Antofagasta Results Presentation Deck

Growth opportunities Organic Growth Other Growth 1 Revised January 2021 2 2014 Prefeasibility study 3 2018 Feasibility study 2020 2021 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 4 2015 Prefeasibility study 5 100% basis 6 2018 Prefeasibility study 2022 TWIN METALS (in FS stage) Cu Eq +65 ktpa6 2023 EXPLORATION FOCUSING ON THE AMERICAS 2024+ PHASE 2 (in FS stage) Cu +35 ktpa | Capex $0.5 bn² 15 year LOM extension CENTINELA 2ND CONCENTRATOR (in FS stage) Cu eq +180 ktpa | Capex $2.7 bn4 ANTOFAGASTA PLC 23

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