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Doriri Creek

The Doriri Creek hydrothermal Ni-PGE prospect contains the highest platinum metals grades known in PNG (Figs 7 & 8). Mineralisation is confined to massive magnetite-mica rock hosted in Jurassic-Cretaceous gabbro. Sulphides are rare or absent. Bismuth, antimony and tellurides are associated with the nickel-palladium-platinum mineralised zones, but mineral species have yet to be identified. The Doriri Creek lode has a strike length in excess of 520 m and the mineralised zone an average width of 10-15 m. High nickel-palladium-platinum grades are contained in the zone of massive magnetite-mica rock and surface grades average 10-15 m @ 1.3 % Ni, 1-2 g/t 2PGE (Figs 9 & 10). Narrow intervals (0.46 cm) contain up to 2.58 % Ni, 14.7 g/t Pd, 3.4 g/t Pt. Nickel-palladium-platinum concentrations decrease at higher levels in the deposit as the lode splinters and inter-fingers with stockworked argillised gabbro. Patchy gold mineralisation is present in the stockwork zone overlying the main mica-magnetite mineralised zone. A ground magnetics survey across the mineralised zone is shown in Fig 11.

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Fig 7 - Doriri Creek Ni-PGE prospect showing costean geology


Fig 8 - Doriri Creek exposure at Doriri Creek helipad


Fig 9 - Doriri Creek PGE geochemistry


Fig 10 - Doriri Creek nickel geochemistry


Fig 11 - Doriri Creek ground magnetics