A New Survey Design for 3D IP Inversion Modelling at Copper Hill

R.M.S. White; S. Collins; R. Denne; R. Hee; P. Brown

doi:10.1071/EG01152

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

A New Survey Design for 3D IP Inversion Modelling at Copper Hill
Authors R.M.S. White^a, S. Collins^b, R. Denne^c, R. Hee^c and P. Brown^d
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^a Tooronga Resources Pty Ltd., 207 Tooronga Road Terrey Hills, , NSW, . 2084, [email protected] ^b Arctan Services Pty. Ltd., 9 Marshall Avenue Warrawee, NSW, 2074, [email protected] ^c Golden Cross Operations Pty. Ltd., 1st flr, 22 Edgeworth David Ave Hornsby, , NSW, , 2077, [email protected] ^d Scintrex Pty. Ltd., 20 Century Road Malaga, , WA, , 6090, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 32, Issue 3-4, Sep 2001, p. 152 - 155
DOI: https://doi.org/10.1071/EG01152
- Published online: 01 Sep 2001

Abstract

The Copper Hill prospect in NSW is a porphyry copper/gold system. Geochemical and gradient array IP results suggest that grid northwest and grid northeast structural directions control the location of mineralisation. Previous drilling has been oblique to these directions.

The known sulphide rich mineralised zones exhibit moderate to strong IP responses. An IP/resistivity survey was conducted to produce a detailed 3D mineralisation model for Copper Hill. 3D inversion of IP data is considered suitable for mapping the sulphide horizons in detail.

The use of 3D-inversion modeling techniques, accepting a modified pole-dipole IP survey array, allowed an electrode array to be designed for fast acquisition of a large quantity of data.

The use of modified pole-dipole arrays extend the effective depth of investigation of IP surveys as well as improving the across line resolution.

Inversion results delineated the three dimensional foim of sulphides zones at Copper Hill.

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References

Chivas, A.R and Nutter, A. H., 1975, Copper Hill Porphry-Copper Prospect. Knight, S.L. (ed), Economic Geology of Australia and Papua New Guinea vol I. Metals: Australasian Institute of Mining and Metallurgy Monograph No. 5, p 716-720.
Erceg, M., 1992, Exploration Licence 2290 - Copper Hill, Molong, NSW.: Annual Report to November 13, 1992 - Submitted as part of Special Circumstances Renewal. Cyprus Gold Australia Limited. Unpublished.
Haywood, S., 1996, Exploration Licence 2290 - Copper Hill, Molong, NSW.: Annual Report to November 17, 1995 - November 13, 1996. Newcrest Mining Limited. Unpublished.
Logan, R.G., 1993, Exploration Licence 2290 - Copper Hill, Molong, NSW.: Annual Report to November 13, 1993. MIM Exploration Pty Ltd. Unpublished.
Loke, M.H. and Baker R.D., 1996a. Rapid least-squares inversion of apparent resistivity pseudosections using a quasi-Newton method. Geophysical Prospecting, 44, 131-152.
Loke, M.H. and Baker R.D., 1996b. Practical Techniques for 3D resistivity surveys and data inversion. Geophysical Prospecting, 44, 499-523.
Loke M.H., 2001, RES3DINV - Rapid 3D Resistivity and IP Inversion using the least squares method. Geoelectrical Imaging 2D & 3D. : Computer software manual. Geotomo Software, Malaysia.
Morrison, G.W., 1998, Copper Hill: Magmatic - Hydrothermal Evolution: Magmatic and Hydrothermal
Evolution of Intrusive Related gold Deposits. AMIRA P245 Final Report. Section 15A.

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Article Type: Research Article

Keyword(s): 3D inversion; Arrays; Copper Hill; IP; Resistivity

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A New Survey Design for 3D IP Inversion Modelling at Copper Hill

Abstract

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