b'FeatureDiscovery and geophysics of the Khamsin depositFigure 2. Gravity station elevations. Coordinates are MGA Zone 53 and colourFigure 3.2. Residual gravity image.bar units are metres (AHD).Figure 3.1. Variable density Bouguer gravity map. Figure 4.1. Total magnetic intensity with flight lines.image respectively. These images, which still exhibit the double gravity peak and small magnetic ovoid, show the data used to constrain the model discussed below. For gravity and magnetic images, colour bar units are mGal and nT, respectively.Selection of a gravity image Figure 3.1 shows the Bouguer gravity map that was used to constrain the model discussed below, but comments on how it was selected may be useful.In addition to other corrections to the observed gravity (Blakely1995), the Bouguer correction is an attempt to account for extra (or deficient) mass under the gravimeter when the survey line crosses a hill (or a valley). This correction requires knowing the density of the hill, which is never available and must be estimated. If under corrected, as when the correction density is less than the unknown true hill density, the final gravity image tends to mimic the topography, whileFigure 4.2. Residual aeromagnetic map.FEBRUARY 2024PREVIEW 43'