Red Lake is located within one of the world’s most prolific gold camps, located approximately 230 kilometres northwest of Dryden, Ontario. Goldcorp’s active mining operation covers approximately 2,335 hectares and is accessible by Highway 105, which heads north from the Trans-Canada Highway. Daily commercial air services connect the numerous local communities to both Thunder Bay and Winnipeg.
Red Lake, Canada
The Red Lake operations are situated in the eastern part of the Red Lake Greenstone Belt in the Birch-Uchi Lake Subprovince of the Superior Province, within the core of the Canadian Shield. The Balmer Assemblage, which hosts the Red Lake Gold Mines, is part of the oldest sequence in the belt, consisting of a highly deformed Mesoarchean tholeiitic volcano-sedimentary complex, which locally plunges steeply to the southwest. This folded volcanic package is in contact with the main regional unconformity up against the Neoarchean sedimentary dominated Bruce Channel Assemblage.
This “world-class” deposit occurs within predominantly intensely altered mafic and ultramafic rocks, with lesser amounts of intercalated intermediate to felsic intrusive rocks and chemical to clastic sedimentary units. Hydrothermal alteration of the deposit consists of multiple superimposed zoned alteration events. Early widespread alteration and carbonate vein formation was controlled by permeable shears, faults, lithologic contacts and other high angle brittle structures. This early stage alteration provided ground preparation and control for the late stage silicious ore fluids, which overprinted the earlier alteration and formed more discrete mineralization along active dilatant structures.
Ore types include silica replaced carbonate veins with free milling gold, siliceous replacement-type mineralization (rich with arsenopyrite) marginal to veins, broad disseminated sulphide mineralization along major shears, and some minor sulphidized chemical sediment-hosted ore.