Exploration Significance of Gravity Surveys, Rosebery Mine, Tasmania

L. E. Leaman

doi:10.1071/EG991231

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

Exploration Significance of Gravity Surveys, Rosebery Mine, Tasmania
Authors L. E. Leaman^a
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^a Leaman Geophysics, G.P.O. Box 320D Hobart, , Tas, . 7001
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 22, Issue 1, Mar 1991, p. 231 - 234
DOI: https://doi.org/10.1071/EG991231
- Published online: 01 Mar 1991

Abstract

Gravity surveys of semi-regional specification around, and within, Rosebery Mine in the Mt Read Volcanics of western Tasmania have demonstrated that shallowly dipping base metal ore systems may generate significant perturbations in the gravity field. The effect reflects the entire ore-gangue-alteration association and not simply the proportion of ore of economic grade or density.

High relief terrain, complex near surface geology and concealed granite stock do not obscure the correlation with mineralisation. Analysis shows that much of the mine lies within the metamorphic aureole of the granite and the confusing mix of isotope and mineral indicators is fully explained.

Comparative analysis of the observed field and that calculated from the rock and density distribution in the mine area has revealed several local anomalous masses. The largest of these, offset from a large barren volume in the mine, has now been shown to be due to a large, previously unsuspected and detached volume of mineralised host sequence.

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2026-01-19

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References

Burton, C. C. J., (1975). ‘Rosebery Zinc-Lead-Copper Orebody’. In: Vol I. Metals. Economic Geology of Australia and Papua New Guinea. Aus. I. M. M., 619-626.
Green, G. R., (1990). ‘Rock alteration, mineral and oxygen isotope zonation in the Rosebery District, Tasmania’. Abstract, 10 th Australian Geological Convention, Hobart, p. 15.
Hudspeth, J. W., (1986). ‘A gravity survey of the Hellyer Deposit.’ Abstract, Mount Read Volcanics and associated ore deposits, A Symposium, Geological Society of Australia, Bumie.
Leaman, D. E., (1987). ‘Mineralisation signature study: Geophysics, Gravity and Magnetics’. Mount Read Volcanics Project Report, Dep. Mines Tasm.
Leaman, D. E., & Richardson, R. G., (1981). ‘Gravity survey of the Que River Deposit, western Tasmania. Unpub. Rept. Dep. Mines Tasm., 1981/24.
Leaman, D. E., & Richardson, R. G., (1989a). ‘The granites of west and north-west Tasmania - a geophysical interpretation’. Bull. geol. Surv. Tasm., 66.
Leaman, D. E., & Richardson, R. G., (1989b). ‘Production of a residual gravity field map for Tasmania and some implications’. Explor. Geophys., 20, 181-184.
Talwani, M., & Ewing, M., (1960). ‘Rapid computation of gravitational attraction of three dimensional bodies of arbitrary shape’. Geophysics. 25, 203-225.

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Article Type: Research Article

Keyword(s): exploration; gravity; interpretation; Rosebery

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Exploration Significance of Gravity Surveys, Rosebery Mine, Tasmania

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