Chile's Antofagasta slides after reporting lower year-to-date copper output
** Shares of Chilean miner Antofagasta ANTO.L drop 6.7% to 3,333p, top loser on FTSE 100 .FTSE
** Reports copper production of 436,900 tonnes year-to-date, down 8.3% from the same period in 2025
** YTD, stock is up 8.94% as of last close