A knowledge-based qualitative method of mineral potential modelling has been applied to rank Proterozoic mafic-ultramafic intrusions in the Arunta Region of central Australia in terms of their mineral potential for three different styles of orthomagmatic Ni-Cu-Co and PGE deposits. The assessment suggests that ten of the fifteen intrusions investigated in the region have potential for basal segregations of Ni-Cu-Co±PGE sulphides (Voisey's Bay-type), whereas only two appear to have potential for stratabound PGE-bearing sulphide layers (Merensky Reef-type). The Mordor Complex was assessed to have high potential for PGE-bearing sulphide layers found elsewhere in `Alaskan alkaline-ultramafic intrusions' (e.g. Nizhni Tagil, Russia). Some mineral potential also exists for structurally controlled hydrothermal deposits of Cu-Au ± PGEs ± Ag ± Pb spatially associated with mafic-ultramafic rocks.