Geophysics and the discovery of the Cadia gold-copper system

Campbell Mackey; John Holliday; David Close; John Bishop

doi:10.1071/ASEG2001ab082

ISSN: 2202-0586
E-ISSN:

oa Geophysics and the discovery of the Cadia gold-copper system
Authors Campbell Mackey^a, John Holliday^b, David Close^c and John Bishop^d
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^a Newcrest Mining Ltd, Australia, [email protected] ^b Newcrest Mining Ltd, Australia, [email protected] ^c University of Tasmania, [email protected] ^d Mitre Geophysics, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2001ab082
- Published online: 01 Dec 2001

Abstract

The Cadia Gold Copper system in Central West NSW is a world-class porphyry gold copper system, where geophysics has helped to discover or define some of the resources.

Initial drilling at Cadia Hill employed ground magnetic data to help optimise drillhole direction.

A ground magnetic target was drilled at Cadia East, and showed increasing copper grades with depth. Follow up drilling discovered the Cadia East mineralisation under Silurian sedimentary cover.

Ground magnetic and 200m dipole-dipole IP data led indirectly to the discovery of the Ridgeway mineralisation under Tertiary basalt cover, by detecting the magnetite and pyrite halo above the mineralisation. The IP drillhole intersected anomalous gold and copper. Deeper follow up drilling intersected the Ridgeway orebody.

Other data acquired across Cadia include heli-magnetics / radiometrics, gravity, downhole EM at Ridgeway, and physical property measurements.

Overall, magnetics and IP have been the most successful methods used to date.

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2001-12-01

2026-01-23

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References

Close, D., 2000, A geophysical study of the Ridgeway Gold - Copper Deposit NSW, Honours Thesis, School of Earth Sciences, University of Tasmania.
Wood, D., & Holliday, J., Discovery of the Cadia Gold/Copper Deposit in New South Wales, New Generation Gold Mines: Case Histories of Discovery, Conference Proceedings 1995, Australian Mineral Foundation

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Article Type: Research Article

Keyword(s): Cadia; copper; gold; IP; magnetics

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