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.

The primary Mishi Mine pit was mined out in 2020. Stockpiled ore at the end of the year will be processed in 2021 as per milling capacity availability.

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 ........