Groundradar was contracted to conducted borehole tomography surveys at a nickel laterite project in New Caledonia. Borehole tomography provides one of the highest resolution views of the subsurface, and reveals a number of important soil and rock parameters such as radar velocities, and attenuations. Using the Topp relation, water saturation and porosity may also be derived from the tomographic cross-section. Borehole surveys are also commonly applied in the detection of un-mapped tunnels in open pit mine sites.