The US-listed company started shedding its workforce at the 60-year-old Kwinana Alumina Refinery in WA in January 2024. The closure is expected to cost Alcoa about $US890 million ($A1.4 billion) in 2025 with a further $US600 million ($A912 million) hit over the following six years. Production was phased out at the facility during the second quarter of 2024, with the loss of about 1000 jobs. "I would urge Alcoa to continue to work with those workers to ensure that they're supported through this tough, tough process." "It's a sad day for Alcoa's Kwinana-based workers, local industry and the Kwinana community," chief executive David Harrison said.