SYDNEY, May 19, 2026, 08:04 AEST
- South32 was last at A$4.03, down 4.28%, before the ASX opened Tuesday.
- The S&P/ASX 200 dropped 1.45% on Monday, weighed down by a slide in materials stocks.
- Sierra Gorda, which is 45% owned by South32, has set out a $100 million exploration plan in Chile.
South32 Ltd is expected to resume trading in Sydney after tumbling earlier. Investors are looking at a new copper expansion plan in Chile, but the mood is cautious with project costs still in focus and a wider downturn for Australian mining stocks.
South32 shares closed at A$4.03 on Monday, falling 18 cents, or 4.28%. Roughly 17.7 million shares changed hands. The ASX cash market is open from 9:59 a.m. to 4 p.m. Sydney. The stock wasn’t trading locally yet on Tuesday at the dateline cut. StockAnalysis
ASX 200 dropped 125.5 points, or 1.45%, to 8,505.3 on Monday, putting in another short-term low. The fall hit materials stocks hardest. South32 fell with bigger names like BHP, Rio Tinto and Fortescue. The timing mattered as the broader market was already on the slide. Asx
Sierra Gorda, the copper mine in Chile owned by KGHM (55%) and South32 (45%), will invest $100 million in exploration across five years to try to boost production and keep the mine running longer, general manager Marcelo Bustos told El Mercurio, Mining.com reported Monday. Bitget
Bustos said Sierra Gorda is working on three mid-term projects: more exploration planned for 2028 to 2032, pushing the mine life out to 2049 instead of 2035, and maybe boosting concentrator capacity up to 165,000 metric tons a day from 130,000. The concentrator turns ore from the mine into higher-grade material for sale or more refining. Bitget
South32 is leaning into copper. The metal is key for power grids and electrification, and South32 has been looking to boost its exposure to copper, zinc and silver as it deals with older aluminium and manganese operations.
But investors aren’t letting South32 off easy. The company’s Hermosa project in Arizona is still the big execution risk. South32 lifted first-stage capital costs for Hermosa to $3.3 billion, up from $2.2 billion, and delayed first production to the back half of fiscal 2028. Capital costs are the funds needed to build or expand a mine. The Northern Miner
RBC Capital Markets analyst Kaan Peker said the Hermosa changes “undermine the project’s investment case.” BMO’s Alexander Pearce put it at “essentially break-even” under the bank’s price forecasts, The Northern Miner reported. The Northern Miner
South32 CEO Graham Kerr said the business is still generating cash. In the March-quarter update, Kerr pointed to operating results and commodity price moves adding US$121 million in net cash, even after US$158 million in growth spending at Hermosa. MarketScreener
South32 trimmed its fiscal 2026 production outlook for Australia Manganese by 6%, blaming high water from wet-season rain and Tropical Cyclone Narelle. The lower guidance puts a fresh operating metric in focus for investors ahead of the June-quarter update. MarketScreener
South32 said in its latest quarterly report that freight rates and raw-material costs are up because of the Middle East conflict, and flagged that those higher costs could stick around if pressure keeps up. The company said cost inflation makes it more expensive to produce the same output, which can squeeze margins even with steady commodity prices. MarketScreener
Sierra Gorda’s exploration plans and the potential for higher capacity could boost South32’s copper exposure while long-life base-metals assets remain in demand. But there’s risk on the other side. If Hermosa faces more delays, manganese stays capped, or costs such as freight and inputs climb, the shares may stay stuck on execution issues instead of copper upside.
