From 1955 to 2008, after which the Copper Rand mill site closed, the Chibougamau mining district had produced a total of 55 Mt of ore containing 994,802 t of copper, 120 t of gold, 102 t of silver, and 72,066 t of zinc (Leclerc et al., 2017). Thus, the district is considered as the second largest mining district in the Québec portion of the AGB.

Mineral deposits of the Chibougamau area comprise the following (Guha et al., 1988; Pilote and Guha,2006):
- Synmagmatic Fe-Ti-V and Ni-Cu-platinum group element (PGE) mineralization in mafic-ultramafic layered intrusion;
- Volcanogenic Massive Sulphide deposits;
- Early polymetallic (Au-Ag- Cu-Zn-Pb) mineralization;
- Porphyritic Cu-Au ± Mo;
- Cu-Au veins in northwest-southeast and east-west shears (Chibougamau-type copper-gold); and
- Shear zone-hosted.

Corner Bay and Cedar Bay.
The Corner Bay and Cedar Bay deposits are examples of Chibougamau-type copper-gold deposits, which typically host massive to semi-massive pyrite-chalcopyrite-pyrrhotite-sphalerite-molybdenite sheared quartz veins. The main alteration assemblage consists of quartz, carbonate, sericite, chlorite, and K-feldspar with occasional albitization locally.

The Chibougamau-type deposits host copper-gold vein mineralization and are spatially associated with the Chibougamau Pluton, which hosts the Devlin deposit. The nearby DLC hosts the Corner Bay and Cedar Bay deposits as well as several other regi ........

The Corner Bay, Devlin and Joe Mann deposits are all characterized by high-grades and narrow vein widths. Projected mined tonnes from the Project (Corner Bay, Devlin, and Joe Mann) are expected to total 9.15 Mt, ramping up to a maximum capacity of 3,000 t/d over a mine life of 10.5 years.

Corner Bay.
Underground mining at Corner Bay would use the existing single portal and 2 km of development to three levels down to 115 m. The development would extend the decline ramps to a depth of 1,326 m. Most of the material would be mined by longhole open stoping with pillars, which is then backfilled, and by Avoca, a longitudinal longhole retreat mining method. A fleet of nine battery-electric haul trucks with trolley assist and six loaders would be required at maximum capacity. Trade off studies were completed to evaluate between a shaft, 42 t battery electric trucks with BaaS (Battery as a Service) technology and 50 t diesel trucks, and it was concluded that the use of 42 t battery electric trucks was the best economic option. In addition, the electric truck technology will provide benefits related to less ventilation requirements, better air quality and lower diesel consumption.

The mined material would be transported to surface and crushed and sorted at the Corner Bay site. Results from the material sorting testwork on material selected from the development stockpile at surface, which was extracted during the preparation of the 2008 bulk sample, indica ........

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