Geophysical Case Study of the Iso and New Insco Deposits, Quebec, Canada, Part II: Modeling and Interpretation

Abstract

2 The MEGATEMII data collected over the Iso and New Insco bodies have been modelled 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 the copper-rich zones and the next most conductive to the pyrite-rich zone. The EMIGMA package was also used to show that a thick-prism model might be a more appropriate model for the New Insco ore body. Gravity modeling constrained by the known geology was successful in identifying the denser sulphide zones. The densest zones appear to be pyrite rich. Magnetic modeling identified diabase dykes. Over New Insco, a small magnetic anomaly was attributed to