Alcoa announced it will buy a suite of South32 mining and processing assets for roughly $4.1 billion in cash and stock. The package includes stakes in a bauxite mine, an alumina refinery and an aluminium smelter, expanding Alcoa’s upstream footprint. The transaction values the combined assets at about $4.7 billion on an enterprise basis. Analysts see the move as a defensive hedge against supply disruptions.

Alcoa will fund the deal with an upfront $3.1 billion cash payment and roughly 17 million newly issued shares valued at about $1 billion. A contingent payment right could add up to $750 million if certain performance thresholds are met. Goldman Sachs has pledged a $3.1 billion bridge loan to bridge financing. The bridge facility gives Alcoa liquidity while it finalizes regulatory approvals.

The acquisition gives Alcoa control over a vertically integrated supply chain, from ore to finished metal, at a time when global aluminium demand is rising and producers face tightening credit. By locking in raw material access, Alcoa positions itself to improve margins and weather price volatility, delivering immediate scale to shareholders. The deal also trims South32’s exposure to the cyclical aluminium market.