1887
Volume 22, Issue 1
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

The transition to fully digital data acquisition systems has been the major advance in virtually all areas of geophysics. In 1985, GEOTEM*, the first fully digital airborne EM system, was introduced into commercial operation. Geoterrex commissioned an Australian based GEOTEM system in 1989. Over 250,000 line kilometres of survey have now been flown with the system allowing a greater appreciation of the advantages of a fully digital operation.

Data acquired over the Freddie Well massive sulphide deposit, near Mt Magnet in Western Australia, provide a good example of the advantages of new technology applied to the detection of difficult targets. The deposit was undetected by the early versions of the Mark V and Mark VI INPUT* receivers. The enhanced Mark V receiver detected the deposit though the response never dominated the high amplitude response of the adjacent overburden. The GEOTEM survey, which employed dual transmitter frequencies of 75 Hz and 125 Hz, clearly detected the deposit with late channel response exceeding the amplitude of the surrounding conductive cover.

© 1991 ASEG
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1991-03-01
2026-01-19

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References

  1. Annan, A. P., (1990). ‘Benefits derived from the use of a fully digital transient airborne EM system’. Abstracts of the 60th Annual Meeting of the Society of Exploration Geophysicists, San Francisco, 693-695.
  2. Annan, A. P., (1986). ‘Development of the PROSPECT I Airborne Electromagnetic System’. In: Palacky, G. J., Ed., Airborne Resistivity Mapping, Geological Survey of Canada, Paper 86-22, 63-69.
  3. Annan, A. P., and Lobach, J., (1985). ‘Experiments with a new general purpose digital EM receiver’. Abstracts of the 55th Annual Meeting of the Society of Exploration Geophysicists, Washington, D.C., 80-81.
  4. Best, M. E., and Bremner, J. T, (1986). ‘Resistivity Mapping Using the SWEEPEM Airborne System’. In: Palacky, G. J., Ed., Airborne Resistivity Mapping, Geological Survey of Canada, Paper 86-22, 63-69.
  5. Butt, G., (1985). ‘Case histories showing various applications of a combined INPUT magnetometer spectrometer airborne geophysical system in Australia’. Explor. Geophys., 16,160-183.
  6. Reynolds, D. G., Brook, W. A., Marshall, A. E., and Allchurch, P. D., (1975). ‘Volcanogenic copper-zinc deposits in the Pilbara and Yilgarn Archaean Block’. In: Knight, C. L., Ed., Economic Geology of Australia and Papua New Guinea, 1. Metals, Aus. I.M.M. Monograph, 5, 185-195.
  7. Lazenby, P. G., and Becker, A., (1983a). ‘Redefinition of the INPUT System: Part A - Instrumentation’. In: Exploration Technology Program of the Board of Industrial Leadership and Development, Summary of Research 1981-1983, Ontario Geological Survey Miscellaneous Paper 115, 1-9.
  8. Lazenby, P. G., and Becker, A., (1983b). ‘Redefinition of the INPUT System: Part B - Signal Processing and Field Results‘. In: Exploration Technology Program of the Board of Industrial Leadership and Development, Summary of Research 1981-1983, Ontario Geological Survey Miscellaneous Paper 115, 10-16.
  9. Thompson, S. J., (1987). ‘A new airborne transient EM system‘. Abstracts of the 40th Meeting of the European Association of Exploration Geophysicists, Belgrade, Yugoslavia.
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  • Article Type: Research Article
Keyword(s): airborne; digital system; Freddie Well; GEOTEM; INPUT; TEM; transient

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