Antofagasta Investor Day Presentation Deck

GROWTH OPPORTUNITIES 123 Organic Growth Other Growth 2020 Revised January 2021 2014 Prefeasibility study 2018 Feasibility study LOS PELAMBRES EXPANSION - PHASE 1 (in construction) Cu +60 ktpa | Capex $1.7 bn¹ (including desalination plant) ESPERANZA SUR PIT (in construction) Cu +10-15 ktpa | Capex $0.17bn³ ZALDÍVAR CHLORIDE LEACH (in construction) Cu +10-15 ktpa | Capex $0.19 bn5 2021 2015 Prefeasibility study 100% basis TWIN METALS (in FS stage) Cu Eq +65 ktpa 4 5 6 2018 Prefeasibility study 2022 2023 EXPLORATION FOCUSING ON THE AMERICAS ANTOFAGASTA PLC Cu eq +180 ktpa | Capex $2.7 bn4 2024+ PHASE 2 (in FS stage) Cu +35 ktpa | Capex $0.5 bn² 15 year LOM extension CENTINELA 2ND CONCENTRATOR (in FS stage)

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