Antofagasta Investor Conference Presentation Deck

Growth projects update ● ● ● www Centinela Second Concentrator Increases annual production by 180,000 tonnes of copper equivalent Investment decision expected end 2022. PFS capital estimate $2.7bn First production expected 2025 Detailed engineering and execution plans being prepared Financing options for current and new water systems being evaluated • Leaches primary sulphides with recoveries of 70% or more, after approximately 200 days ● Innovation: Cuprochlor-TⓇ Industrial-sized leaching test of 40,000 tonne heap confirms previous test work ● Potential to unlock value from previously uneconomic mineral resources Being considering for use at existing operations Antofagasta plc | 2022 BMO Global Metals & Mining Conference 14

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