Antofagasta Results Presentation Deck

1 2 Growth portfolio update Developing our project By the end of 2022 First 10 years Los Pelambres Expansion Phase 1 • 93.4% complete ¹ • 400 l/s desalination plant and concentrator expansion to 190,000 tpd • In production Q2 2023 Flotation ● ● Centinela Second Concentrator Board decision expected during 2023 • Estimated capital cost $3.7 billion ● Terciary crusher (HPGR) Antofagasta plc | 2022 Full Year Results Stockpile Mills Stockpile ANTOFAGASTA PLC Secondary crusher 95,000 tpd throughput 170,000tpa CuEq² Moves Centinela to 1st quartile of net cash costs 25

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