A rotating dipole survey of the Elura prospect, Cobar, NSW

S. H. Hall

doi:10.1071/EG9804112

ISSN: 0812-3985
E-ISSN: 1834-7533

A rotating dipole survey of the Elura prospect, Cobar, NSW
Authors S. H. Hall^a
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^a Department of Geology & Mineralogy, University of Queensland
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 11, Issue 4, Dec 1980, p. 112 - 118
DOI: https://doi.org/10.1071/EG9804112
- Published online: 01 Dec 1980

Abstract

Rotating current dipole phase and field strength results are presented for three dipole sites occupied at the Elura prospect, Cobar, N.S.W. For the production of contoured anomalies, rectangular grid networks of phase differences and field strength ratios were corrected for closure errors and then reconstituted to phase and field strength in order to restore the inherent cylindrical symmetry of the rotating dipole field. Phase residuals are defined by removing the phase of a theoretical primary field based on the assumption of a homogeneous half-space of resistivity 12.5 ohm metres. This entails two corrections, called here the azi-muthal correction and the propagation correction. Field strength residuals are similarly defined by subtracting a normalised theoretical field, again assuming a homogeneous half space.

Results for all three dipole sites give large phase residuals (30-80°) and small field strength residuals (5%). Anomalies most closely associated with the target occur with the dipole transmitter positioned on the long (N-S) axis.

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1980-12-01

2026-01-19

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References

ANDERSON, W. L., 1974. Electromagnetic fields about a finite electric wire source. U.S. Dept. of Commerce, National Technical Information Service PB-238 199.
DAVIS, L., 1978. Deep weathering, Cobar –; lecture notes from the U.S.–Australia electromagnetic workshop Ed. B. Brabham, Bull. Aust. Soc. Explor. Geophys.,9, 2-3.
HALL, S. H., DAVIS, J., 1977. The rotating current dipole - a field test. Geoph. Prosp.25, 308-320.
HALL, S. H–; DAVIS, J., FURNESS, C. P., 1977. A high precision audio-frequency phase and ratio nullmeter. Pap. Dep. Geol. Univ. Qld.8,(1),15-23.
HALL, S. H., KELLY, M. J., DAVIS, J., 1978. Modelling the rotating current dipole method of E.M. prospecting. Bull. Aust. Soc. Explor. Geophys.,9, 55-61.
HALL, S. H., KELLY, M. J., DAVIS, J., 1977. The rotating dipole method of prospecting – model studies. Australian Mineral Industries Research Association. 71-P59.
HILL, D. A., WAIT, J. R., 1973. Subsurface electromagnetic fields of a grounded cable of finite length. Can Jour. Physics,51, 1534-50.
MORRISON, H. F., PHILLIPS, R. J., O'BRIEN, D. P., 1969. Quantitative interpretation of transient electromagnetic fields over a layered half-space. Geophy. Prosp.17, 82-101.
WAIT, J. R., 1961. The electromagnetic fields of a horizontal dipole in the presence of a conducting half-space. Can Jour. Physics,39, 1017-28.

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Article Type: Research Article

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A rotating dipole survey of the Elura prospect, Cobar, NSW

Abstract

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