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GILMORE Project GIS - Geoscience In Land management and Ore System Research for Exploration.

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: ANZCW0703003106

Title: GILMORE Project GIS - Geoscience In Land management and Ore System Research for Exploration.


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

The GILMORE project is a pilot study designed to test holistic systems approaches to mapping mineral systems and dryland salinity in areas of complex regolith cover.

The project is coordinated by Geoscience Australia, and involves over 50 scientists from 14 research organisations.

The project area lies on the eastern margin of the Murray-Darling Basin in central-west NSW. The project area was chosen for its overlapping mineral exploration (Au-Cu) and salinity management issues, and the availability of high-resolution geophysical datasets and drillhole materials and datasets made available by the minerals exploration industry.

The project has research agreements with the minerals exploration industry, and is collaborating with rural land- management groups, and the Grains Research and Development Corporation.

The study area (100 x 150 km), straddles the Gilmore Fault Zone, a major NNW-trending crustal structure that separates the Wagga-Omeo and the Junee-Narromine Volcanic Belts in the Lachlan Fold Belt. The project area includes tributaries of the Lachlan and the Murrumbidgee Rivers, considered to be two of the systems most at risk from rising salinities. This project area was chosen to compare and contrast salt stores and delivery systems in floodplain (in the Lachlan catchment) and incised undulating hill landscapes (Murrumbidgee catchment). The study area is characteristic of other undulating hill landscapes on the basin margins, areas within the main and tributary river valleys, and the footslopes and floodplains of the Murray-Darling Basin itself.

ANZLIC search words:

  • GEOSCIENCES Geology Research
  • GEOSCIENCES Geophysics Mapping

Spatial domain:

locality map

Geographic extent polygon: 147 -33.7, 148.1 -33.7, 148.1 -35, 147 -35, 147 -33.7,

Geographic bounding box:
North bounding latitude: -33.7 °
South bounding latitude: -35 °
East bounding longitude: 148.1 °
West bounding longitude: 147 °

Data currency

Beginning date: 1999-05-01

Ending date: 2003-08-01


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - gif Graphic Interchange Format (GIF) image
DIGITAL - shp ArcView shape file ArcView Geographic GDA94
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic GDA94
DIGITAL - bil Band interleaved by line (BIL) image Universal Transverse Mercator (UTM) WGS84
Available format type:
DIGITAL - gif Graphic Interchange Format (GIF) image
DIGITAL - ArcGIS-coverage ArcInfo coverage Geographic GDA94
DIGITAL - shp ArcView shape file ArcView Geographic GDA94
DIGITAL - bil Band interleaved by line (BIL) image Universal Transverse Mercator (UTM) WGS84

Access constraints:

Licence and fee required.

Order Product

Data quality

Lineage:

AIRBORNE ELECTROMAGNETICS (AEM) SURVEY

Data Acquisition and Processing

World Geoscience Corporation (WGC), now Fugro Airborne Surveys, flew the airborne electromagnetic survey under contract from January to March 1999 utilising the TEMPEST system developed by CRC AMET. The survey was flown at 150m line spacing along east-west lines. The nominal terrain clearance was 120m for the transmitter. The three component dB/dt towed bird receiver was towed 100 m behind and 5m below the aircraft. The TEMPESTsystem operated at a 25 Hz base frequency with a square waveform, 10 ms pulse width and average moment of 27,900 Am2. The sample rate of the receiver was 13 microseconds, giving the system a bandwidth of 25 Hz to 37.5 kHz. Streamed 13 microsecond data were recorded and later stacked into 0.2s (12 m) samples during processing. The stacked data were deconvolved using the high altitude reference waveform and the primary field was removed. These deconvolved ground response data were transformed to an equivalent B-field response for a perfect 100% duty cycle square wave. These data were binned into 15 windows with centres ranging from 13 microsecond to16.2 ms.

AIRBORNE GEOPHYSICAL DATA

Data have been compiled from 6 separate surveys.

Magnetic and Gamma-ray Spectrometric Data

The total magnetic intensity (TMI) point located data and each of the four channel (TC,K,U,TH) point located data for each survey were gridded separately at the optimal grid cell size of one fifth of the line spacing.

From the composite TMI grid, the following grids were derived;

-TMI reduced to the pole

-First vertical derivative of TMI-RTP

-Horizontal gradient of TMI

REGOLITH

Regolith landform units were compiled at 1:50 000 from interpretation of 1:60000 and 1:80 000 scale RC9 panchromatic aerial photographs and four weeks fieldwork. Subsidiary data was derived by analysis of drilling materials, down-hole geophysics, and airborne gamma-ray spectrometrics.

