In his two month - long technical secondment from PIRSA to Canadian major nickel explorer and producer Inco Ltd, the mode of genesis of the Reid Brook Zone of the Voisey’s Bay nickel-copper mineralised magmatic system was analysed by the author using Weights of Evidence methods and gridded long-sections. Both methods of analysis showed a strong correlation of the loci of base metal - rich massive sulphide (MASU) accumulation with the positions where a folded horizon of quartzo-feldspathic gneiss occurs. This association corresponds spatially to the axis of inflection of the magma conduit, a previously recognised mineralisation control. Consideration of changes in the magma conduit width, along with the type and distribution of breccia clasts preserved in its ultrabasic rock fill, provided insights into the motion of magma along the conduit and enabled a model of MASU emplacement to be defined. The magma pulse associated with mineralisation appears to have travelled from depth towards the east along at least two structurally controlled axial trends. It was then deflected at the quartzo-feldspathic gneiss towards the surface. This deflection caused eddies in the magma inside the conduit, which led to extensive erosion of the wall rocks in this area and the later deposition of MASU in quiet zones adjacent to the sites of erosion. This model suggests that potential exists for finding further magma conduits occupying other axial trends at depth. These trends may have been responsible for the formation of the Discovery Hill Zone and possibly the Ovoid Zone. The intersection of the quartzo-feldspathic gneisses with a magma conduit on a trend below the Discovery Hill Zone would be a major search priority. In addition, a deeper horizon of quartzo-feldspathic gneiss was noted which may also be a focus of MASU mineralisation. Target zones for the various evidential datasets were selected and combined into a set of areas suggested for further exploration.