Maintenance staff at the Worsley Alumina refinery, 200 kilometres south of Perth, commenced 48 hours of protected industrial action on Tuesday morning.
The strike, involving over 100 workers, coincides with a scheduled plant shutdown as unions contest pay and conditions ahead of an $8 billion acquisition by Alcoa (NYSE: AA).
- Ownership Transition: The industrial dispute centers on the pending transfer of assets from South32 (ASX: S32) to Alcoa, expected to finalize in the first half of 2027.
- Incentive Disparity: Unions are demanding the formalization of discretionary bonuses—averaging 10% of wages over the past five years—into the enterprise bargaining agreement.
- Operational Continuity: While South32 maintains that it has contingency plans to support ongoing operations, the strike occurs during a critical maintenance window at one of the world’s largest alumina refineries.
The industrial action follows a breakdown in negotiations between South32 and representatives from the Electrical Trades Union (ETU) and the Australian Manufacturing Workers’ Union (AMWU). According to the ABC, the dispute intensified after workers returned an “overwhelming ‘no’ vote” on the company’s latest enterprise agreement offer. The unions contend that the current offer fails to provide the job security required as the facility moves under Alcoa’s management.
ETU WA secretary Adam Woodage stated, “What we’re always open to do is negotiations. However, we haven’t heard from South32 since they had an overwhelming ‘no’ vote on their latest offer to this workforce.”
The financial stakes for the workforce are tied to the potential loss of discretionary payments. AMWU WA secretary Steve McCartney said that while wage increases offered by South32 were viewed as reasonable, the lack of a contractual guarantee for short-term incentives remained a sticking point, with workers seeking to secure bonuses that have averaged 10 per cent over the past five years.
Approximately 200 members are represented by the AMWU at the site. Workers gathered on a picket line along the refinery’s entrance road to protest, with some long-term employees of 15 years noting that the stoppage is intended to support newer staff who receive lower pay and conditions despite performing identical duties. Unions also highlighted a disparity in working time for those performing comparable roles across different alumina operations.
| Metric | Status / Context |
|---|---|
| Acquisition Value | $8 Billion USD |
| Projected Closing | First Half of 2027 |
| Union Stated Bonus | 10% of Annual Wages (Avg. 5-Year) |
| Refinery Operator | South32 (Spin-off from BHP in 2015) |
South32 has defended its position, asserting that its short-term benefit policy will persist under the new ownership structure. A company spokesperson indicated that the firm continues to engage with staff, emphasizing that it does not expect the current stoppage to impact broader operational output.
The facility has faced ongoing labor friction since its 2015 separation from BHP (ASX: BHP), with long-term employees reporting that conditions have been incrementally reduced over the past decade.
The acquisition, first announced in July, is designed to consolidate Alcoa’s position as a pure-play upstream aluminum producer. The deal includes South32’s 86% interest in Worsley Alumina, as well as assets in Brazil and South Africa. For the workforce, the transition to Alcoa ownership has raised concerns regarding the security of incentive payments and differences in working conditions compared to the incoming operator.
As the 48-hour window for protected action progresses, the focus remains on the feasibility of finalizing a new enterprise agreement before the ownership change concludes.
Disclaimer: The information provided in this article is for educational and informational purposes only and does not constitute financial advice.
