KGHM launches $790M expansion at Sierra Gorda to boost copper output

KGHM Polska Miedź has broken ground on a fourth milling line at its Sierra Gorda mine in Chile, a $790 million investment aimed at increasing copper production. The move signals a supply-side response to tight copper markets, potentially easing price pressure if output ramps as planned. Construction timelines and final capacity gains remain unspecified, leaving near-term market impact uncertain.