BHP Group is trading at $80.60, down 3.15% in pre-market, after first-quarter copper output fell 19% year over year. - Output was 400,700 tonnes, affected by lower grades, maintenance, severe weather and operational disruptions; Reuters said it missed analyst expectations. - Shares fell as much as 2.6% in early Sydney trading. FY2027 production guidance was unchanged, and iron ore output was steady at 66.5 million tons. - The supplied U.S. pre-market price indicates a larger decline; no pre-market volume was provided.