1887
ASEG2009 - 20th Geophysical Conference
  • ISSN: 2202-0586
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Abstract

Introduction

The fixed-wing MEGATEM airborne transient electromagnetic (EM) system was introduced in 1998 (Smith et al., 2003) as a four-engine version of the GEOTEM system (.Annan and Lockwood, 1991). The four engines were required so that the system could fly safely at high altitudes in the Andes Mountains (Smith et al., 2003). The larger aircraft required to carry four engines was also able to carry a larger transmitter loop, so the dipole moment of the system increased to more than one million Am2 - hence the name MEGATEM. However, the aircraft was also able to draw power from more generators and carry heavier more powerful transmitter electronics, so a further increase was achieved in 2001 so that the dipole moment became more than two million Am2 (Smith et al., 2003). As a consequence, the system name was modified to MEGATEMII. Figure 1 shows the MEGATEM system with the EM transmitter and receiver labeled. The system also flies with a magnetometer for measuring the intensity of the earth’s field.

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2009-12-01
2026-01-15

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References

  1. Annan, A.P. and Lockwood., R., 1991. An application of airborne GEOTEM in Australian conditions: Exploration Geophysics 22. 5-12.
  2. Cheng, L.Z., Smith, R.S., Allard, M., Keating, P., Chouteau, M., Lemieux, J., Vallée, M.A., Bois, D., Fountain D.K., 2006, Geophysical case study of the Iso and New Insco deposits, Québec, Canada: Part I, data comparison and analysis. Exploration and Mining Geology 15, nos 1-2, 53-63.
  3. Cheng, L.Z., Smith, R.S., Allard, M., Keating, P., Chouteau, M., Lemieux, J., Vallée, M.A., Bois, D., Fountain D.K., 2007, Geophysical case study of the Gallen deposit, Québec, Canada: Exploration and Mining Geology, 16, nos 1-2, 67-81.
  4. Keating, P., Dumont, R., and Houle, P., 2007, A comparison between old and recent airborne time-domain electromagnetic surveys flown in the Chibougamau region, eastern Canada: In Milkereit, B. (Ed), Proceedings of Exploration 07: Fifth Decennial International Conference on Mineral Exploration, 863-867.
  5. Smith, R.S., and Koch, R., 2006, Airborne EM measurements over the Shea Creek uranium prospect, Saskatchewan, Canada. SEG Expanded Abstracts 25, 1263.
  6. Smith, R.S., and Lee, T.J., 2002, The moments of the impulse response: a new paradigm for the interpretation of electromagnetic data: Geophysics 67, 1095-1103.
  7. Smith, R., Fountain, D., and Allard, M., 2003, The MEGATEM fixed-wing transient EM system applied to mineral exploration: a discovery case history. First Break 21, July, 73-77.
  8. Smith, R., Wood, G., Powell, B., 2008, A comparison of TEMPEST and MEGATEM airborne electromagnetic data with ground resistivity data over the Millennium deposit. AEM 2008: 5th Int. Conf. on airborne electromagnetics, Haikko, Finland.
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  • Article Type: Research Article
Keyword(s): airborne; base metals; case history.; electromagnetic methods; fixed-wing; mineral exploration

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