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Northern Star Resources is upgrading its KCGM operation in Kalgoorlie, Western Australia, with a A$1.5 billion expansion of the Fimiston mill, increasing capacity from 13Mtpa to 27Mtpa. This project, approved in June 2023, targets gold production of 750,000-800,000 ounces in FY27 and 850,000-900,000 ounces by FY29.

The upgrade includes advanced automation for improved recovery rates and reduced operating costs. The mill is set to be commissioned in 2026, with production gains expected to ramp up from FY27. The project has a post-tax internal rate of return of 19% at an assumed gold price of A$2,600 per ounce.