In this study we delineate the subsurface structures in an open field in Oduduwa University, Ipetumodu, Osun State covering 500m2 using magnetic methods. The goal is to estimate depth to top and centre of mineral deposit of the study area. Ground magnetic survey was carried out along ten (10) profiles. The data set was processed and interpreted using a series of techniques and software (the slope methods, trend analysis and Golden software). The results indicate that profile 1 has the highest amplitude of 12.4 nT followed by profile 5 with 10.2 nT. The depth to basement top estimate ranges from 2.25 to 6.65 m while depth to center ranges from 8 to 25m. The magnetic anomaly obtained is between -8.8 nT and +5.8 nT. The ground magnetic contour, 3-D and vector maps 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 area and its environment are slate, gneiss and serpentenite. The high intensity values strongly suggest the presence of ferromagnetic minerals. The suspected points to have a high presence of minerals in the study area are between profiles 1 and 5.
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