Osisko has announced a new, significant high-grade gold discovery approximately one km (0.62 mi) north of its Windfall gold project located in the Abitibi greenstone belt, Urban Township, Eeyou Istchee James Bay, Québec. The discovery dubbed ‘Golden Bear’ has returned 27.4 g/t Au over 6.7 m (22 ft).
Golden Bear is situated within a package of andesitic to dacitic rock intruded by felsic porphyries. Mineralization is hosted in an altered andesite and occurs as pyrrhotite replacement in grey to translucent pervasive silica and quartz-carbonate-pyrrhotite veins. Replacement mineralization is associated with strong pervasive silica alteration and contains trace to 15% disseminated and clustered pyrrhotite with local visible gold and trace amounts of sphalerite-chalcopyrite. Vein-type mineralization is associated with a halo of pervasive sericite-chlorite ± ankerite alteration containing sulphides (predominantly pyrrhotite with trace sphalerite, chalcopyrite, pyrite, galena and arsenopyrite) and local visible gold.
‘We believe that this new high-grade discovery may similarly have a significant positive effect on our development plans for the Windfall camp. It certainly underscores the highly prospective nature of Osisko’s strategic land package surrounding Windfall, the vast majority of which has yet to see any drilling,’ commented Osisko Mining CEO John Burzynski.