Magnetotelluric and teleseismic experiments as part of the
Walmsley Lake project: Experimental designs and preliminary results

Alan G. Jones, David Snyder and Jessica Spratt
Continental Geoscience Division,
Geological Survey of Canada,
615 Booth St., Ottawa, Ontario, K1A 0E9

The southeastern part of the Slave craton offers high potential
for diamonds as well as possibly for base and precious metals.
However, this region is poorly known geologically and geophysically
compared to other parts of the craton. The Walmsley Lake project
addresses this deficiency with acquisition of collocated bedrock, isotope
and geophysical data. This paper describes the initiation of the geophysical
component of the project, which comprises magnetotelluric and teleseismic
observations, and presents the preliminary qualitative results of the
data from the magnetotelluric component.

The main preliminary qualitative result is the discovery of a large conductivity
anomaly within the Thelon-Talston Magmatic Zone comparable in scale to the
North American Central Plains (NACP) conductivity anomaly. This contrasts
sharply with the lack of a significant conductor in the Wopmay orogen.