Characteristics of magnetic sources and guidelines for exploration in the Cobar area N.S.W.

P.G. Willkes

doi:10.1071/EG979034

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

Characteristics of magnetic sources and guidelines for exploration in the Cobar area N.S.W.
Authors P.G. Willkes^a
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^a Bureau of Mineral Resources, Geology and Geophysics, .
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 10, Issue 1, Mar 1979, p. 34 - 41
DOI: https://doi.org/10.1071/EG979034
- Published online: 01 Mar 1979

Abstract

Many of the ore deposits in the Cobar area contain sufficient pyrrhotite and/or magnetite to form suitable targets for magnetic exploration methods. Hence,, aeromagnetic survey, supported by ground magnetics is a primary method of exploration in this area. However, widespread occurrences of magnetic material (maghemite and other lateritic minerals) at or near the surface commonly produce a magnetic noise which may mask the response of bedrock sources, or produce anomalies which are hard to distinguish from those due to bedrock sources.

The characteristics of magnetic orebodies, and surface or near-surface occurrences of maghemite, have been studied by field surveys and laboratory measurements on rock samples. Modelling, data processing, and signal enhancement have been used to study the use of magnetic methods for exploration in the Cobar area. These studies show that the use of magnetics for exploration in the Cobar area requires very careful attention to survey specification, data processing, and interpretation of results, to ensure reasonable effectiveness throughout much of the area

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1979-03-01

2026-01-12

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References

BAKER, C.J., SCHMIDT, B.L., and SHERWIN, L. 1975 Revised stratigraphy of the Cobar-Gunderbooka area. Quarterly Notes (No. 20) of the Geological Survey of NSW, July 1975.
BROOKE, W.J.L., 1975. Cobar mining field in KNIGHT, C.L. (editor). Economic Geology of Australia and Papua New Guinea Vol. 1. A.I.M.M. Monograph 5, pp 683-694
HOLLOWAY, J.L., 1958. Smoothing and filtering of time series and space fields. Advances in Geophysics, Volume 4, pp 351-389. Academic Press Inc.
MARKHAM, N.L,, 1975. The Tasman geosyncline in NSW – mineralisation, in KNIGHT, C.L. (editor). Economic Geology of Australia and Papua New Guinea A.I.M.M. Monograph 5, Vol. 1. pp 676-683
NAGATA, T., 1961. Rock magnetism. Maruzen Company Ltd., Tokyo.
RUSSELL, R.T., and LEWIS, B.R., 1965. Gold and copper deposits of the Cobar district, in Geology of Australian ore deposits. Eighth Commonwealth Mining and Metallurgical Congress. Australia and New Zealand, 1965. Publications Vol. 1, 411-419
SUPPEL.D.W., and STEVENS, B.P.J., 1973. Geology and mineralisation at the Tharsis mine, with a general review of the Cobar field. Records of the Geological Survey of New South Wales, Vol. 15, part 2, 1973.
THOMPSON, B.P., 1953. Geology and ore occurrence in the Cobar district, in Geology of Australian ore deposits. Fifth Empire Mining and Metallurgical Congress. Australia and New Zealand. Publications Vol. 1, 863-896
WARD, S.H., 1965. Detection of magnetic ores beneath volcanic flows. Short course and symposium on computers and computer applications in mining and exploration, held Tucson Arizona 1965. Vol. 3 published by College of Mines, the University of Arizona.

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Article Type: Research Article

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Characteristics of magnetic sources and guidelines for exploration in the Cobar area N.S.W.

Abstract

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