Mr. Daniel Sampieri reports

CAPSTONE COPPER SUBMITS ENVIRONMENTAL PERMIT FOR MANTOS BLANCOS PHASE II

Capstone Copper Corp. today submitted the Mantos Blancos phase II 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 prefeasibility study outlining further project details during the third quarter of 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 is an Americas-focused copper mining company headquartered in Vancouver. Capstone's operating portfolio of assets includes the Pinto Valley copper mine located in Arizona, 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.

We seek Safe Harbor.