Proposed Title 1: - Queen's University

of the 2321±3 Ma Gunnar granite and the age of the 1.85 Ga major brecciation event that
overprinted the mineralized albitized granite.
Figure 5.2. Geologic cross-section through the Gunnar deposit (modified from Evoy, 1960)
The metasomatic-type U mineralization at Gunnar is genetically linked to the albite
metasomatism of the Gunnar granite because all of it was derived from the same magmatichydrothermal
alteration process. Ashton (2010) reported albite metasomatic alteration
associated with U mineralization at several localities in the Beaverlodge area but suggested
that this alteration affected a variety of rock types of different ages. There are a number of
granite intrusions in the Beaverlodge area that are coeval with the Gunnar granite, including
the Cameroon, Mackintosh Bay, Rogers Lake and White granites (Fig. 2.2). Whether the
same hydrothermal magmatic-related U mineralization system affected these granites is
currently not known.
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