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Geology

The Great Bear Project is located within the Red Lake greenstone belt of the Uchi Subprovince of the Archean Superior Province of the Canadian Shield.

The rocks of the Red Lake greenstone belt originated on an active continental margin, in a setting characterized by volcanic eruption and deposition of volcanic sedimentary sequences, which were followed by subduction-related arc volcanism and later continental collision causing metamorphism.

Geological map showing North Caribou Terrane, Island Lake-Oxford-Stull terranes, English River Subprovince with rock types.

Regional setting of Great Bear Property within the Uchi Subprovince

Regional Geology

At a local scale, the Project area is bounded by intrusive batholiths within a northwest-southeast trending belt of metavolcanic and metasedimentary rocks that are interpreted to have been formed in a marine setting next to active volcanism prior to metamorphism. The southwestern portion of the Property is within a mafic domain and consists of intercalated mafic volcanic flows, argillite, siltstone, iron formation and minor local felsic volcanics. The mafic domain hosts two mineralized zones, the Limb Zone and the Hinge Zone. Gold mineralization in the Limb Zone occurs as silica-sulphide replacement in alteration zones, including replacement of sediments if present, or as silica flooding and quartz-calcite veins. Gold mineralization in the Hinge Zone is present in quartz veins and is associated with weak carbonate quartz alteration.

Geology map of Great Bear Project showing Mafic, Ultramafic, Felsic volcanic domains and intrusion zones.

Interpreted geology from drilling, prospecting, and geophysics

At the center of the Property, a younger sequence of intermediate to mafic volcanic and volcaniclastic rocks are present, which have a similar stratigraphy compared to the western and eastern portions of the Property, but have a higher proportion of felsic pyroclastic rocks. These rocks host the most significant mineralization for the project in the LP Zone, and contain disseminated gold hosted by felsic volcanics and volcaniclastic sediments. Alteration of the LP Zone is variable and includes strong to pervasive albitization and silicification of the felsic volcanic units, and sericite and muscovite alteration of the metasedimentary units.

The northeastern portion of the Property is characterized by a felsic domain consisting of porphyritic dacite flows and volcaniclastic rocks intercalated with sedimentary layers.

Sulphide minerals including pyrite, pyrrhotite, arsenopyrite, chalcopyrite, sphalerite and galena have been observed to be associated with the mineralized zones.

Worker in a red safety vest inspecting core samples laid out on a wooden table indoors.

learn more about the Project’s geology

Aerial map showing the Great Bear Project area outlined in yellow with a pink highlighted zone inside.

Map highlighting Great Bear Project and LP Fault Zone near Red Lake and Balmertown with roads and landmarks.

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