The property is largely underlain by volcano-sedimentary rocks of the Lower Jurassic Hazelton Group. These rocks unconformably overlie volcanic arc sedimentary rocks of the Upper Triassic Stuhini Group along the westernmost part of the Property. Gold (and ag) mineralization is hosted in predominantly sub-vertical vein, vein stockwork, and subordinate vein breccia systems of variable intensity. The vein/stockwork systems display both parallel and discordant relationships to stratigraphy. These systems are relatively continuous along strike (several tens of meters to several hundreds of meters).
Several mineralized zones have been explored to varying degrees including (from south to north) ... Bridge Zone, Valley of the Kings (VOK or VOK Zone), West Zone, Gossan Hill, Shore Zone, and SG Zone. High-grade gold mineralization in the VOK, the current focus of the Project, occurs in a series of W-NW (and subordinate W-SW) trending sub-vertical corridors of structurally reoriented vein stockworks and vein breccias. Stockwork mineralization displays both discordant and concordant relationships to the volcanic pile stratigraphy.
Gold is typically present as gold-rich electrum within deformed quartz-carbonate (and adularia?) vein stockworks, veins, and subordinate vein breccias. Recent underground exploration carried out as a part of the bulk sample program confirmed the location of corridors of stockwork-style mineralization and the lithological contacts in this part of the deposit (within the VOK)
The Brucejack deposit is considered to be a transitional to intermediate sulphidation epithermal stockwork vein system-hosted au-ag deposit that was developed in a dynamic extensional basin. It is likely associated with a deeper porphyry system that developed within an active island arc tectonic setting.
Reported assays include hole VU-722 which encountered 37,117 grams per tonne gold uncut over 0.5 m, while SU-452 which intersected 41,582 gtp over 0.5m in 2012.
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