Capstone Copper Publishes 2025 Sustainability Report

About this update from Capstone Copper Corp.

Capstone Copper Corp. (“Capstone” or the “Company”) (TSX:CS) (ASX:CSC) is pleased to announce that it has published its 2025 Sustainability Report (the “Sustainability Report” or the “Report”). The Report has been prepared in accordance with the Global Reporting Initiative (“GRI”) Standards, Sector Standard GRI 14: Mining Sector 2024, and the SASB Metals & Mining Sustainability Accounting Standard. The Report details the Company’s performance on material sustainability topics across its operations for the period from January 1 to December 31, 2025. Cashel Meagher, President and CEO of Capstone, commented, “I am pleased to share Capstone Copper’s 2025 Sustainability Report, which reflects how we continued to embed our Sustainable Development Strategy throughout our business. 2025 was a year of meaningful progress made possible by our team and guided by our commitment to being prudent in thought and reliable in action. We continued to build a culture grounded in safety, accountability and disciplined execution, all while delivering production growth to meet the increasing demand for copper, the key metal for electrification. Looking towards the future, sustainability remains inseparable from our business strategy as we aim to create lasting value for shareholders while contributing positively to our people, the environment and our operating communities.” 2025 Sustainability Report Highlights Throughout 2025, we advanced our Sustainable Development Strategy across our five priority areas: Climate, Water, Tailings, Biodiversity and Communities. We worked collaboratively across the company to achieve sustainability milestones on multiple fronts, highlighted below: Improved health and safety performance through our Health, Safety, and Environment (HSE) Roadmap: 2025 marked the first year of our three-year “CuSafe” HSE Roadmap. Improved leadership training, system implementation and standardized processes resulted in meaningful progress on safety metrics, including a ~22% reduction in recordable injuries year-over-year. Full participation in The Copper Mark Assurance Process across all sites: Pinto Valley received The Copper Mark award in 2025, joining Mantos Blancos and Mantoverde which received the award in 2023, and started the second cycle of the assurance process in 2025. Cozamin also commenced the assurance process in 2025, extending our commitment to ...

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