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

Mineralization is hosted in the Mishibishu Deformation Zone which traverses the property over a 14 km length and is interpreted as a major regional thrust fault which follows a volcanic-sedimentary contact. The northern portion of the property is underlain by mafic volcanic rocks and subvolcanic gabbroic sills. These are overlain to the south by shallow water immature arenaceous/arkosic sediments and polymictic conglomerates, followed by deeper water silts and turbidites progressing southward.

The sequence is overturned dipping moderately north, facing south and striking 90-120º. The deformation zone is 0.5 to 1.0 km wide and characterized by strong ankerite alteration and a schistose fabric dominated by phyllosilicate minerals, sericite and chlorite. Because of the intense deformation, systematic recognition of protoliths and subunits within the deformation zone is problematic.

In the Mishi Mine area, mineralization is hosted by a series of at least 8 tabular parallel zones consisting of ankerite-sericite ± chlorite alteration zones containing 2-8% fine disseminated pyrite and a system of sub conformable, dislocated, smoky grey quartz veinlets and lenses. Veins generally vary from 5-20% of the bulk volume of the zones with individual quartz lenses commonly 5-15 cm wide.

The 8 zones recognized to date are labelled from south (footwall) to north (hanging wall) M2, M4, M6, M8, M10, M12, M14 and M16. Zones M2 and M4 are close together and are merged when modelling into a Main Zone. The zones strike 100°, dip north 40° and plunge northeast. In general, the zones become more felsic, discrete and vein dominated towards the north.

Gold has been intermittently produced from the Mishi Mine since 2002. In 2012, Wesdome began continuous production from the Mishi Mine pit with the highest gold production year in 2015 when approximately 9,500 ounces were produced from the processing 132,000 t of ore. Mishi Pit has been mined out in 2020. The Company plans to use the pit as water storage as part of the water management process.

Mining was undertaken by mining contractors using conventional truck and shovel equipment. Present mining utilizes a surface fleet of equipment consisting of up to four production drills producing 2.5 inch to 3-inch diameter blast holes, up to five 50 tonne haulage trucks, up to three excavators, a dozer and surface utility vehicles on single shifts during the day. The selected truck and an excavator of appropriate size for ore and waste assuming a bench height of 5 m. However, the ramp will be located on the footwall side.

Analysis of mineable blocks on typical benches and cross-sections at the mill cut-off grade indicate the dilution will mainly appear at the ore zone-waste contact, with a minor component along the contact with low grade blocks. Mining recovery is estimated using the assumption that ore loss will mostly occur at the contact between zones and the face angle of broken rock when loading. From cross-sectional evaluation, the dilution was estimated to range between 10-12% pure waste with ore recoveries ranging between 85- 90% with good blasting practice as well as good dilution control practices.

The open pit was designed with Whittle Pit software and incorporated a ramp into the pit. The ramp was designed for only single lane traffic on both of the two separate pit bottoms. Based on productivity rate and sensitivity to the stripping ratio, the one-way ramp width has been reduced from 10.85 m to 8.0 m wide to accommodate a 50-tonne-capacity off-road class of rear-dump trucks. The ramp is located on the footwall in case the pit is enlarged or deepened. In order to reduce the volume of waste to be stripped, the last bench on each of the pit bottoms will not have a permanent ramp access. The ramp gradient is 10%, and the ramp exit is on the southwest side of the pit to minimize the haulage distance to the waste dump. The Eagle River Mill is 2 km from the Mishi Mine.

Wesdome initially leased then subsequently acquired the former Magnacon mill and tailings facilities in 1996. The mill is 17 km by road from the mine. The mill capacity was increased from 600 to 1,000 tpd in 1999. Even though the addition of a cone crusher expanded capacity to the permitted level of 1,200 tpd on a crushing basis, required maintenance time means the practical limit is approximately 1,050 tpd of Mishi open pit ore as it is configured to achieve targeted gold recoveries.

The mill employs the Merrill-Crowe process for the recovery of gold from Eagle River ore with about 40% of the gold recovered into a gravity concentrate using a Falcon gravity circuit concentrator. The Merrill-Crowe process involves cyanide solution and zinc precipitation. Precipitate is refined on site to produce doré bars containing approximately 80%-92% gold. By-product silver is recovered at a rate of one part for every six to ten parts of gold. The doré bars are shipped to the Royal Canadi ........