Peter Oluwanishola Mafimisebi, Jemilah Abdulrahman Abdulrahman

Ilero and its environs are part of the Kajola local Government area, Oyo State, and fall within the basement complex of southwestern Nigeria. The research work was focused on the geological mapping of the area and the study of the different rock and minerals units to determine the mineral resources of the area using petrographic, geochemical, and XRD analysis. The geochemical analysis showed the rocks and minerals to be diversely composed of 54-97% SiO2, 0.1-20% Al2O3, 0.8-4% MgO, 0.5-6% Fe2O3, < 1% K2O, TiO2 and minor amounts of trace elements including copper, manganese, and lead. The mineralogy of the rocks and ore mineral comprised of quartz, biotite, hornblende, alkali feldspars, and tourmaline. There are also indications of the presence of chlorite and some ferromagnesian minerals such as pyroxene and olivine. The rocks are predominantly acid rocks along with a few basic rocks.