Capstone Copper Submits Environmental Permit for Mantos Blancos Phase II

About this update from Capstone Copper Corp.

VANCOUVER, British Columbia, June 19, 2026--(BUSINESS WIRE)--Capstone Copper Corp. ("Capstone" or the "Company") (TSX:CS) (ASX:CSC) today submitted the Mantos Blancos Phase II Project (the "Project") to the Environmental Impact Assessment ("EIA") process. The Project represents the next phase of growth and supports the long-term operational continuity of the Mantos Blancos mine in Antofagasta, Chile. Project Details Mantos Blancos Phase II contemplates an expansion of the sulphide concentrator plant throughput capacity to at least 27,000 ore tonnes per day ("tpd"), from the current design throughput capacity of 20,000 tpd. The expansion considers new equipment for concentrate filtration, thickening and filtering of tailings, as well as upgrades to existing process operations. In addition, the Project supports future operations of Mantos Blancos by contemplating the construction and operation of a new in-pit tailings storage facility beyond 2030 while strengthening environmental management of the operation's existing baseline conditions. The submission of the full EIA permit application for the Project is expected to be followed by the release of a pre-feasibility study outlining further project details during Q3 2026. Following receipt of environmental approvals and sectoral permits, as well as approximately one year of construction, expanded production is expected to commence between 2030 and 2031. About Capstone Copper Corp. Capstone Copper Corp. is an Americas-focused copper mining company headquartered in Vancouver, Canada. Capstone’s operating portfolio of assets includes the Pinto Valley copper mine located in Arizona, USA, the Cozamin copper-silver mine located in Zacatecas, Mexico, the Mantos Blancos copper-silver mine located in the Antofagasta region, Chile, and the Mantoverde copper-gold mine, located in the Atacama region, Chile. Capstone’s growth pipeline includes the fully permitted Santo Domingo copper-iron-gold project, located approximately 35 kilometres northeast of Mantoverde in the Atacama region, Chile, as well as a portfolio of exploration properties in the Americas. Capstone Copper’s strategy is to unlock transformational copper production growth while executing on cost and operational improvements through innovation, optimization and safe and responsible production throughout ou...

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