1887
Volume 27, Issue 2-3
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Examples of drillhole EM (DHEM) from the Eloise copper-gold ore deposit, Queensland, show how EM methods can contribute to exploration and resource evaluation drilling programmes, by determining existence and extent of conductive mineralisation above and below a drillhole, along strike and off-section.

Multiple conductors respond with differing transmitter coupling and time-constants, and can be identified by the use of multiple transmitter loops; an extreme example shows how four separate conductors can be identified in one drillhole with the use of five transmitter loops.

© 1996 ASEG
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1996-06-01
2026-01-19

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References

  1. Asten, M.W., 1991, A study of galvanic response in the TEM response of conductive ore-bodies: Abstracts of the Aust. Soc. of Expl. Geophys. 8th Conference, Sydney, 124.
  2. Asten, M.W., 1992, Interpretation of ground TEM data from conductive ter-ranes: Expl. Geophys. 23, 9-16.
  3. Brescianini, R.F., Asten, M.W. and McLean, N., 1992, Geophysical characteristics of the Eloise Cu-Au deposit, north-west Queensland: Expl. Geophys. 23, 33-42.
  4. Bishop, J.R., Lewis, R.J.G., and Macnae, J.C., 1987, Down-hole electromagnetic surveys at Renison Bell, Tasmania: Expl. Geophys. 18, 265-278.
  5. Crone, J.D., 1986, Field examples of drillhole pulse EM surveys used to detect and outline conductive ore deposits, in Kileen, P.G., Ed., Drillhole geophysics for mining and geotechnical applications: Geological Survey of Canada, Paper 85-27,59-70.
  6. Cull, J.R, 1993, Downhole three component TEM probes: Expl. Geophys. 24, 437-442.
  7. Duncan, A.C., 1987, Interpretation of down-hole transient EM data using current filaments: Expl. Geophys. 18, 36-38.
  8. Dyck, A.V. and West, G.F., 1984, The role of simple computer models in interpretation of wide-band drill-hole electromagnetic surveys in mineral exploration: Geophysics, 49, 957-980.
  9. Encom, 1992, SiroEx version 3.00, Users guide: Encom Technology, Sydney.
  10. Fullagar, P.K., 1987, Inversion of downhole TEM data using circular current filaments: Expl. Geophys. 18, 341-344.
  11. Nabighian, M.N. and Macnae, J.C., 1991, Time domain electromagnetic prospecting methods, in Nabighian, M.N., editor, Electromagnetic methods in applied geophysics Vol 2A, 427-520. Tulsa, Soc. Expl. Geophys.
  12. Silic, J., 1989, Interpretation of TDEM data using first and second spatial derivatives and time decay analysis: Expl. Geophys. 20, 57-64.
  13. Thomas, L., 1987, A simple interpretation aid for downhole time-domain electromagnetic anomalies: Expl. Geophys. 18, 349-352.
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  • Article Type: Research Article
Keyword(s): borehole EM; copper-gold; drillhole EM; drillhole logging; Eloise; Sirotem; three component; transient electromagnetic

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