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Archean domains: these are the predominantly mafic volcanic rocks of the Blake River Group to the north, and the sandstone-to-siltstone sediments, schists and gneisses of the Pontiac Group to the south. They are overlain by the Temiscaming Group, a narrow, E-W trending elongated lens of conglomerates, sandstones and siltstones, and intruded by late diabase dykes. The general strike is east-west, and dips are to the north at 70°. The Cadillac-Larder Lake Break is the major structure of the area.

Gold values are widespread on the Rouyn property, where gold occurs in two main mineralized zones: 1) in silicified and brecciated, fuchsitic carbonate-altered rocks (altered ultramafic rocks of the Piché Group); and, 2) in silicified and veined meta-sediments that structurally underlie the Piché Group.  The carbonate rock typically contains free gold in quartz-veined and brecciated lenses with few sulphide minerals, while gold in the meta-sediments is characterized by a strong association with sulphide minerals and little free gold. Gold-bearing syenitic dykes and sills are also found on the Rouyn Property. The gold-bearing rocks at Rouyn are very similar to those in the mine sequence at Kerr-Addison.

At the Kerr-Addison deposit, gold occurs primarily in two types of mineralization: carbonate ore and so-called 'flow' ore. Carbonate ore occurs in irregular brecciated fuchsitic lenses containing free gold within the carbonate rocks (Piché Group equivalent), as at Rouyn.  The flow ore is hosted by carbonated lava flows, graphitic argillite (meta-sediment), and tuffs that contain pyrite, arsenopyrite, chalcopyrite, sphalerite and galena, while at Rouyn this type of mineralization is mainly hosted in meta-sediments of graphitic argillite and greywacke.

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