Elevated uranium levels appear in what is known as the Turgeon Lake Intrusive Complex. Within this complex, the Turgeon and WeeGee Claim Blocks host a significant number of uranium occurrences identified in the course of the first staking rush in the mid 1960s. Values are in the 0.01% to 0.025% U3O8 range, but can be locally higher. The mineralization tends to be lens-like, with the scale of these lenses ranges from a few meters to at least 1,000 meters long by 300 meters wide. The remaining claim groups forming the North Shore Property (Pontbriand and Costebelle Claim Groups) lie within this corridor, and cover the major anomalies over 125 kilometers long.
Regional geochemical surveys by the Quebec government in the 1980's and 1990's showed that the Turgeon Lake Intrusive Complex, unlike other intrusive bodies in the region is highly anomalous in uranium. Large fault systems cut the intrusive, but little attention was paid to these in previous exploration efforts, even though uranium mineralization is frequently associated with such features. Their presence suggests the possible existence of major plumbing systems operational during the mineralization phase.