Positional accuracy:

POINT DATA

Drill hole coordinates were supplied by different companies using varying methods including surveying and GPS readings. Most were collected in AGD66 or ADGD84 datum, which was subsequently transformed to GDA94. A differential GPS was used for the holes drilled by AGSO/BRS and for some of the later industry holes, with sub-metre vertical and horizontal accuracy. The drillholes are a composite product, and the accuracy depends on the source of the data.

REGOLITH

The 1:100 000 topo base is based on AUSLIG 1:100 000 sheets. No analysis of the positional accuracy of features has been undertaken, however intuitively it is considered that about 95 per cent of all features are within 100 metres of their true position. Data is based on interpretation of 1:60 000 and 1:80 000 air photos.

Attribute accuracy:

POINT DATA

Attributes for the industry drill holes were taken from data supplied by the different companies. No attribute information was supplied, therefore accuracy is unknown. GA/BRS drillhole attributes were verified in the field. or were automatically populated. Automatic routines were used to extract the data from AGSOs corporate database and populate the GIS layer. Nearly all attributes for this data are intuitively considered to be correct.

REGOLITH

Classification is based on air photos, airborne geophysical imagery, field checking.

Logical Consistency:

POINT DATA

Many of the drill hole locations have been visually verified by overlaying them on an orthophoto. No other logical consistency checks have been undertaken.

REGOLITH

Both the geoscientist and the GIS technician have visually checked plots at various stages of the map production process to identify abnormal features positions, gaps in linework. The GIS package ArcInfo was used to do topological consistency checks to detect flaws in the spatial data structure and to flag them as errors. This check ensures that all classified polygons are closed, nodes are formed at the intersection of lines and that there is only one label within each polygon. There is a many to one relationship between the items LANDFORM, REGOLITH_TYPE, and INDURATION within individual regolith landform units (MAP_SYMB). This relationship is expressed in detail in the table "Attributes of ALL Regolith Landforms within each RL Unit" (ArcView version)

Completeness:

POINT DATA

Over 95% of drill holes received from industry are included in the dataset. Those not included were drill holes where the co-ordinates were unknown. Most of the attributes are complete, though around 10% of the drillhole data have an unknown dip and/or azimuth. Data has been supplied by different companies, therefore all fields for drill holes may not be considered to be complete, but all available data has been included.

REGOLITH

Data are complete to the specifications of the project.


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/ANZCW0703003106.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703003106.xml

GEOPHYSICAL SURVEY

Data have been compiled from 6 separate surveys.

1. GA Forbes Survey 1993. (GA Airborne Project Number 565) -flown by Geoscience Australia

2. GA/GSNSW Cootamundra Survey 1997/98. (GA Airborne Survey Project Number 681) -flown by Geoscience Australia

3. GA West Wyalong Detail Survey 1998. (GA Airborne Survey Project Number 697) -flown by Geoscience Australia

4. Cyprus Gold Temora North Survey 1996 (GA Airborne Survey Project Number 724)-flown by Kevron Geophysics

5. Cyprus Gold Temora South Survey 1992 (GA Airborne Survey Project Number 724) -flown by Kevron Geophysics

6. Cyprus Gold Junee Survey 1996 (AGSO Airborne Survey Project Number 724 -flown by Kevron Geophysics

REGOLITH

Due to the complexity of the geomorphology, a systematic integration of the gamma-ray spectrometrics and bedrock geology with landforms was not attempted as the level of detail of ground truthing required was outside the scope of this project. Broad lithological correlations are based on a combination of field site data, and the 1:250 000 Cootamundra Interpreted Geology map (Bacchin et al, 1999), the 1:250 000 Cootamundra Geological map (Warren et al., 1996), and the 1:250 000 Forbes Geological map (Duggan et al.,1999). Also, a few regolith landform unit boundaries were defined using gamma-ray spectrometrics in conjunction with field data. The data were captured from interpreted tracings made from 1:60 000 and 1:80 000 RC9 aerial photographs, airborne geophysical imagery, and field mapping data onto topographic bases at 1:50 000 derived from AUSLIG 1:100 000 topo sheets. Coverage added as a theme to ArcView project with extended look up table of data extracted from Geoscience Australia's RTMAP Oracle database.

For definitions of regolith types, landform types, induration and geomorphic features refer to: Pain C., Chan R., Craig M., Hazell M., Kamprad J., and Wilford J. (1991). RTMAP: BMR Regolith database field handbook. BMR Record 1991/29

ATTRIBUTE DESCRIPTIONS

Complies with Geoscience Australia's Data Dictionary Specifications Tables

Authors:Apps, H.E. Lawrie, K.C. Gibson, D.L. Brodie, R.C. Wilford, J. Tan, K.P. Chan, R.A. Highet, L.M.
SPATIAL INFORMATION FOR THE NATION