South32 Shareholders Approve $5.6 Billion Aluminium Asset Sale to Alcoa

South32 has secured shareholder approval for the sale of its aluminium assets to US-based Alcoa in a transaction valued at up to US$5.6 billion, advancing a major restructuring of the Australian miner’s portfolio.

The approval was granted at South32’s annual general meeting on 15 October 2026, with 99.18% of shares represented in the vote supporting the disposal. The transaction remains subject to outstanding regulatory approvals and other conditions, with completion expected in the first half of 2027.

The agreement covers South32’s 100% interest in Hillside Aluminium in Richards Bay, KwaZulu-Natal, and its 86% interest in Worsley Alumina in Western Australia. Alcoa will also acquire South32’s interests in Brazil’s MRN bauxite mine, Brazil Alumina refinery and Brazil Aluminium smelter.

The deal excludes Mozal Aluminium in Mozambique, which South32 placed on care and maintenance after failing to secure sufficient affordable long-term electricity supplies.

How the $5.6 billion deal is structured

The transaction comprises US$3.1 billion in cash, approximately US$1 billion in Alcoa shares, up to US$750 million in additional payments linked to future alumina and aluminium prices, and the assumption of about US$750 million in net debt and lease liabilities. Alcoa will also assume related rehabilitation provisions estimated at approximately US$1.1 billion.

The price-linked payments could provide South32 with additional proceeds if aluminium and alumina prices exceed agreed thresholds over the relevant periods. The final amount will depend on market prices and the transaction’s contractual terms.

Alcoa has raised US$2.6 billion through debt offerings to help fund the cash component of the acquisition. The financing supports its preparations to complete the deal, although regulatory approvals remain outstanding in relevant jurisdictions, including South Africa.

South32 shifts towards copper and other base metals

For South32, the disposal represents a significant change in business strategy. The company intends to concentrate more heavily on base metals, including copper and zinc, while using the proceeds and resulting balance-sheet flexibility to support growth projects and shareholder returns.

Chief executive Matt Daley has described the transaction as a major step towards building a more focused business centred on high-margin assets. South32 has identified growth opportunities at its Hermosa project in the United States and its Sierra Gorda copper operation in Chile.

The company has also said that a simpler portfolio and operating model could reduce annual overhead costs by around US$125 million over time, strengthening its capacity to invest in development projects.

Implications for South Africa’s aluminium industry

Hillside Aluminium, located at Richards Bay, is a major industrial operation with an important role in South Africa’s aluminium supply chain. Its transfer to Alcoa would bring the smelter under the ownership of a company with a substantial international aluminium production and refining portfolio.

Alcoa expects the combined assets to generate approximately US$900 million in synergies, measured on a net present value basis, through improved operational performance, lower costs and greater integration across mining, refining and smelting.

The company has also indicated that it intends to maintain operational continuity while preparing for ownership of the acquired businesses. Selling Hillside and Worsley will remove two major aluminium businesses from South32’s portfolio, leaving the company with a stronger focus on copper, zinc and its development projects. For Alcoa, the acquisition expands its control over the aluminium supply chain, from bauxite mining and alumina refining to smelting