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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 Gonneville 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, maximum thickness of approximately 650m, and a 45° west-north-west dip.The Gonneville Intrusion is composed predominantly of serpentinised olivine peridotite/harzburgite (serpentine-magnetite-amphibolechromite) with lesser intervals of pyroxenite (amphibole-chlorite), gabbro and leucogabbro (clinozoisite-amphibole) divided into a series of eight litho-geochemical domains.The weathering profile in the area extends to approximately 30-40m below surface. A welldeveloped laterite and saprolite profile is present which contains elevated palladium grades from near-surface to a depth of approximately 25m. There is a narrow transition zone between the oxide and sulphide zones, which is generally < 15m thick.The litho-geochemical domains broadly parallel the strike and dip of the Gonneville Intrusion and are interpreted to represent discrete magma influxes and associated fractionation units. The intrusion is crosscut by a later granite body, which broadly parallels the dip and strike orientation of the maficultramafic package.Crosscutting the entire intrusive package is a series of sub-vertical, north-east to north-west striking, dolerite dykes. Both the granite body and dolerite dykes are un-mineralised. A package of metasedimentary rocks surrounds the Gonneville Intrusion. Although texturally the intrusive rock-types within the complex are moderately well preserved, permitting the use of igneous terminology, all rock units have been replaced by mineral assemblages characteristic of upper greenschist to lower amphibolite facies metamorphism.The Gonneville Intrusion is bounded to the west (hanging wall)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 parentage.MineralisationPrimary Pd-Pt-Ni-Cu-Co-Au sulphide mineralisation occurs principally within the ultramafic domains of the Gonneville Intrusion and, to a lesser extent in gabbro subunits. Mineralisation is present as subparallel sulphide-rich zones (>20% sulphides), typically 5-40m wide, that occur within broader intervals (~100-150m wide) of weakly disseminated sulphides. The orientation of the higher-grade mineralised sulphide zones suggests an association with the litho-chronological domains within the intrusion.There are four typical sulphide mineralisation types recognised at Gonneville:• Massive sulphides: >75% (by volume) sulphide;• Matrix sulphides: 40% to 75% sulphide; also referred to as net-textured, typically occurs as interconnected pyrrhotite-pentlandite-chalcopyrite mineralisation with silicate gangue;• Stringer sulphides: 10% to 75% sulphide. Stringer sulphide mineralisation is typically observed around faults or lithological contacts;• Disseminated sulphides: <40% sulphide. Disseminated sulphide mineralisation occurs as either heavily disseminated chalcopyrite or disseminated/blebby sulphides with 0.5cm to 1.0cm diameter sulphide blebs with variable pyrrhotite, chalcopyrite and pentlandite contents.Although the ratio between the primary sulphide phases changes between, and within, the sulphiderich 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.
