An assessment of ZTEM and time domain EM results over three mineral deposits

Ken Witherly; Daniel Sattel

doi:10.1071/ASEG2013ab290

ISSN: 2202-0586
E-ISSN:

oa An assessment of ZTEM and time domain EM results over three mineral deposits
Authors Ken Witherly^a and Daniel Sattel^b
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^a Condor Consulting, Inc., Lakewood, CO, USA, [email protected] ^b EM Solutions LLC, Golden, CO, USA, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2013, Issue ASEG2013 - 23rd Geophysical Conference, Dec 2013, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2013ab290
- Published online: 01 Dec 2013

Abstract

The ZTEM airborne EM system was introduced into commercial service by Geotech Ltd. in late 2007. ZTEM is unlike any other commercial EM system in that it relies on the measurement of natural occurring EM fields in the AFMAG frequency range of 25-720 Hz.

As a result of using natural EM fields that pass through the earth as plane waves, the ZTEM system response shares similarities and important differences to traditional inductive source EM systems such as VTEM or MegaTEM, used extensively by the minerals industry to explore for targets of high conductance. While ZTEM can detect discrete conductors like inductive systems, it also responds to bulk changes in resistivity and conductivity gradients that often characterize geological contacts or structures.

One of the key means assess how a new technology performs is to compare the new outcomes with results from well-understood techniques. In this review, ZTEM data will be compared with data from three different airborne TEM systems over three deposits.

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2026-01-24

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References

Legault, J. 2010 ZTEM Tipper AFMAG Results over the Morrison Copper/Gold Porphyry deposit; internal report for Geotech Ltd. July 2010.
Legault, J., Wilson, G.A., Gribenko, A.V., Zhdanov, M.Z., Zhao, S. and Fisk, K. 2012, An overview of the ZTEM and AirMT systems - A case study from the Nebo-Babel Ni-Cu- PGE deposit, West Musgrave, Western Australia, in R. J. L. Lane (editor), Natural Fields EM Forum 2012: Abstracts from the ASEG Natural Fields EM Forum 2012: Published by Geoscience Australia, Geoscience Australia Record 2012/04. MagSilver Corp.: http://www.magsilver.com
Pacific Booker Minerals Inc.: http://www.pacificbooker.com/
Robertson, K., and Megaw, P. 2009, Cinco de Mayo: A new silver, lead, and zinc discovery in northern Mexico, The Leading Edge June 2009.
Rudd, J and Sterritt, V. 2009 Report on a Helicopter-Borne Magnetic and Electromagnetic Survey, Quest West, BC, by Aeroquest Surveys, January 2009 produced for Geoscience BC. Quest-West Project 2009.
Sattel, D., Witherly, K., and Becken M., 2010, A brief analysis of ZTEM data from the Forrestania test site, WA: 21st International Geophysical Conference and Exhibition, ASEG, Extended Abstracts.
Seat, Z, Beresford, S.W., Grguric, B.A., Waugh, R.S., Hronsky, J.M.A., Mary Gee. M.A., Grove, D.I., & Mathison, C. I. 2007 Architecture and emplacement of the Nebo-Babel gabbronorite- hosted magmatic Ni-Cu-PGE sulphide deposit, West Musgrave, Western Australia Miner Deposita (2007) 42:551-581.

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Article Type: Research Article

Keyword(s): AFMAG; airborne TEM; conductive mineral deposits; ZTEM

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oa An assessment of ZTEM and time domain EM results over three mineral deposits

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