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 ........
