Analysing the gravimetric, elastic and magnetic property of Earth for recording, modeling, analyzing and presenting the computer-based data. These data decide where to drill. The is explored using gravimetric, and magnetic techniques. During the primary survey, only the gravimetric and magnetic technique is used to explore the underground property of the site. The is used to create 2D or 3 D image of the rocks containing . Aerial photographs are obtained by remote sensing to map and locate the surface features.