Antofagasta Investor Day

OPERATING MODEL Successfully embedded across our operations Main Milestones • Operating Model embedded, defining roles, responsibilities and routines Operational Excellence standard with 5 steps to identify, deploy, execute and lock-in the value of the improvements Annual initiatives portfolio focused on variability reduction of main performance drivers • Lean Management Practices applied 80% 75% 70% 65% 60% 72% 2018 2019 Stacked Material at Antucoya (ktpa) Effective Truck Utilisation at Los Pelambres (%) +3ppt 75% 5.600 YTD 2021 5.400 5.200 76% 73% ||||| 2020 5.000 4.800 77% 4,988 2018 5,081 Full Potential Annual Avg. 2019 +7% 5,287 2020 5,323 5,300 YTD 2021 Full Potential ANTOFAGASTA PLC

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