Capstone Copper Increases Revolving Credit Facility and Extends Maturity to May 2029

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All amounts in US$ unless otherwise indicated

VANCOUVER, British Columbia, May 06, 2025--(BUSINESS WIRE)--Capstone Copper Corp. ("Capstone" or the "Company") (TSX:CS) (ASX; CSC) is pleased to announce that it has amended its existing revolving credit facility (the "Amended Credit Facility") and extended the maturity from September 2027 to May 2029. The Amended Credit Facility will bear interest on a sliding scale of adjusted term SOFR plus a margin of 1.75% to 2.75%.

The amendment of the existing revolving credit facility increases the aggregate commitments from $700 million to $1 billion, with a $200 million accordion. Increased availability of the revolving credit facility is subject to refinancing of the Company’s Mantoverde Development Project Facility. As part of the balance sheet optimization, Capstone intends to repay its 70%-attributable share of project financing debt at the Mantoverde S.A. subsidiary using proceeds from the previously announced $600 million aggregate principal amount of 6.750% senior unsecured notes due 2033.

"This represents a further step towards enhancing our balance sheet strength and flexibility. We are pleased to have achieved competitive terms and an extended maturity to 2029 on our revolving credit facility. When combined with the new senior unsecured notes announced in March, in addition to the anticipated repayment of our share of the Mantoverde Development Project Facility, we have a simplified debt capital structure with our only material debt maturities in 2029 and 2033," stated Raman Randhawa, Chief Financial Officer.

The Amended Credit Facility includes standard and customary terms and conditions with respect to fees, representations, warranties, and financial covenants. CIBC acted as Administrative Agent, Joint Bookrunner, and Co-Lead Arranger. The Bank of Nova Scotia acted as Syndication Agent, Joint Bookrunner, and Co-Lead Arranger. ING Capital LLC acted as the Joint Bookrunner and Co-Lead Arranger.

A copy of the Amended Credit Facility agreement will be filed on SEDAR+.

About Capstone Copper Corp.

Capstone Copper Corp. is an Americas-focused copper mining company headquartered in Vancouver, Canada. We own and operate 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 70% of the Mantoverde copper-gold mine, located in the Atacama region, Chile. In addition, we own the fully permitted Santo Domingo copper-iron-gold project, located approximately 30 kilometres northeast of Mantoverde in the Atacama region, Chile, as well as a portfolio of exploration properties in the Americas.