The West African Craton extends across 14 countries in western Africa, and consists of two Archean nuclei in the north-western and south-western parts of the craton juxtaposed against an array of Paleoproterozoic domains made up of greenstone belts, sedimentary basins, regions of extensive granitoid-TTG plutons and large shear zones, which are overlain by Neoproterozoic and younger sedimentary basins. The borders of the WAC are largely defined by a combination of surface geology and gravity signatures (Burke and Whiteman, 1973; Roussel and Lesquer, 1991; Ennih and Liegeois, 2008a, b).