The Cawse Nickeliferous Laterite Deposits, Western Australia – A Case Study on the Application of Airborne Geophysics in Targeting Zones of Supergene Enrichment in A Complex Regolith Setting.

Tim Munday; Andy Green; Jayson Meyers; Jim Macnae; Jasmine Rutherford; Mat Cooper

doi:10.1071/ASEG2003ab113

ISSN: 2202-0586
E-ISSN:

oa The Cawse Nickeliferous Laterite Deposits, Western Australia – A Case Study on the Application of Airborne Geophysics in Targeting Zones of Supergene Enrichment in A Complex Regolith Setting.
Authors Tim Munday^a, Andy Green^b, Jayson Meyers^c, Jim Macnae^d, Jasmine Rutherford^e and Mat Cooper^f
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^a CRCLEME/CSIROEM, , Australia, [email protected] ^b OTBC, , Australia, [email protected] ^c Curtin University, , Australia, [email protected] ^d RMIT, , Australia, [email protected] ^e UWA, , Australia, [email protected] ^f Reosurce Potentials Pty,, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2003, Issue ASEG2003 - 16th Geophysical Conference, Aug 2003, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2003ab113
- Published online: 01 Aug 2003

Abstract

Helicopter electromagnetic (HEM) and magnetic survey data were acquired over the Cawse district in the Eastern Goldfields of Western Australia, to help define the structural controls that influence supergene mineralisation and delineate areas favorable for further exploration. The rationale for conducting the EM survey was that previous work in the area had demonstrated that local discontinuities, represented by stratigraphic and structural variations in the regolith, or related textural and/or mineralogical changes have influenced hydrogeological process and consequently the distribution mobile elements such as Ni, Co and Mn within the profile.

The observed conductivity structure in the HEM data is related to regolith heterogeneity and to the presence of hydromorphic barriers (structural, material) behind which salts and water accumulate. In places these barriers are spatially associated with Ni enrichment.

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References

Brand, N.W., Butt, C.R.M., and Hellsten, K.J., 1996, Structural and lithological controls in the formation of the Cawse nickel laterite deposits, Western Australia– Implications for supergene ore formation and exploration in deeply weathered terrains. Nickel '96. Conference Proc. Kalgoorlie, Nov. 1996, Aus BVIM, Pub.No. 6/96, 185-190.
Brand, N.W., Butt, C.R.M., and Elias, M., 1998, Nickel laterites: classification and features. AGSO Journal of Australian Geology and Geophysics, 17(4), 81-88.
Macnae, J.C., King, A., Stolz, N., Osmakoff, A., Blaha, A., 1998, Fast AEM data processing and inversion: Exploration Geophysics, 29, 163-169.
Munday, T.J., Macnae, J., Bishop, J., and Sattel, D., 2001, A geological interpretation of observed electrical structures in the regolith: Lawlers, Western Australia. Exploration Geophysics, 32, 36-47.
Rutherford, J., Munday, T., Meyers, J., and Cooper, M., 2001, Relationship between regolith materials, petrophysical properties, hydrogeology and mineralisation at the Cawse Ni lateritedeposits, Western Australia: Implications for exploring with airborne EM: Exploration Geophysics, 32, 160-170.

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Article Type: Research Article

Keyword(s): Cawse deposit; Helicopter electromagnetics; regolith; supergene Ni

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