Selkirk Copper Announces Filing of NI 43-101 Technical Report for the Updated Minto Project Mineral Resource Estimate

Selkirk Copper Mines Inc. (TSXV: SCMI) (FSE: IO20) (OTCQX: SKRKF) (" Selkirk Copper " or the " Company ") is pleased to announce that it has filed on SEDAR+ the independent technical report (the "Report") prepared in accordance with National Instrument 43-101 supporting the updated Mineral Resource Estimate for its 100%-owned Minto Project in Yukon, Canada. There are no material differences in the Report from the results disclosed in the Company's news release dated July 30, 2026. The Mineral Resource Estimate has an effective date of June 10, 2026, and is reported using the 2014 CIM Definition Standards and were estimated using the 2019 CIM Best Practices Guidelines. The Report is titled "NI 43-101 2026 Mineral Resource Estimate Update for the Minto Property, Yukon, Canada" and was prepared by Moose Mountain Technical Services and Fuse Advisors (part of SLR). The Report can be found under the Company's issuer profile on SEDAR+ ( www.sedarplus.ca ) as well as the Company's website.

Technical aspects of this news release have been reviewed, verified and approved by Leif Bailey, P.Geo., Director of Geoscience & Exploration of Selkirk Copper Mines Inc., who is a qualified person as defined by National Instrument 43-101 - Standards of Disclosure for Mineral Projects.

Selkirk First Nation is centered in Pelly Crossing, a community in central Yukon, 280 km north of Whitehorse. They are a self-governing First Nation, having signed its Final and Self-Government Agreements in 1997. Selkirk First Nation owns 4,740 square kilometers of Settlement Land, including 2,408 square kilometers where they own both the surface and subsurface. Selkirk First Nation is one of three self-governing Northern Tutchone First Nations in the Yukon. The Selkirk First Nation, indirectly, holds a controlling equity stake in Selkirk Copper.

Selkirk Copper is a well-financed, newly formed company with a controlling interest held by the Selkirk First Nation through its wholly owned subsidiary, that, in partnership with the Selkirk First Nation, is completing a thorough exploration drilling campaign and a restart and redevelopment plan for the former Minto copper-gold-silver mine based on best-in-class environmentally sustainable mining, development and reclamation practice. Selkirk Copper controls 26,850 hectares of prospective mineral claims located in the Minto-Carmacks copper belt as well as significant open-pit and underground infrastructure, a 4,100 tonne per day processing plant, 400-person full-rotation camp, water treatment facilities, numerous ancillary buildings, and mobile equipment centered on the former Minto copper-gold-silver mine. Selkirk Copper's mineral tenure, operation infrastructure, access roads and powerline, is located on or adjacent to Lands of the Selkirk First Nation much of which is surrounded by prospective Selkirk First Nation Category A Lands.

Selkirk Copper Mines Inc. is listed on the TSX Venture Exchange under the symbol (TSXV: SCMI) , has a secondary listing on the Frankfurt Exchange under the symbol (FSE: IO20) , and its common shares trade under the symbol (OTCQX: SKRKF) on the OTCQX® Best Market, a U.S. marketplace operated by OTC Markets Group Inc.

On behalf of the Board of Directors of Selkirk Copper Mines Inc.

M. Colin Joudrie

President and Chief Executive Officer

For more information, please contact :

M. Colin Joudrie, President & CEO

[email protected]

(604) 760-3157

Justin Stevens, Vice-President Corporate Development

[email protected]

(604) 240-2959