Arizona Sonoran Provides Update on Nuton Option to Joint Venture

Casa Grande, Ariz. & Toronto, Dec 30  — Arizona Sonoran Copper Company Inc. (TSX:ASCU | OTCQX:ASCUF) (“ASCU” or the “Company”) today announces that, following preliminary consultation, the Company and Nuton LLC (“Nuton”), a Rio Tinto Venture, have mutually agreed to commence discussions in January with respect to an amicable early termination of the option to joint venture agreement on the Cactus Project.

The Company will continue to advance its Cactus Project on a standalone basis. Following from the recently completed positive standalone Pre-Feasibility Study, the Company will continue to progress the standalone Definitive Feasibility Study on the Cactus Project, targeted for completion in 2H 2026, with a view to an eventual final investment decision as early as 4Q 2026, alongside its ongoing advancement of related permitting amendments, project financing work, and various early development activities to be defined and actioned in the new year.

The Company does not intend to provide any further updates regarding its discussions with Nuton until there is a definitive update. There is no certainty as to how long such negotiations will take or that any definitive outcome will result, or that any such or other outcome will be on terms mutually satisfactory to the parties.

Neither the Toronto Stock Exchange nor the regulating authority has approved or disproved the information contained in this press release.