Both the Eagle River and Mishi deposits are mesothermal lode gold deposits hosted by Archean Greenstone Belts.

The Eagle River deposit has been described as a vein type deposit along a regional deformation zone with discrete brittle-ductile shears localized along lithological contacts (Heather 1986 and 1991).

Gold bearing quartz veins at Eagle River are hosted primarily by subvertical to steeply north dipping east-west striking shear zones within an elliptical quartz diorite stock with dimensions of 2.0 kilometres east-west and 0.5 kilometres north- south.

The quartz diorite stock intrudes a steeply dipping north-facing sequence of thin mafic to intermediate volcanic flows, flow breccias and interflow volcaniclastic rocks.

A number of different ore zones have been distinguished that constitute different segments of the overall shear zone corridor and each has its own gold grade characteristic. Mineable portions of the individual zones form ore shoots that plunge steeply to the east. The bulk of the historic production has come from Zone 8 and Zone 6, which are entirely within the intrusive quartz diorite, while Zone 2 mineralization is hosted in sheared mafic volcanic rocks just east of the stock.

In general, the ore shoots mined to date occur at a spacing of 400 metres along a 2.4 kilometre strikelength. They appear to be spatially related to an array of oblique 110º striking mafic dykes, which pre-date mineralization ........

The ERC comprises of two mining operations, the active underground ERM and the open pit Mishi Mine which is not currently in production. Mishi has a small stockpile remaining which will be processed in 2022. With the purchase of the Mill, Wesdome acquired the Magnacon Mine, however has never been active since the acquisition.

Mishi ore feed in 2021 and planned in 2022 is all stockpiled material. The Mishi pit was permitted in 2020 to be a temporary storage reservoir for Mill process water, which is to be seasonally pumped back to the Mill site for treatment and ultimate discharge to the environment. There is currently no planned production or Mineral Reserves associated with the site. There is only an Inferred Mineral Resources.

The ERM was initially mined using a shrinkage mining method before converting to its current mining method of captive sub-level open stoping with access to the sub-level provided by Alimak raises, a variant of longhole mining. The site is currently transitioning to mechanized sub-level open stoping with access to the sub-levels being provided by ramp access.

Currently, ERM utilizes a mix of captive and mechanized access to the sub-levels depending on how close the ramps are. Mechanized access is more productive, but also requires more lateral development with some areas being unable to support mechanized access. Minimum mining widths are 1.5 with 1 m of external dilution expected. The ore body strikes eastwest with str ........

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The Eagle River Mill (Mill) is permitted for up to 1,200 tonnes per day (t/d) on a crushing basis.

The Mill comprises the following unit operations:
• Three ore pads for stockpiles, to separate Eagle and Mishi ore;
• Primary and secondary crushing of run-of-mine (ROM) material;
• Primary and secondary grinding of fine ore;
• Gravity recovery of cyclone feed;
• Trash screen and pre-leach thickener;
• Leach circuit;
• Merrill-Crowe circuit;
• Tailings filtration;
• Refinery;
• Cyanide detoxification;
• Metallurgical laboratory.

Gravity Circuit
The gravity circuit includes centrifugal concentration fed via a 2 mm guard screen. Feed to the gravity circuit is a portion of the cyclone feed (varied based on feed tonnage). The guard screen oversize material reports to the primary ball mill.

The guard screen undersize material is fed to the centrifugal concentrator via gravity. Operation of the gravity ........