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Exploration and Mining Geology; January-April 2007; v. 16; no. 1-2; p. 67-81; DOI: 10.2113/gsemg.16.1-2.67
© 2007 Canadian Institute of Mining, Metallurgy & Petroleum
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Geophysical Case Study of the Gallen Deposit, Québec, Canada

L.Z. Cheng1,{dagger}, R.S. Smith2, M. Allard3, M. Chouteau4, P. Keating5, J. Lemieux2, M.A. Vallée6, D. Bois1 and D .K. Fountain2

1 Université du Québec en Abitibi-Témiscamingue, 445 boul. de l’Université, Rouyn-Noranda, Québec, J9X 5E4.
2 Fugro Airborne Surveys, 2060 Walkley Road, Ottawa, Ontario, K1G 3P5.
3 Noranda Inc, Division de l’Exploration, 3296, avenue Francis Hughes, Laval, Québec, H7L 5A7.
4 École Polytechnique de Montréal, Département des Génies civil, géologique et des mines C.P. 6079 Succursale Centre-Ville, Montréal, Québec, H3C 3A7.
5 Geological Survey of Canada, Natural Resources Canada, 615 Booth Street, Ottawa, Ontario, K1A 0E9.
6 Fugro Airborne Surveys, 5610, Chemin Bois-Franc, St-Laurent, Montréal, Québec, H4S 1A9.

Correspondence: {dagger} Corresponding Author: E-mail: li_zhen.cheng{at}uqat.ca

As part of a larger research program, a number of MEGATEM airborne electromagnetic (EM) test flights were flown over the Gallen massive sulfide deposit in northwest Québec. A particularity of this test site is that a major part of the ore body was extracted before the MEGATEM survey. Therefore one of the purposes of this study was to verify the ability of the system to detect the remaining massive sulfides below the water in the open pit. The open pit is also surrounded by a metallic fence, and a power line is present in the vicinity. A large part of the case study involved accounting for the impact of infrastructure and acidic water on the survey, which will help in the interpretation of airborne EM responses in complex exploration situations.

The Gallen deposit was also previously flown with the INPUT and GEOTEM airborne EM systems before the major exploitation period. A comparison between the results from the different survey results allows estimation of the physical properties of the Gallen deposit, which is a relatively poor conductor.

A new method for removing the power line signal shows amplitudes with a smaller residual associated with the emanating fields, and more compact, cleaner responses associated with induced currents. This will make it easier to identify bedrock conductors close to power lines.

Key Words: Gallen • massive sulfide deposit • Québec • airborne electromagnetic survey






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