Mainly Magnetics: Mathinna Beds and Gold Mineralisation in NE Tasmania

D.E. Leaman

doi:10.1071/EG992185

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

Mainly Magnetics: Mathinna Beds and Gold Mineralisation in NE Tasmania
Authors D.E. Leaman^a
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^a Leaman Geophysics, GPO Box 320D, Hobart, Tasmania, 7001
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 23, Issue 1-2, Mar 1992, p. 185 - 189
DOI: https://doi.org/10.1071/EG992185
- Published online: 01 Mar 1992

Abstract

Gold-bearing quartz reef systems within the Lower Palaeozoic Mathinna Beds metasediments of NE Tasmania have been mapped magnetically even though magnetic contrasts are small. High-resolution airborne surveys have resolved differences between the granitoids which intrude the host sequence, and an array of structures within the host rocks. All known mineralized areas studied appear to be associated with one member of the granodiorite family, and with particular structural orientations. Detailed ground surveys can define the volume of altered or potentially mineralized host rocks, and relate local vein orientations to the more regional controls. Vein systems are themselves mappable magnetically owing to oxidation along the vein walls, which produce spike responses.

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1992-03-01

2026-01-19

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References

Bendall, M. R., Volkman, J. K., Leaman, D. E., and Burrett, C. F. (1991). ‘Recent Developments in exploration for oil in Tasmania’. APEA J.31, 74–84.
Leaman, D. E. (1974). ‘Geophysics of the Lefroy Goldfield’. Tech. Rep. Dep. Mines Tasm., 17, 79–88.
Leaman, D. E., (1987a). ‘Report on trial survey, Portland Mine’. Report for Placeco Australia by Leaman Geophysics. Dep. Mines Tasm. open file.
Leaman, D. E. (1987b). ‘Acquisition report, airborne geophysical surveys, EL 34/86, Gladstone’. Report for Placeco Australia by Leaman Geophysics. Dep. Mines Tasm. open file.
Leaman, D. E. (1989). ‘Ground magnetic survey, EL 55/83. Mangana’. Report for Pegasus Gold by Leaman Geophysics. Dep. Mines Tasm. open file.
Leaman, D. E., Symonds, P. A., and Shirley, J. E. (1973). ‘Gravity survey of the Tamar Region, northern Tasmania’. Paper Geol. Surv. Tasm.1.
Richardson, R. G. (1989). ‘The Mangana-Alberton aeromagnetic survey — a preliminary interpretation’. Rep. Dep. Mines Tasm. 1989/19 (unpubl.).
Wellman, P. (1988). ‘Aspects of interpretation of aeromagnetic surveys’. In Burrett, C. F., and Martin, E. L. (eds), Geology and Mineral Resources of Tasmania. Geol. Soc. Aust. Spec. Pub.15, 459–461.

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Article Type: Research Article

Keyword(s): gold; granodiorites; Magnetics; Mathinna Beds; North east Tasmania; quartz veins

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Mainly Magnetics: Mathinna Beds and Gold Mineralisation in NE Tasmania

Abstract

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