The geotech VTEM time domain helicopter em system

Ken Witherly; Richard Irvine; Edward Morrison

doi:10.1071/ASEG2004ab162

ISSN: 2202-0586
E-ISSN:

oa The geotech VTEM time domain helicopter em system
Authors Ken Witherly^a, Richard Irvine^b and Edward Morrison^c
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^a Condor Consulting, Inc., , USA, [email protected] ^b Condor Consulting, Inc., , USA, [email protected] ^c Geotech Ltd., , Canada, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2004, Issue ASEG2004 - 17th Geophysical Conference, Dec 2004, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2004ab162
- Published online: 01 Dec 2004

Abstract

The Geotech Ltd. VTEM heli-time domain EM system entered into commercial service in late 2002 after a development program that started in early 2001. Since then, the system has performed surveys in Canada, the USA, Brazil and southern Africa for a range of mineral deposit styles in a variety of geological settings.

The VTEM system bears similarity to many of the past and currently operating heli-time domain system designs but has focused more than other developments on operational simplicity and flexibility in how the system is configured. A very high dipole (coupled with very low system noise levels) is deemed a major differentiating factor of the system compared with others in current operation.

In terms of applications, VTEM is seen as an effective bridge between existing airborne electromagnetics technologies, combining the high spatial resolution associated with helicopter systems but with a depth of investigation similar to what fixed wing time domain systems were traditionally required to achieve.

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2004-12-01

2026-01-24

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References

Boyd, G. (2001) Normandy Heli-borne time domain EM system; 2001, 15th Geophysical Conference, Aust. Soc. Explor. Geophys.
Eaton, P., Anderson, B., Nilsson, B., Lauritsen, E., Queen, S. and Barnett, C, 2002, NEWTEM - A novel time-domain helicopter electromagnetic system for resistivity mapping, 72nd Ann. Internal Mtg: Soc. of Expl. Geophys., 1-4.
Hogg, S., 1989, New helicopter-towed multigeometry transient electromagnetic system, 59th Ann. Internal Mtg: Soc. of Expl. Geophys., 145.
Irvine, R. I, Godbout, M. G., and Witherly, K. E., 2000, "Reid-Mahaffy Field Guide" Comparison of airborne EM systems, Reid-Mahaffy test site, Ontario, Canada. Report 2000-5, Condor Consulting Inc. Denver CO, USA
Reford, S. W., and Fyon, A., 2000, Airborne magnetic and electromagnetic surveys, Reid-Mahaffy airborne geophysical test site survey, Miscellaneous Release - Data (MRD) 55, Geological setting, measured and processed data, and derived products, Ontario Geological Survey, Sudbury, Ontario, Canada.

/content/journals/10.1071/ASEG2004ab162

Article Type: Research Article

Keyword(s): airborne electromagnetics; minerals exploration; time domain; VTEM

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