Octava Minerals has launched exploration at its Federation copper, zinc, silver and tin project in Tasmania, re-opening historic ground last worked in the 1980s. The company has already tracked down Renison Associated Tin Mines’ old drill holes and adits at the Sweeney’s prospect, where previous sampling lit up with hits including 4.17 per cent zinc, 3.32 per cent tin and 1.23 per cent lead, pointing to untapped potential.