Structural analysis and mineral association of the Matoush uranium deposit, Otish Basin, Quebec

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University of New Brunswick


The Matoush deposit is situated 260 km north east of Chibougamau in the Otish Basin, north of the Grenville Front in the Superior Province. The deposit is hosted in the Proterozoic Indicator Formation, which comprises conglomerates, conglomeratic sandstones and sub-arkosic sandstones. The deposit is structurally controlled by the Matoush Fault, which strikes 007° and dips 85°£. Mineralization is primarily uraninite lenses pitching 45°S on the fault surface. Tourmaline and eskolaite are the phases most commonly associated with the uranium mineralization. The uranium mineralization is spatially linked with chromium rich mineral phases, which is bolstered by the three-dimensional distribution of the mineral phases showing a strong zonation centered on the high grade uranium mineralization. Measurements were collected for sets of structural elements in order to establish the relationship of mineralization to deformation features. Fracture orientations indicate that the Matoush Fault is the dominant control. Similarly, veins show a clear correlation with the Matoush Fault. Fault-fluid interaction has affected element transport and concentration. However, spatial distribution and localization of uranium mineralization defies characterization by simple geometric relationships.