Antofagasta Results Presentation Deck

Balance sheet Net cash / (debt) and Net debt/EBITDA ratio $ million and times 1 2 $34m 0.23x ratio ¹ 2,647 (216) $(563) m Net cash (debt) - Net cash EBITDA from Working ex sub debt² (debt) subsidiaries capital 1 Jan 2020 1 Jan 2020 Net debt/EBITDA ratio Subordinated debt: $394 million end 2020, $598 million end 2019 (320) Tax $481m (1,307) Capex (40) (81) 210 (411) Net interest Others and Subordinated Dividends non-cash debt movements conversion 0.03x ratio¹ $(82) m Net cash (debt) 31 Dec 2020 ANTOFAGASTA PLC $312m Net cash (debt) - ex sub debt² 31 Dec 2020 15

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