Phase 1 Geoscientific Desktop Preliminary Assessment of Potential Suitability for Siting a Deep Geological Repository for Canada’s Used Nuclear Fuel

The portion of the river extending through the Nipigon area is about 28 km long, dropping 21 m from the north to the south boundaries of the area. [...] In the southern and western portions of the Nipigon region (Figure 3.2), the Proterozoic sedimentary rocks of the Sibley and Animikie groups unconformably overlie the Archean metasedimentary rocks of the Quetico Subprovince. [...] Rocks of the Animikie Group are not known to occur within the Nipigon area, but their presence in the Sibley Peninsula to the southwest of the Nipigon area and along the Lake Superior coast to the southeast suggests that rocks of the Animikie Group likely covered much of the Nipigon area during the Paleoproterozoic Era. [...] Following the deposition of the Animikie Group, erosional conditions returned and prevailed within the Nipigon area (Cheadle, 1986), reshaping the Archean paleosurface at the time of deposition of the Sibley Group. [...] The Sibley Group unconformably overlies the Rove Formation of the Animikie Group and, more commonly in the Nipigon area, the Archean rocks of the Quetico Subprovince.