Accumulations of metal sulfides, and other special rock materials that allow flow of electrical fields, can be mapped from the air or on the ground by measuring the magnetic fields those currents generate. The capacity for electrical fields to flow in the sub-surface is called electrical conductivity. Areas of current flow show up as having high conductivity, whereas areas that resis current flow have high resistivity. Whereas IP methods target broad clouds of metal sulfide minerals, EM methods are very effective at identifying massive accumulations of metal sulfides, which act like electrical wires in the subsurface.
HPX and its partner Computational Geosciences Inc. generate the largest and most accurate 3D models of subsurface conductivity from EM data gathered on land or in the air. These models provide enhanced resolution in target areas of interest allowing more informed targeting decisions, and improved geological discrimination.