Southern Copper — Oct 28, 2025 release

El Arco - Baja California: This is a world-class copper deposit located in the central part of the Baja California peninsula with more than 1,230 million tonnes in sulphide ore reserves with an average ore grade of 0.40% and 141 million tonnes of leach material with an average ore grade of 0.27%. The project includes an open-pit mine with a combined 120 ktpd concentrator and 28 ktpy SX-EW operations. Detailed engineering is still underway for the concentrator, SX-EW plant, water desalination, logistics infrastructure and power delivery. ​ ​ 3Q25       www.southerncoppercorp.com Page 4 of 12 ​ ​ ​ ​ ​ ​ ​ ​ ​ THIRD QUARTER AND NINE MONTHS 2025 RESULTS SOUTHERN COPPER ​ ​ ​ ​ Environmental, Social & Corporate Governance (ESG) Practices Our sustainability ratings are on the rise. In its Corporate Sustainability Assessment 2025, S&P Global increased SCC’s rating by 4 points over last year’s print. This result positions the company among the leaders in the mining sector’s performance ranking, with a rating that is more than twice the industry’s average. Some of SCC’s disaggregated ratings were the highest reported for the sector: i) transparency and reporting, ii) environmental management, iii) biodiversity, iv) cybersecurity, v) labor practices, vi) human rights and vii) community relations. We prevent greenhouse gas emissions at our operations. The electricity our underground mines has received from the Fenicias wind farm has enabled us to curb greenhouse gas emissions by 180 thousand carbon tons thus far in 2025, which is equivalent to the electricity supply needed to sustain 4