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Location: 56 km NE from Perth, Western Australia, Australia
Level 3, 46 Colin StreetPO Box 428PerthWestern Australia, Australia6005
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The target deposit type is an orthomagmatic PGE-Ni-Cu-Co sulphide deposit, within the Yilgarn Craton. The style of sulphide mineralisation intersected consists of massive, matrix, stringer and disseminated sulphides typical of metamorphosed and structurally overprinted orthomagmatic Ni sulphide deposits.The Gonneville Deposit is located at the southern end of a newly recognised >30km long MaficUltramafic Intrusive Complex (the “Julimar Complex”). Its ultimate lateral and depth extent is yet to be determined.The mafic-ultramafic intrusive belt is prospective for magmatic sulphide mineralisation and has a rare chonolith-like geometry, which is similar to other major mafic-ultramafic orthomagmatic systems worldwide that host some of the world’s largest nickel-copper+/-PGE deposits, including NorilskTalnakh and Jinchuan7While Gonneville is one of the largest recent nickel-copper-PGE sulphide discoveries worldwide, and the largest PGE discovery in Australian history, the vast majority of the >30km long Julimar Complex remains unexplored.The Deposit is located within a ~1.9km x 0.9km x 0.8km section of the Julimar Complex, known as the Gonneville Intrusion, which has a north-north-east strike, a maximum thickness of approximately 650m, and a 45° dip to the west-north-west.The Gonneville Intrusion is composed predominantly of serpentinised olivine peridotite / harzburgite (serpentine-magnetite-amphibole-chromite) with lesser intervals of pyroxenite (amphibole-chlorite), gabbro and leucogabbro (clinozoisite-amphibole) divided into a series of eight litho-geochemical domains based on geological logging and detailed litho-geochemistry modelling. The eight domains represent internal magma differentiation within a multi-phase, fractionating ultramafic intrusion. The litho-chronological domains broadly parallel the strike and dip of the Gonneville Intrusion.All intrusive rock-types are replaced by metamorphic mineral assemblages although texturally the rock-types are mostly well preserved at the macro-scale to allow the usage of igneous terminology. The Gonneville Intrusion is bounded to the west (Hanging wall) by felsic gneiss/metasediment and to the east (Footwall) by a succession comprising metasediments (sulphidic pelite) and amphibolite of uncertain protolith. The Gonneville Intrusion and surrounding country rocks have been subject to heterogenous deformation which is manifest by localised ductile shear zones and brittle faults and intruded by granitoid sills/dykes which broadly parallels the dip and strike orientation of the Gonneville Intrusion. A series of sub-vertical, north-east to north-west striking dolerite dykes cross-cut the entire geological succession. Both the granite intrusion(s) and dolerite dykes are un-mineralised.Primary Ni-Cu-PGE sulphide mineralisation occurs principally within the ultramafic domains of the Gonneville Intrusion and to a lesser extent in gabbro subunits. Mineralisation occurs as a series of subparallel sulphide-rich zones (>20% sulphides), typically 5m to 40m wide, that occur within broader intervals (100m to 150m wide) of weakly disseminated sulphides. The orientation of the higher-grade mineralised sulphide zones suggests an association with the lithochronological domains within the intrusion. Although the ratio between the primary sulphide phases changes between, and within, the sulphide-rich and sulphide-poor zones, sulphide mineralisation consists of a consistent assemblage of pyrrhotite-pentlandite-chalcopyrite +/- pyrite. Sulphide content and metal grade are well correlated, with higher sulphide concentration corresponding to higher metal content.DimensionsThe main part of the mineral resource within the Ultramafic extends for a strike length of approximately 1.8km and is 600 to 800 m thick. Plan width of the sub-parallel, high grade Pd zones ranges from m to ~60m, for the high grade Cu zones from 4m to ~160m and for the high grade Ni zones from m to ~60m. Plan width of the encompassing sulphide poor zones varies from 100 to 150m. The reported Measured Mineral Resource is within approximately 130m of surface. The reported Indicated Mineral Resource is within approximately 450m below surface. The reported Inferred Mineral Resource is within approximately 900m below surface.
