The Brucejack Deposit is interpreted to be a deformed porphyry-related transitional to intermediate sulphidation epithermal high-grade gold-silver vein, vein stockwork, and vein breccia deposit that formed between 184 to 183 Ma (Board and McNaughton 2013; Tombe et al. 2018; Board et al. submitted). High-grade gold-silver mineralization was formed in association with a telescoped, multi-pulsed magmatic-hydrothermal system beneath an active local volcanic center (Board et al. submitted).

The Brucejack Deposit has many characteristics in common with intermediate sulphidation epithermal systems. Intermediate sulphidation epithermal systems occur in calc-alkaline andesite-dacite arcs and can be spatially associated with porphyry systems and individual volcanic centers (Sillitoe and Hedenquist 2003).

The Brucejack Project area 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 western-most part of the Brucejack Project area. The rocks are variably altered and deformed, with zones of intense quartz-sericite-pyrite (phyllic) alteration being associated with increased deformation due to preferential strain partitioning in sericite-rich zones. A north-south trending, broadly arcuate, concave-westward 0.5 to 1.5 km wide band of variably phyllic-altered rocks and associated quartz stockwork extends over 5 km across the ........

Brucejack Gold Mine development has been ongoing since the start of commercial production in 2017. The execution of the mine plan closely matches the mine plan as disclosed in the 2014 FS (Ireland et al. 2014). Locations for some infrastructure items have been adjusted to improve practicality as the mine has developed. These changes include the location and type of the main dewatering system and the utilization of settling sumps to pump the sediment and slimes directly to the mill clarifier. The explosives magazine was moved to isolate the location from the main works and to allow direct ventilation exhaust to surface in the event of combustion or explosion. The layout for the underground service facilities was also modified.

The updated underground mine design supports the extraction of 3,800 t/d of ore through a combination of transverse and longitudinal LHOS. Paste backfill is integral to the mine plan to maximize both orebody recovery and mining productivity. Modern trackless mobile equipment is employed in the majority of mining activities.

A main decline, designated as the Valley of the Kings access, extends from the surface portal near the concentrator and is used to access the mine and as a conveyor way. The conveyors installed have a combined length of 800 m. The existing West Zone portal will continue to provide access (and egress) to the mine and serve as the main access for large underground equipment and waste haulage.

A fleet of ........

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The process plant reached full operation in Q4 2017. Since then, new test programs have been conducted to further improve the mill operation. In 2018, further throughput increase reviews and test work were conducted by mill metallurgists and engineers, equipment suppliers, and independent consultants to improve the mill operation in an effort to increase the mill throughput to 3,800 t/d. Most of the mill upgrading has been completed, excluding the installation of the third cleaner flotation cell and the new flocculant system, which are currently being installed. As reported, the mill was operated at 4,065 t/d in Q4 2019.

The process flowsheet originally developed for the Brucejack Gold Mine uses a combination of conventional bulk gravity concentration and sulphide flotation. The gravity concentrate is refined in the gold room on site to produce gold-silver doré by directly smelting the upgraded gravity concentrate. The doré is shipped by air to precious metal refineries loca ........