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Ballard geological map, digital dataset

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: ANZCW0703002926

Title: Ballard geological map, digital dataset


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

Mapping of outcrop geology on Ballard 3039 1:100 000 map sheet in the Eastern Goldfields, Western Australia, as part of the National Geoscience Mapping Accord (NGMA).

Briefly, mapping consists of geological boundaries/units, faults, fractures, folds, veins, dykes, joints, linears, marker beds, trends, structural measurements, and mineral deposits.

ANZLIC search words:

  • GEOSCIENCES Geology Mapping

Spatial domain:

locality map

Geographic extent polygon: 120.5 -29, 121 -29, 121 -29.5, 120.5 -29.5, 120.5 -29,

Geographic bounding box:
North bounding latitude: -29 °
South bounding latitude: -29.5 °
East bounding longitude: 121 °
West bounding longitude: 120.5 °

Data currency

Beginning date: 1967-01-01

Ending date: 2000-06-30


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic AGD66
Available format type:
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic AGD66

Access constraints:

Licence required.

Free Data Download

Data quality

Lineage:

Geological themes in the western third of the area were generated from field observations and interpretation using aerial photographs (1:25 000 colour) by M.S.Rattenbury in 1990 and A.J.Stewart in 1996; a 1:24 000-scale geological map of Mount Ida greenstone belt south of Lake Ballard prepared by CRA Exploration Pty Ltd 1967, a 1:10 000-scale geological map of the central part of the Mount Ida greenstone belt between 6773000N and 6754000N prepared by M.Gole et al. (CRA exploration Pty Ltd 1973), and field observations by S.Wyche (GSWA) in 1995.

In eastern two-thirds of area, geological themes were generated from field observations and interpretation using aerial photographs (1:50 000 b/w), Menzies 1:250 000 geological map 1st edition (Kriewaldt 1971, GSWA), Menzies 1:250 000 regolith-landforms map (Craig and Churchward 1995, AGSO), and satellite imagery (Landsat TM). Geophysical themes were generated from magnetic data (90-m cell size grids derived from airborne magnetic surveys). Mineral deposit locations and information are largely sourced from GSWA data modified by field and air-photo observations. Topographic themes have been provided by AUSLIG and DOLA. Some amendments to that topographic data have been made by the authors. Lineage of topographic data, before receipt from AUSLIG and DOLA, is uncertain. Maps were compiled from unrectified photo-overlays on to topographic bases supplied by AUSLIG and DOLA (see notes on topographic data above). Drainage and, where necessary, other topographic features (e.g., fence lines) were used for spatial control of the geological data. Compilations were digitally captured by scanning and vectorising procedures. Point data with database origins have been located largely by non-differential GPS. Some detail may have been generalised, repositioned, or omitted from the primary data for cartographic purposes.

Positional accuracy:

The most prominent horizontal positional inaccuracy in this dataset has been introduced during compilation to topographic base maps, and is estimated at up to 300 m. The main source of error is inaccuracies in the location of topographic features on the base maps, which is compounded by insufficient topographic features in some areas of the base maps with which to accurately align the photo-overlays. Positional errors generated by distortions in the aerial photos and errors during the data capture process are difficult to quantify, and are believed to be negligible in comparison to the topo base error.

GPS-located features, such as structural measurements, have an error of up to 100 m due to selective availability imposed on GPS readings. The mineral deposit locations supplied by GSWA have been checked by AGSO geologists during map production using aerial photographs and topographic base maps as a spatial control.

Attribute accuracy:

The bulk of attributes in this dataset are qualitative and quantitative geological observations and measurements. Classifications of lithology and linear geological features are largely interpretative, based on conventional mapping techniques (field observations, photo/imagery interpretation, sample collection and analysis), and adhere to well established and standardised classification schemes. Structural measurements are quantitative, measured using standard field mapping instruments.

Logical Consistency:

Rigorous quality control has ensured consistency in data structures and standards across the dataset.

Revisional mapping on many of the earlier mapped sheets has been carried out to achieve consistency in geological classifications across the dataset.

Completeness:

The level of work undertaken to map the project area varies according to the nature of the geology. Areas with large amounts of outcrop have been mapped with numerous field observations, while those tracts of land with little or no outcrop have been mapped with few or no field observations. Reliability and/or Field Observation Localities diagrams are included with each hardcopy release of a map sheet to display the distribution of different levels of mapping.


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/ANZCW0703002926.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703002926.xml

Additional Metadata- ASCII files containing additional metadata are stored with digital data for each sheet.

Authors:Rattenbury, M.S. Stewart, A.J.
SPATIAL INFORMATION FOR THE NATION