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Exploration and Mining Geology; January 2006; v. 15; no. 1-2; p. 65-74; DOI: 10.2113/gsemg.15.1-2.65
© 2006 Canadian Institute of Mining, Metallurgy & Petroleum
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Geophysical Case Study of the Iso and New Insco Deposits, Québec, Canada, Part II: Modeling and Interpretation

L.Z. CHENG1, R.S. SMITH2, M. ALLARD3, P. KEATING4, M. CHOUTEAU5, J. LEMIEUX2, M.A. VALLÉE6, D. BOIS1 and D.K. FOUNTAIN2

1 Université du Québec en Abitibi-Témiscamingue, 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 Geological Survey of Canada, Natural Resources Canada, 615 Booth Street, Ottawa, ON K1A 0E9.
5 École Polytechnique de Montréal, Départment des Génies Civil, Géologique et des Mines, Montréal, Québec H3C 3A7.
6 Fugro Airborne Surveys, 5610 Chemin Bois-Franc, St. Laurent, Montréal, Québec H4S 1A9.

MEGATEMII airborne electromagnetic data collected over the Iso and New Insco massive sulfide deposits have been modeled using three modeling packages. The EMQ package is a quick inversion tool which indicates that the Iso body is a dipping, plate-like body. The New Insco body is inferred to have a geometry somewhere between a dipping plate and a sphere. The Maxwell package was used to refine the properties of the plate-like body at Iso. The EMIGMA package was able to identify which parts of the New Insco orebody were more conductive. It was observed that the most conductive parts correspond to copper-rich zones and the next most conductive to pyrite-rich zones. The EMIGMA package was also used to show that a thick-prism model might be more appropriate for the New Insco orebody.

Gravity modeling constrained by the known geology was successful in identifying the denser sulfide zones. The densest zones appear to be pyrite rich. Magnetic modeling identified diabase dikes. Over New Insco, a small magnetic anomaly was attributed to pyrrhotite-rich sulfides. There was only a weak magnetic anomaly over the Iso body, consistent with the nonmagnetic sulfides logged in the holes drilled at that location.

Key Words: Geophysics • Airborne Electromagnetic survey • Iso • New Insco • Volcanogenic massive sulfide deposit • Rouyn-Noranda mining camp • Modeling






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