across the northern part of the Yilgarn Craton from the Narryer Terrane in the northwest, major bounding and internal structures of the Youanmi Terrane and into the Kalgoorlie Terrane of the Eastern Goldfields Superterrane. The lines cross the Windamurra intrusive complex. The interpretation of these seismic lines, their integration with geophysical and geological data, and the implication for mineral systems in this area will be presented in a one-day workshop to be held in Perth on 27th February 2013.

For further information, please email narelle.neumann@ga.gov.au ; or phone +61 2 6249 9429.

2. Seismic and magnetotelluric data released for Southern Carnarvon Survey in Western Australia

The Southern Carnarvon Survey was acquired in 2011 under Geoscience Australia’s Onshore Energy Security Program in collaboration with the Geological Survey of Western Australia (GSWA) as part of the National Geoscience Agreement. Funding came from the Onshore Energy Security Program. The survey consists of a 260 kilometre line across the Byro Sub basin which is the onshore component of one of Australia’s most productive hydrocarbon provinces, the Southern Carnarvon Basin. The new data will expand scientific knowledge about potential water resources, geothermal sites and hydrocarbon and mineral resources in the area. The results will help to improve the understanding also of the Woodleigh Impact structure.

The processed SEG Y data, TIFF images and location information are available as a free download from the Seismic Acquisition and Processing Project.

Interpretations of the seismic sections and magnetotelluric models undertaken by GSWA and Geoscience Australia geologists will be released in February 2013 at a Public Workshop in Perth, Western Australia.

For further information please email tristan.kemp@ga.gov.au or phone +61 2 6249 9029.

3. Update on geophysical data releases

Geoscience Australia is managing the data acquisition programs in New South Wales, Queensland, Western Australia and the Northern Territory.

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

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

To obtain further details on the survey acquisition, please email murray.richardson@ga.gov.au or phone +61 2 6249 9229.

4. About Minerals Alert

For more information, email roger.skirrow@ga.gov.au; or phone +61 2 6249 9442.

To read past editions of Geoscience Australia's Minerals Alert, visit the Minerals Alert Newsletter Archive.

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