East Isa VTEM Plus helicopter-borne versatile time domain electromagnetic and magnetic geophysical survey

From June 23rd to November 4th 2016 Geotech Ltd. carried out a helicopter-borne geophysical survey over part of East Isa in Queensland (figure 1). Operations were based at Cloncurry, Queensland. The traverse lines were flown in an east to west (N 90° E azimuth) direction with 2km and 2.5km traverse line spacings, with three Tie lines flown perpendicular to the traverse lines. During the survey the helicopter was maintained at a mean altitude of 76 metres above the ground with an average survey speed of 90 km/hour. This allowed for an actual average EM Transmitter-receiver loop terrain clearance of 38 metres and a magnetic sensor clearance of 68 metres.

The principal geophysical sensors included a versatile time domain electromagnetic (VTEMTMPlus) full receiver-waveform system, and a caesium magnetometer. Ancillary equipment included a GPS navigation system, laser and radar altimeters, and inclinometer. A total of 15697 line-kilometres of geophysical data were acquired during the survey. The electromagnetic system is a Geotech Time Domain EM (VTEMplus) with full receiver-waveform streamed data recording at 192 kHz. The "full waveform VTEM system" uses the streamed half-cycle recording of transmitter current and receiver voltage waveforms to obtain a complete system response calibration throughout the entire survey flight. The VTEM transmitter loop and Z-component receiver coils are in a concentric-coplanar configuration and their axes are nominally vertical. An X-component receiver coil is also installed in the centre of the transmitter loop, with its axis nominally horizontal and in the flight line direction. The receiver coils measure the dB/dt response, and a B-Field response is calculated during the data processing.

In-field data quality assurance and preliminary processing were carried out on a daily basis during the acquisition phase. Preliminary and final data processing, including generation of final digital data products were undertaken from the office of Geotech Ltd. in Aurora, Ontario. A set of Conductivity Depth Images (CDI) were generated using EM Flow version 3.3, developed by Encom Technologies Pty Ltd. A total of forty-five (45) dB/dt Z component channels, starting from channel 4 (21 µsec) to channel 48 (10667 µsec), were used for the CDI calculation. An averaged waveform at the receiver was used for the calculation since it was consistent for the majority of the flights with minor deviation from the average.

Digital data includes all electromagnetic and magnetic data, conductivity imaging products, mulitplots plus ancillary data including the waveform.

Identification info

Date (Creation): 2017-03-16T16:00:00

Date (Publication): 2017-04-10T11:00:00

Citation identifier: Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/104700

Cited responsible party

Role	Organisation / Individual Name	Details
Author	McInnes, D.	1

Purpose: The data release and conductivity depth image information are intended for use by exploration industry stakeholders

Status

Point of contact

Role	Organisation / Individual Name	Details
Custodian	McInnes, D. Commonwealth of Australia (Geoscience Australia)	Voice

Role

Organisation / Individual Name

Details

Custodian

McInnes, D.

Commonwealth of Australia (Geoscience Australia)

Voice

Spatial representation type: Text, table

Spatial resolution

Level of detail: NA

Topic category

Geoscientific information

Extent

Temporal extent

Time period: 2016-06-23T00:00:00 2016-11-04T23:59:00

Extent

Maintenance and update frequency: As needed

Resource format

Title: Product data repository: Various Formats

Website: Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

Place

East Isa

Platform

Geotech

Product

Keywords

VTEM

Keywords

VTEM Plus

Keywords

Heliborne

Keywords

versatile time-domain electromagnetic

Keywords

geophysical survey

Australian and New Zealand Standard Research Classification: Fields of Research

Earth Sciences

Keywords

Cloncurry

Keywords

Queensland

Keywords

Mount Isa

Keywords

Mt Isa

Keywords

Conductivity Depth Image

Keywords

EMflow

Keywords

Published_External

Resource constraints

Title: Creative Commons Attribution 4.0 International Licence

Alternate title: CC-BY

Edition: 4.0

Website

http://creativecommons.org/licenses/

Access constraints: License

Use constraints: License

Resource constraints

Title: Australian Government Security ClassificationSystem

Edition date: 2018-11-01T00:00:00

Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification: Unclassified

Language: English

Character encoding: UTF8

Distribution Information

Distributor contact

Role	Organisation / Individual Name	Details
Distributor	Commonwealth of Australia (Geoscience Australia)	Voice

OnLine resource: EM Flow® Conductivity Depth Imaging Data

EM Flow® Conductivity Depth Imaging Data

OnLine resource: Gridded data (ers)

Gridded data (ers)

OnLine resource: Point location data

Point location data

OnLine resource: Operations and Processing Report

Operations and Processing Report

Distribution format

OnLine resource: Multiplot data

Multiplot data

OnLine resource: Readme

Readme

Distribution format

OnLine resource: Waveform data

Waveform data

OnLine resource: Point-located derived B-field data

Point-located derived B-field data

OnLine resource: Point-located dB/dt data

Point-located dB/dt data

OnLine resource: Point-located electromagnetic data

Point-located electromagnetic data

OnLine resource: Point-located derived B-field subsampled data

Point-located derived B-field subsampled data

OnLine resource: Point-located dB/dt subsampled data

Point-located dB/dt subsampled data

OnLine resource: Point-located electromagnetic subsampled data

Point-located electromagnetic subsampled data

Resource lineage

Statement: Data was acquirde by Geotech, final data processed by Geotech, Reviewed for quality and release by David McInnes of GA

Hierarchy level: Dataset

Metadata constraints

Title: Australian Government Security ClassificationSystem

Edition date: 2018-11-01T00:00:00

Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification: Unclassified

Metadata

Metadata identifier

urn:uuid/3bcfc711-6549-400d-b3a2-9deb8ac90825

Title: GeoNetwork UUID

Language: English

Character encoding: UTF8

Contact

Role	Organisation / Individual Name	Details
Point of contact	Crowe, M.C.A. Commonwealth of Australia (Geoscience Australia)	Voice

Role

Organisation / Individual Name

Details

Point of contact

Crowe, M.C.A.

Commonwealth of Australia (Geoscience Australia)

Voice

Type of resource

Resource scope: Dataset

Name: Contractor supplied data

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier: eCatId/104700

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/3bcfc711-6549-400d-b3a2-9deb8ac90825

Date info (Creation): 2017-03-16T13:14:39

Date info (Revision): 2018-04-22T08:31:32

Metadata standard

Title: AU/NZS ISO 19115-1:2014

Metadata standard

Title: ISO 19115-1:2014

Metadata standard

Title: ISO 19115-3

Title: Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition: Version 2.0, September 2018

Citation identifier: https://pid.geoscience.gov.au/dataset/ga/122551

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Read here the full details and access to the data.

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