BHP Group shares dropped 4.1% on the Australian Securities Exchange on September 11, 2026. This decline marked the stock's worst single-session performance since mid-June. The benchmark S&P/ASX 200 index hit a two-month low during the broader mining sector slump.
Falling copper prices primarily drove the sell-off. Market volatility followed a Reuters report that the White House remains undecided on refined copper tariffs.
Investors shifted capital toward defensive assets amid fears of persistent inflation. Potential monetary policy tightening further weighed on market sentiment.