In this study, ground magnetic survey of Sumaje Village, Ogo Oluwa area of Oyo State, Nigeria using high resolution proton-precession geometric magnetometer model G-856AX measures total components of the ground magnetic. The field data was qualitatively and quantitatively interpreted. Profile 1 has the highest amplitude of 18.2 nT and profile 2 has the highest width of 32 m. The depth to the basement rocks ranges between 6.25 to 13.75 m. The highly mineralized region of the study area is between traverse 1 to 5. Magnetic anomaly obtained varied between a minimum negative peak value of about -14.3 nT and a maximum positive value of about +3.8 nT. The maximum depth to basement rock is about 13.75 m. Ground magnetic contour map, 3-D map, and vector map showed that magnetic anomalies are as a result of rocks present in the region. The major rocks and minerals suspected to be found in this studied area and its environs are slate, gneiss, serpentenite, rhyolite, pegmatite, gabbro, basalts, oceanic basalts and hematite.
Key words: Magnetic field, magnetic anomaly, magnetometer and Sumaje village.
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