Constrained Magnetic Modelling of the Wallaby Gold Deposit, Western Australia

Sasha Banaszczyk; Mike Dentith; Yvonne Wallace

doi:10.1071/ASEG2015ab290

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa Constrained Magnetic Modelling of the Wallaby Gold Deposit, Western Australia
Authors Sasha Banaszczyk^a, Mike Dentith^b and Yvonne Wallace^c,d
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^a Centre for Exploration Targeting (CET) School of Earth and EnvironmentThe University of Western Australia, 35 Stirling Hwy, Crawley, , WA, 6009, [email protected] ^b Centre for Exploration Targeting (CET) School of Earth and EnvironmentThe University of Western Australia, 35 Stirling Hwy, Crawley, , WA, 6009, [email protected] ^c Barrick (Australia Pacific) Level 2, 2 Mill St, Perth, WA, 6000, [email protected] ^d Southern Geoscience Consultants Pty Ltd, 183 Great Eastern Hwy, Belmont, , WA, 6104, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab290
- Published online: 01 Dec 2015

Abstract

The Wallaby Gold deposit is located 25km southwest of Laverton within the Eastern Goldfields Province of Western Australia. Gold mineralisation is hosted within a mafic conglomerate, intruded by a south-plunging magnetite-actinolite-epidote-calcite altered syenite pipe. Regions of low susceptibility within the pipe are associated with gold mineralisation.

Airborne magnetic data from the Wallaby Gold deposit was inverted using the University of British Colombia Geophysical Inversion Facility MAGINV3D code to produce a 3D model of the subsurface magnetic susceptibility.

Magnetic susceptibility measurements acquired at 1m intervals on diamond drill core were used to constrain the results of the inversion. This was facilitated using the Sparse Constraint Model Builder, which creates a physical property model based on existing geological, geophysical or geochemical measurements to then be applied within the UBC-GIF inversion code.

The constrained inversion defined regions of low magnetic susceptibility within the outer high magnetic susceptible zones of the alteration pipe and potential mine-scale structural features can be interpreted. This is useful information given the structural control on gold mineralisation at Wallaby and its association with regions of reduced magnetic susceptibility.

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References

Banaszczyk, S., 2011, The Constrained Magnetic Modelling of the Wallaby Gold Deposit, Western Australia. Honours thesis, The University of Western Australia. (unpubl.)
Coggon, J., 2003, Magnetism - Key to the Wallaby Gold Deposit. Exploration Geophysics, 34, 125-30.
Coggon, J., 2000, Placer (Granny Smith) Pty Ltd. Magnetic Character of the Wallaby Gold Deposit. Mines Geophysical Services, 1-11.
Li, Y. and Oldenburg, D.W., 1996, 3-D Inversion of Magnetic Data. Geophysics 61, 394-408.
Miller, J., 2011, Controversial Archean Ore Bodies (Pluton-Associated Versus Orogenic?) & Ore Shoot Controls -Wallaby Case Study. Centre for Exploration Targeting.
Miller, J.M., 2010, Central Laverton Synthesis-5ias-Field Guide. Chapter 2, The University of Western Australia, Centre for Exploration Targeting, 1-28.
Miller, J., 2005, The Structural Evolution of the Wallaby Gold Deposit, Laverton, W.A. Project Y4, Predictive Mineral Discovery Cooperative Research Centre, 1-80.
Mueller, A.G., Hall, G.C., Nemchin, A.A., Stein, H.J., Creaser, R.A., and Mason, D.R., 2008, Archean High-Mg Monzodiorite-Syenite, Epidote Skarn, and Biotite-Sericite Gold Lodes in the Granny Smith-Wallaby District, Australia: U-Pb and Re-Os Chronometry of Two Intrusion-Related Hydrothermal Systems. Mineralium Deposita, 43, 337-62.
Neilson, I., 2005, Magnetic Susceptibility and Upside Potential Study of the Wallaby Deposit, Confidential Report for Placer Granny Smith, Laverton WA., Mira Geoscience Ltd., 1-34.
Salier, B.P., Groves, D.I., McNaughton, N.J., and Fletcher, I.R., 2004, The World-Class Wallaby Gold Deposit, Laverton, Western Australia: An Orogenic-Style Overprint on a Magmatic-Hydrothermal Magnetite-Calcite Alteration Pipe? Mineralium Deposita, 39, 473-94.
Williams, N.C., 2008, Geologically-Constrained UBC-GIF Gravity and Magnetic Inversions with Examples from the Agnew-Wiluna Greenstone Belt, Western Australia. Ph.D Thesis, The University of British Columbia. (unpubl.)

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Article Type: Research Article

Keyword(s): constrained 3D Inversion; magnetic susceptibility; Wallaby gold deposit

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