The Drybones Kimberlite: a case study of VTEM and ZTEM airborne EM results

Vlad Kaminski; Jean M. Legault; Harish Kumar

doi:10.1081/22020586.2010.12041915

ISSN: 2202-0586
E-ISSN:

oa The Drybones Kimberlite: a case study of VTEM and ZTEM airborne EM results
Authors Vlad Kaminski^a, Jean M. Legault^b and Harish Kumar^c
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^a Geotech Ltd., Aurora, ON, , CA, [email protected] ^b GeotechLtd., Aurora, ON, , CA, [email protected] ^c Geotech Ltd., Aurora, ON, , CA, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 4
DOI: https://doi.org/10.1081/22020586.2010.12041915
- Published online: 01 Dec 2010

Abstract

Summary

Two airborne EM surveys were conducted over the Drybones Kimberlite by Geotech Ltd. A VTEM helicopter time domain EM survey flown in 2005 is compared to a ZTEM helicopter tipper AFMAG EM survey flown in 2009. Both surveys detect anomalous responses over the pipe, however according to conductivity-depth transforms and skin-depth estimates, supported by 3D modeling, it seems unlikely that VTEM response is representative of the actual kimberlite, buried more than 100 meters underneath the conductive sediments. It appears that the consolidated kimberlite might be too resistive to be differentiated from granodiorites using conventional TEM methods. On the other hand the ZTEM response appears to be able to differentiate between the diatreme (consolidated kimberlite) and the host rock, lying below the conductive blanket.

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References

De Lugao, P. P., and Wannamaker, P. E., 1996, Calculating the two-dimensional magnetotelluric Jacobian in finite elements using reciprocity: Geophysics Journal. International, 127, 806-810.
Kaminski, V. F., 2000, Application of Airborne Geophysical methods to kimberlite exploration on the Canadian Shield: M.Sc. thesis, Moscow State University, published in Russian, 167 pp.
Karous, M.R., and Hjelt, S. E., 1983, Linear filtering of VLF dip-angle measurements: Geophysical Prospecting, 31, 782-794.
Kretschmar, U., 1995, Drill Report on the Drybones Bay Kimberlite Property, Drybones Bay, Great Slave Lake, District of MacKenzie, Northwest Territories, for Trade Wind Resources Ltd., Vancouver, BC: submitted to NWT Dept. Indian & Northern Affairs Mining Recorder, 36 pp.
Legault, J.M., Kumar, H., Milicevic, B., and Wannamaker, P.E., 2009, ZTEM tipper AFMAG and 2D inversion results over an unconformity uranium target in northern Saskatchewan: SEG Expanded Abstracts, 28, 1277-1281.
Lo, B., Legault, J.M., Kuzmin, P., and Combrinck, M., 2009, ZTEM (Airborne AFMAG) tests over unconformity uranium deposits: 20TH ASEG International Geophysical Conference & Exhibition, Adelaide, AU, Extended Abstract, 6 pp.
Lo, B., and Zang, M., 2008, Numerical modeling of Z-TEM (airborne AFMAG) responses to guide exploration strategies: SEG Expanded Abstracts, 27, 1098-1101.
Prikhodko, A., 2010, Conductivity Depth Imaging software (TEMRDI.gx): personal communication.
Ward, S. H., 1959, AFMAG - Airborne and Ground: Geophysics, 24, 761-787.
Witherly, K., Irvine, R., and Morrison, E.B., 2004, The Geotech VTEM time domain helicopter EM system: SEG Expanded Abstracts, 23, 1217-1221.

/content/journals/10.1081/22020586.2010.12041915

Article Type: Research Article

Keyword(s): AFMAG; airborne; electromagnetic; kimberlite.; VTEM; ZTEM

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