Hydrothermal Attributes of the Union Bay Platinum Prospect - Abstract

At the Union Bay Alaskan-type zoned ultramafic complex (ZUC) PGE enrichment occurs within magnetite and not within chromitite, which is atypical of ZUCs. The zones of magnetite and PGE enrichment are restricted to pyroxene-rich parts of the complex. Field, petrographic, and analytical data strongly suggests that the PGE-related magnetite and PGEs are of hydrothermal origins, deposited at temperatures of ~ 700 to <400°C.