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MMG's Rosebery mine in Tasmania celebrates 90 years of continuous operation in 2026, marking it as one of Australia's longest-running mines. Operations began in February 1936 after initial discovery in 1893.

The mine produces zinc, copper, lead concentrates, and gold doré through mechanised underground mining. Rosebery currently has its largest mineral resource, supporting MMG's plans for continued operations beyond 100 years. Events are planned throughout the year to honor the milestone, starting with a celebration for the 650 employees in February and community events later.