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The Rouyn property is underlain by two dominant rock units: 1) the predominantly mafic volcanic rocks of the Blake River Group to the north, and 2) the sandstone-to-siltstone sediments, schist 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, 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 coarse 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 fine-sized free gold.

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