Updated Jul 16, 2026 – 2.16pm, first published at 9.47amBHP says its copper production will slide by up to 15 per cent in the year ahead, in a market update that wiped close to $6 billion off its record-breaking share price rally and underlined its need to bring new resources on stream.The world’s biggest miner revealed on Thursday that an unexpected mechanical failure at one of its South Australian mines would compound a decline in the quality of ore it produces in Chile.Subscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? Fetching latest articles