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Southern Northern Territory uranium and geothermal energy systems assessment digital data package

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.


Dataset citation

ANZLIC unique identifier: ANZCW0703016155

Title: Southern Northern Territory uranium and geothermal energy systems assessment digital data package


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

The potential of the southern Northern Territory for uranium and geothermal energy systems has been assessed.

Assessments for four targeted uranium systems (sandstone-hosted, uranium-rich iron oxide-copper-gold, unconformity-related and magmatic-related) were undertaken in a 2D, GIS-based environment using a mineral systems framework. The framework consists of four key mineral system components: 1) sources (s), 2) fluid-flow drivers (d), 3) fluid-flow pathways and architecture (p), and 4) depositional sites and mechanisms (t). Using this mineral systems framework, criteria are developed which are interpreted to reflect mineralising processes. These have been assigned weightings based on the interpretation of the importance of the criterion (I), the validity of the mappable geological proxy used to map the criterion (A), and the confidence in the data source (C). Values for I, A and C are assigned subjectively on a scale between zero and one. The final weighting for the criterion (W) represents the product of I, A and C. Following criteria development and the assignment of weightings, mappable criteria are combined into each of the four key system components (s, d, p and t), representing the sum of the weightings for the input mappable criteria normalised by the number of criteria. Weightings for the four system components are added together to generate the final uranium potential map (Final_Union).

The assessment for hot rock geothermal systems was undertaken in a 3D environment, with temperatures at depth predicted using the 3D GeoModeller software package. Heat production and thermal conductivity are used in the thermal modelling process. Heat production was calculated using radiometric data and also assigned to the 3D map. Thermal-conductivity values were assigned to each unit of the 3D map and were sourced from published measurements or estimated from lithological descriptions. The four kilometre depth slice has been used to represent hot rock geothermal prospectivity. Temperature values have been reclassified, with a colour stretch between the minimum and maximum modelled values (103-134 degrees C) used.

In addition to the modelled temperature at depth, a map has also been produced which represents the relative confidence in the hot rock geothermal assessment. This has been derived from a combination of the certainty in each of the component layers used throughout the assessment: geology, thermal properties, depth of cover, and the thermal modelling residual (measured minus modelled values).

This data is freely available from Geoscience Australia under the Creative Commons Attribution 3.0 Australia Licence.

ANZLIC search words:

  • ENERGY Exploration
  • MINERALS Exploration

Spatial domain:

locality map

Geographic extent name: NORTHERN TERRITORY - NT - State or Territory - Northern Territory

Geographic extent polygon: 131.1667 -21.8333, 135.9167 -21.8333, 135.9167 -26, 131.1667 -26, 131.1667 -21.8333,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:
North bounding latitude: -21.8333 °
South bounding latitude: -26 °
East bounding longitude: 135.9167 °
West bounding longitude: 131.1667 °

Data currency

Beginning date: Not Known

Ending date: Not Known


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - gdb ArcGIS file geodatabase ArcGIS Geographic GDA94
DIGITAL - ers ER Mapper raster dataset ER Mapper Geographic GDA94
Available format type:
DIGITAL - ers ER Mapper raster dataset ER Mapper Map Grid of Australia (MGA) GDA94
DIGITAL - gdb ArcGIS file geodatabase ArcGIS Map Grid of Australia (MGA) GDA94
DIGITAL - tab MapInfo Native Format, MapInfo table file MapInfo Map Grid of Australia (MGA) GDA94

Access constraints:

? Commonwealth of Australia (Geoscience Australia) year of publication.

With the exception of the Commonwealth Coat of Arms and where otherwise noted, this product is provided under a Creative Commons Attribution 3.0 Australia Licence.

http://creativecommons.org/licenses/by/3.0/au/legalcode

Free Data Download

Data quality

Lineage:

Criteria for the uranium systems assessment were developed from geological, geochemical and geophysical data. Solid geology was compiled for the study area using existing solid geology datasets published by the Northern Territory Geological Survey, Geoscience Australia's 1:1 000 000 surface geology of Australia map and geophysical imagery. Additional information on the compilation of solid geology for the assessment is provided in the accompanying report. Geochemical data were compiled from Geoscience Australia's OZCHEM dataset (http://www.ga.gov.au/meta/ANZCW0703011055.html#distinfo), and were supplemented by a small number of samples from the Northern Territory Geological Survey's open-file geochemical dataset (accessed at http://geoscience.nt.gov.au/GeosambaU/strike_gs_webclient/default.aspx). Radiometric, magnetic and gravity data were also used to develop some criteria. These data were sourced from Geoscience Australia databases and are publicly available via the Geoscience Australia website. Derivative products of the input datasets were developed for the uranium assessments (e.g., buffering). Decisions concerning the development of these derivatives, such as the selection of buffer distances and assignment of cutoff values, were made subjectively based on the scientific judgement of the analyst. Further details of these are given in the respective sections of the accompanying report for each system.

Hot rock geothermal prospectivity is derived from the modelled temperature at 4 km depth slice extracted from a 3D thermal model. The thermal modelling was performed using a 3D geological map constructed from geological and geophysical data to a depth of 15 km. The 3D map incorporates geological elements which were assigned heat-production and thermal-conductivity values. Thermal-conductivity values were assigned to each unit of the 3D map and were sourced from published measurements or estimated from lithological descriptions. Heat production was calculated using radiometric data sourced from Geoscience Australia and also assigned to the 3D map. Interpreted depth of sedimentary cover was determined using modelled depth to magnetic basement, seismic data and a digital elevation model sourced from Geoscience Australia.

Positional accuracy:

Unknown

Attribute accuracy:

Unknown

Logical Consistency:

Unknown

Completeness:

Complete


Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address: sales@ga.gov.au

Metadata information

Metadata date: 2013-03-08


Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703016155.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703016155.xml

Authors:Schofield, A. Chopping, R.G. Connolly, D.P. Gallagher, R.G. Gerner, E.J. Huston, D.L. Lewis, B. Meixner, A.J. Mernagh, T.P. Weber, R.D. Whelan, J.A.
SPATIAL INFORMATION FOR THE NATION