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Mosaic Begins a Drilling Campaign of at Least 2,000 Metres at Golden Island and Returns up to 72.8 g/t Au, 42.5 g/t Ag and 0.42% Cu at Surface

Mosaic Minerals (CSE: MOC) reported assay results from 343 samples collected in its summer 2026 exploration campaign at the Golden Island gold project in Abitibi, Quebec, and started a diamond drilling program of at least 2,000 metres. The highlight samples returned 72.79 g/t Au and 66.92 g/t Au, and sample C0381259 also returned 42.5 g/t Ag and 0.42% Cu. Metallic screen re-assays confirmed coarse gold, with fractions grading up to 2,842 g/t Au. Of the 343 samples, 9 assayed above 10 g/t Au, 17 above 5 g/t Au and 45 (13% of the total) above 1 g/t Au. The drill rig is now on the island, with about a dozen holes planned to test high-grade veins at depths of 150 to 300 metres.

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