Abstract

This report presents the field database and analytical results from the 2012 till sampling campaign of the GEM Geo-mapping Frontiers' Tehery-Cape Dobbs project. Pebble lithologies, dominated by felsic to intermediate intrusive rocks with minor metavolcanic and metasedimentary rocks, indicate short glacial transport distances and local provenance, likely linked to proximity to the Keewatin Ice Divide during the last glaciation. Forsteritic olivine grains, locally coincident with mantle-derived indicator minerals (chromite, Cr-diospide, Cr-pyrope), are most abundant south of the kimberlite field discovered by Peregrine Diamonds Ltd. and form a possible fan-shaped dispersal pattern that extends 80 km, parallel to a strong southeast ice-flow recorded south of the Keewatin Ice Divide. Potential sources for the olivine grains include olivine-rich crustal rocks or multiple kimberlite bodies. A supracrustal belt in the central portion of the map area shows the greatest potential for base and precious metal mineralization as highlighted by anomalous values in Ag, Cu, Bi, Au, and other metals in till samples collected near a sulphide gossan within the belt.

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