The Murmac Bay Group exposed in the southwestern half of the Western Churchill Craton, near Uranium City, Saskatchewan consists of a mixed package of Precambrian volcanic and sedimentary rocks These rocks sit on ca. 3 Ga granitoids and have been affected by several deformational and metamorphic events.

The Taltson magmatic zone (south of 60°N) is a composite continental magmatic arc and collisional orogen resulting from the convergence of the Buffalo Head terrane with the Archean Churchill craton. The Taltson basement (ca. 3.2–3.0 Ga and 2.4–2.14 Ga) and Rutledge River supracrustal gneisses (2.13–2.09 Ga) were intruded by voluminous I- and S-type magmatic rocks between 1.99 and 1.92 Ga.

There is aggressive diamond exploration drilling in the south Slave Province, NWT, Churchill Craton (at the northwest corner of the Hudson Bay) and in Ontario. The Northwest Territories (NWT), North Slave craton and Keewatin regions of Nunavut and the north-central region of Alberta are regions that are all underlain by diamond-friendly cratonic rocks of the Slave Craton, Churchill Craton and the Buffalo Head Craton. The diamonds being found in the NWT were created 50 to 600 mya during cataclysmic explosions of kimberlite, a molten magma originating up to 400 kilometers beneath the Earth's surface.

Unlike the Slave Craton, which is covered with shallow lakes and swamp, the eastern part of the Churchill Craton is drier. Kimberlites may be obscured by foliage rather than water, therefore many targets may be drillable during the summer, not just during the short winter window when lakes are frozen and daylight is available. In comparison, drilling in the Eastern Arctic is too remote compared to the Slave Craton, which is serviced by the fully developed infrastructure of Yellowknife. The Eastern Arctic is serviced by the smaller town of Rankin Inlet, which in turn is serviced by barge during summer.