Antofagasta Investor Conference Presentation Deck

Growth projects update ● ● ● ● Los Pelambres Expansion Phase 1 68% complete Desalinated water system of 400 l/s, expected to be completed H2 2022 Expansion of concentrator to 190,000 tpd, expected to be completed early 2023 Increases production by 60,000 tonnes over 15 years Zaldívar Chloride Leach Completed in January 2022 on budget • Now being commissioned • Increases recoveries by 10ppt (10-15,000 tonnes per year) Antofagasta plc | 2022 BMO Global Metals & Mining Conference **** ● ● ● Centinela Esperanza Sur Pit New source of feed for Centinela Concentrator Reduces variability and increases production by 10-15,000 tonnes per year in the early years Autonomous trucks being commissioned Expect to complete in H1 2022 13

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