The aim of this study is to delineate the areal extent of and estimate depths to a basaltic intrusion –Fahdi domal structure (FDS) – in the western desert of Egypt. The study also shed light on the different phases of deformations associated with this intrusion. For this purpose, we integrate total field ground magnetic data and aeromagnetic data, collected for a wider area surrounding this dome, to characterize the basaltic intrusion in terms of depth and magnetic susceptibilities and evaluate the subsurface structure caused by this intrusion in the surrounding areas. The magnetic data was reduced to the North Pole to get RTP magnetic data with anomalies centered on the subsurface causative bodies. Different Filtering techniques were applied including; regional-residual separation using power spectrum method, downward continuation, structural trend analysis and depth estimation for the basement sources. The depths were calculated using power spectrum technique, analytical signal tool and Euler deconvolution. 2D and 3D modeling of RTP magnetic profiles were applied to validate the results of depth estimation. Apparent magnetic susceptibility values were also calculated and plotted as a contour map to delineate the subsurface distribution of rocks rich in magnetic minerals. The maps show large magnetic anomalies due to basaltic intrusion within the sedimentary rocks trending more or less NNW-SSE and high probability multi-phase nature of intrusion activities. The structural measurements include joints, folds and faults. Most of the measured faults are normal faults with vertical striations on their plains. Some of the measured joints were filled with calcite. These structures are often due to tension caused by uparching of the brittle limestone rocks to give the domal structure of Kolit Fahdi.