South32 Pumps Aluminium Output to Seize High Prices

Why It Matters

Higher aluminium prices boost revenue potential, but South32’s uneven output and rising input costs highlight operational risk. The strategic pivot to copper and zinc diversifies earnings and mitigates exposure to volatile aluminium markets.

Key Takeaways

• LME aluminium price hits $3,557/t, four‑year high
• Hillside smelter ran near max capacity, output fell 3% QoQ
• Mozal placed on care, production dropped 28% to 65,000t
• Brazil aluminium stabilised, now ahead of guidance after December outages
• South32 redirects capex to copper, zinc, silver, spending $496M on Hermosa

Pulse Analysis

The global aluminium market has entered a tight supply phase, with the London Metal Exchange price soaring to $3,557 per tonne – the highest level in four years. The surge is largely attributed to geopolitical tensions in the Middle East, which have constrained shipping lanes and forced several regional smelters to curtail output. Higher freight rates and a spike in caustic soda costs have further squeezed margins, prompting producers to reassess capacity utilization and pricing strategies.

South32’s response reflects a mixed operational picture. Its Hillside smelter in South Africa is testing the limits of its technology, yet output slipped 3% to 176,000 tonnes and sales fell 16% after a key shipment was deferred to the June quarter. In Mozambique, the Mozal facility entered care and maintenance on March 15, slashing production by 28% to 65,000 tonnes as the company could not secure an affordable electricity tariff. Conversely, Brazil Aluminium has rebounded from December’s pot outages and electricity disruptions, now running ahead of its production guidance. Both alumina assets face cost pressures from rising freight and caustic soda prices, underscoring the broader input‑cost challenges across South32’s portfolio.

Looking ahead, South32 is reallocating capital toward higher‑margin base metals. The firm spent $496 million on the Hermosa copper‑zinc‑silver project in the United States and expects a final environmental decision by late 2026, paving the way for infrastructure build‑out. This strategic shift aims to diversify earnings away from the volatile aluminium segment, offering investors a more balanced exposure to commodities that benefit from the ongoing electrification and renewable‑energy transition. The company’s ability to manage cost inflation while scaling its copper and zinc operations will be a key determinant of its long‑term profitability.