Antofagasta Shares Surge Amid Storm-Related Production Cut

Antofagasta PLC's stock is up over 4% on August 21, 2026, as investors react to a cut in its 2026 copper production guidance due to severe storms in Chile. The company lowered its forecast from 650,000-700,000 tonnes to 625,000-655,000 tonnes.

The reduction of 25,000-45,000 tonnes is around 4-7% on the midpoint of Antofagasta's 2026 outlook and embeds a more cautious assumption about future weather-related downtime. The company still expects significant growth compared to earlier in the decade.

A weaker US dollar has supported metal prices, contributing to the positive share price reaction. Other mining equities are also advancing, with Antofagasta leading peers such as Fresnillo and Endeavour Mining.