Drillhole Electromagnetic Surveying in the Mine Environment

G. N. Fallon; P. Andrews; J. K. Jackson; S. B. Bartrop

doi:10.1071/EG996067

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

Drillhole Electromagnetic Surveying in the Mine Environment
Authors G. N. Fallon^a, P. Andrews^a, J. K. Jackson^a and S. B. Bartrop^b
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^a M.I.M. Exploration Pty Ltd, , 2/55 Little Edward Street. Spring Hill, Queensland, 4000, . ^b MIM Isamine - Mount Isa Mine., Mount Isa. Queensland, 4825, .
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 27, Issue 2-3, Jun 1996, p. 67 - 75
DOI: https://doi.org/10.1071/EG996067
- Published online: 01 Jun 1996

Abstract

An efficient and effective exploration strategy for further - resources is important for large scale mining operations such as Mi Isa where the depth and scope of the operations means that a proportionately larger volume of highly prospective rock is available for exploration.The application of drillhole electromagnetics (DHEM) allows the effective radius of exploration from a single drillhole to be significantly increased, thus decreasing the cost of discovery.

Typically this type of near- and in-mine exploration will utilise directional drilling technology from the surface or underground. Such holes commonly have sections with inclinations too shallow for conventional DHEM, which relies on gravity to move the probe.

This paper describes trials undertaken by MIM Isamine which were designed to overcome the problem of surveying shallow dipping to upwardly inclined drillholes. Various logistical, operational and safety aspects are also addressed which cumulatively produce a working system and help minimise noise.

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References

Blake, D.H., 1987. Geology of the Mount Isa Inlier and environs. Queensland and Northern Territory. Bureau of Mineral Resources Ausl. Bull 225.
Doe, A.R.D., Carswell, J.T.. Smith. C.K. and Erickson, M.E., 1990. Underground Downhole Geophysics at CSA Mine. CoDar Mine Geologists Conference. Australasian Institute of Mining and MetaBurgy. Mt Isa. ppg-13.
Eadio. E.T. and Staftari. G-, 1987, Introduction to Downhole Electromagnetic Methods. Explorabon Geopnys.es. 18. 247-354.
Falton. G.N. and Busuttil, S , 1992, An appraisal of the geophysical OttectS of the Mount Isa ore bodies. Exploration Geophysics. 23. 133-140.
Forrestal, RJ., 1990. Mount Isa and Hilton silver-iead-zinc deposits. 927-934. In F.E. HUGHES (ed). Geology of the mineral deposits of Australia and Papua New Guinea. Australian Institute ot Mining and Metallurgy, Melbourne.
Longyear (Australia). 1993, BQ Core Barrel Assembly, unpublished pnce list.
M.I.M. (1993). MIM Holdings Ltd Report to Shareholders.
Perkins, W.G.. 1984. Mount Isa silica-dolomite and copper orebodies: the result of a syntectonk; hydrotheimal alteration system. Economic Geology. 79, 601-637.
Richards. D.J.. 1967. CRAE’s Approach to Downhole TEM at Broken Hill. Exploration Geophysics. 18, 279-294.
Rubin, L.A., 1967. Wireless communications in borehole geophysics, a state-of-the-art report. Proceedings of the Second International Symposium on Borehole Geophysics for Minerals. Geotechnical and Groundwater Applications, Golden. Colorado. 241-247.
Sims. D.A and Bartrop, SB., 1993. Exploration in a Mature Mine - The Mount isa Mine Strategy. International Mining Geology Conference, Australian Institute of Mining and Metallurgy. Kalgooriie. pp25-29.
Weast. R.C. (ed). 1983. CRC Handbook of Chemistry and Physics 63rd EdrtJon
Wlttrisch. C, 1991, The Downhole Electric Connecior Breaks NEW Ground. The Log Analyst, Jan-Feb. P43.

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Article Type: Research Article

Keyword(s): copper; DHEM; mine; Ml Isa

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Drillhole Electromagnetic Surveying in the Mine Environment

Abstract

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