Antofagasta Stock Surges on Weaker Dollar and Stronger Copper Prices

On August 21, 2026, Antofagasta PLC's stock rose significantly in London trading as miners benefited from a weaker US dollar and firmer metal prices. The Chilean copper producer was among the top gainers in the FTSE 100.

The combination of currency tailwinds, stronger commodity prices, and sector-wide buying put Antofagasta stock back into focus for investors looking to play the copper cycle. Market data from August 21 showed Antofagasta shares rising mid-session and closing among the strongest performers in the UK large-cap index.

The rally in Antofagasta's stock was driven by a weaker US dollar, which tends to support dollar-priced commodities such as copper. A softer dollar makes copper cheaper for non-US buyers, encouraging demand and benefiting miners like Antofagasta.