Antofagasta Investor Conference Presentation Deck

2022 operational and financial performance Guidance achieved: 646,200 tonnes at $1.61/lb Los Pelambres Cu production 275 kt Net cash costs $1.10/lb Costs in the 1st cost quartile Production impacted by drought Centinela ● ● Cu production 248 kt Net cash costs $1.75/lb Centinela Concentrates in the 2nd cost quartile Operating above design capacity Antucoya ● ● ● Cu production 79 kt Cash costs $2.50/lb Record throughput Record production in Q4 2022 Tight cost control, productivity improvements continued ● Zaldívar ● Cu production 45 kt Cash costs $2.39/lb Chloride Leach project commissioned Focusing on optimising mine and plant operations Transport Antofagasta plc | 2023 BMO Global Metals, Mining & Critical Minerals Conference ● ● Cost and Competitiveness Programme reduced costs by 7c/lb ANTOFAGASTA PLC Tonnage transported 7.1Mt Increased haulage capacity and efficiency Record tonnage transported 5

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