Mineral exploration in the St Ives area, Eastern Goldfields, using geophysical and hyperspectral data

Ruth Murdie; Thomas Cudahy; Carsten Laukamp

doi:10.1081/22020586.2010.12041954

ISSN: 2202-0586
E-ISSN:

oa Mineral exploration in the St Ives area, Eastern Goldfields, using geophysical and hyperspectral data
Authors Ruth Murdie^a, Thomas Cudahy^b and Carsten Laukamp^c
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^a St Ives Gold Mine, Kambalda WA, Australia, 6442, [email protected] ^b CSIRO Earth Science and Resource EngineeringARRC, , Kensington WA, Australia, 6151, [email protected] ^c CSIRO Earth Science and Resource EngineeringARRC, , Kensington WA, Australia, 6151, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 4
DOI: https://doi.org/10.1081/22020586.2010.12041954
- Published online: 01 Dec 2010

Abstract

Summary

Recognising the imprint of invading fluids on primary geology using geophysical and hyperspectral airborne imagery can help locating sites where there may have existed suitable physicochemical contrasts able to precipitate Au. This is tested in the St Ives area of Western Australia, for regionally metamorphosed ultramafic rocks. Airborne magnetic TMI data are used to map areas enriched in magnetite, which could have developed after serpentinisation (hydration reactions). However, magnetic susceptibility often changes along strike of mapped ultramafic units. The hyperspectral data provide mineralogical links between this geophysical response and the mapped geology. That is, areas of higher magnetic response are often associated with relatively ferrous-poor silicate Mg-OH-bearing minerals. The ultramafic units are characterised by high contents of talcamphibole. Cross-cutting zones of potential Kmetasomatism can be assessed using the hyperspectral chlorite (and biotite) information and gamma radiometrics.

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2026-01-13

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References

Clark, M.E., Carmichael, D.M., Hodgson, C.J., and Fu, M., 1989, Wall rocks alteration, Victory Gold Mine, Kambalda, Western Australia, Processes and P-T-XCO2 conditions of metasomatism: In The Geology of Gold Deposits : The Perspectives in 1988, edited by Keays, R.R., Ramsay, W.R.H. and Groves, D.I. Economic Geology, v. 76, p. 445-459.
Cudahy, T.J, Caccetta, M., Cornelius, A., Hewson, R.D., Wells, M., Skwarnecki, M., Halley, S., Hausknecht, P., Mason, P. and Quigley, M., 2005. Regolith geology and alteration mineral maps from new generation airborne and satellite remote sensing technologies; and Explanatory Notes for the Kalgoorlie-Kanowna 1:100,000 scale map sheet, remote sensing mineral maps. MERIWA Report No. 252, 1-114.
Cudahy, T.J., Hewson, R.D., Barnes, S.J., and Groenwalde, B., 2006. Mapping non-magnetic talc-bearing ultramafic rocks in the Kalgoorlie region using airborne hyperspectral data. ASEG Extended Abstracts 2006, 3 pages.
Cudahy, T., Jones, M., Thomas, M., et al. 2008. Next Generation Mineral Mapping: Queensland airborne HyMap and satellite ASTER surveys 2006-2008. CSIRO report P2007/364.
McLeod, R.L., Gabell, A.R., Green, A.A., and Gardavsky, V., 1987, Chlorite infrared spectral data as proximity indicators of volcanogenic massive sulphide mineralisation: Pacific Rim Congress ’87, Gold Coast, Queensland, August 26–29, 1987, Proceedings, p. 321–324.
Neumayr, P., Walshe, J., Connors, K., Cox, S., Morrison, R.S., and Stolz, E., 2004, Gold mineralization in the St Ives camp near Kambalda: Western Australia Geological Survey, Record 2004/16, p. 23-47.

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Article Type: Research Article

Keyword(s): Archaean Au; hydrothermal alteration.; hyperspectral imagery; TM; ultramafic rock

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oa Mineral exploration in the St Ives area, Eastern Goldfields, using geophysical and hyperspectral data

Abstract

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