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Location: 58 km SE from Newman, Western Australia, Australia
Level 3, 40 Kings Park RoadWest PerthWestern Australia, Australia6005
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The Karlawinda Gold Project (KGP) is an operating gold mining operation which includes the Bibra deposit and numerous outstanding exploration targets including Carnoustie, Central Lode and Jims Vein. The project covers a total area of approximately 2,052 square kilometres.Bibra deposit GeologyBibra is part of a large-scale Archaean aged gold mineralized system. The resource is hosted within a package of deformed meta-sediments which has developed on at least two parallel, shallow dipping structures; Laterite oxide mineralization has developed over the structures close to surface. The primary mineralization is strata-bound with lineations identified as controlling higher-grade shoots. The deposit is oxidized to average depths of 50-70m.The geology at Bibra predominantly comprises a sequence of alternating Archaean amphibolites and quartz-feldspar-chlorite-garnet schists with the majority of mineralisation hosted in silicified and magnetite altered, mylonitised “psmammites”. The deposit has been defined by drilling over a 1.8km strike length and is drilled to 800m down-dip where it is still mineralised and open down-dip. The mineralised shoots are present in drilling as broad zones up to 50m wide and are continuous down plunge. It is thought the shoots are developed in dilation zones along the main structures. A large laterite and oxide weathering zone is developed over the primary geology and this is mineralised in the near surface, up-dip position of the main shoots of primary mineralisation. A thin veneer of transported sandy soil covers the deposit and is typically less than 3m thick. The transition/fresh rock boundary is about 60m below surface.Geological logging suggests alteration consisting of biotite, carbonate and magnetite mineralisation forms a halo surrounding the intense silica, pyrite and gold mineralisation. The metamorphic overprint of the mineralisation may have altered some of the primary alteration and mineralisation to the present day mineral species.MineralisationAt Bibra, mineralisation is shoot-controlled along a series of dominant low-angle, north-east trending mineralised faults that combine to make up a very large-scale mineralised system. Gold mineralisation has developed on at least two parallel, 40m thick, shallow dipping sandstone units, which dip to the west-north-west at 22°. Laterite mineralisation has developed over the structures close to surface. Outside of the main mineralisation some smaller discrete lodes occur in the hanging wall. Mineralisation continues south of the main pit area into the Southern Corridor where mineralisation is hosted in volcanoclastic sandstones with broad lower grade mineralisation with zones of high grade mineralisation. The primary mineralisation is marked by 3-10% sulphides, subhedral magnetite grains, quartz veins/veinlets, and gold. Gold mineralisation is strata-form with lineations identified as controlling higher-grade shoots. The overall footprint of the mineralisation covers an area of 1800m (local grid N) by 1800m (local grid E). The deposit is oxidised to average depths of 50- 70m.DimensionsThe Bibra mineralisation wireframes have been projected down-dip based on wider spaced drilling intercepts; however, this extrapolation has been removed from the resource estimate by limiting the reported tonnes and grade to within a conceptual optimal pit shell ($2,400/oz Au). The main laterite zone extends 1250m along strike and 1150m across. It ranges from 2m to 15m in vertical thickness.The primary mineralisation extends below the laterite zone for a further vertical depth of 360m.The transition/fresh rock boundary is about 60m below surface. The primary mineralisation has 4 main sub-parallel zones and several smaller zones. Overall, these zones extend for 1800m along strike (N-S) and 1800m across.The Berwick satellite deposit extends 400m east-west and north-south, and vertically for 115m.
