Mr. M. Colin Joudrie reports

SELKIRK COPPER ANNOUNCES FILING OF NI 43-101 PRELIMINARY ECONOMIC ASSESSMENT TECHNICAL REPORT FOR THE MINTO PROJECT

Selkirk Copper Mines Inc. has filed on SEDAR+ the independent technical report supporting the preliminary economic assessment for its 100-per-cent-owned Minto project in Yukon, Canada. The preliminary economic assessment technical report has an effective date of Sept. 21, 2026, and was prepared in accordance with the Canadian Securities Administrators' National Instrument 43-101 (Standards of Disclosure for Mineral Projects). There are no material differences in the report from the results disclosed in the company's news release dated Sept. 22, 2026. The report is titled "Minto Project, Yukon, Canada, Preliminary Economic Assessment, National Instrument 43-101 Technical Report," and was prepared by Hatch Ltd., with input from Ensero Solutions, ERM Consultants Canada Ltd., Fuse Advisors (part of SLR), Moose Mountain Technical Services and SRK Consulting (Canada) Inc. The report can be found under the company's issuer profile on SEDAR+, as well as the company's website.

Qualified person

Technical aspects of this news release have been reviewed, verified and approved by Scott Fulton, PEng, vice-president of engineering and projects of Selkirk Copper, who is a qualified person as defined by National Instrument 43-101 (Standards of Disclosure for Mineral Projects).

About Selkirk Copper Mines Inc.

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, a 400-person full-rotation camp, water treatment facilities, numerous ancillary buildings, and mobile equipment centred on the former Minto copper-gold-silver mine. Selkirk Copper's mineral tenure, operation infrastructure, access roads and power line are located on or adjacent to lands of the Selkirk First Nation, much of which are surrounded by prospective Selkirk First Nation Category A lands.

Selkirk Copper is listed on the TSX Venture Exchange under the symbol TSX Venture Exchange and has a secondary listing on the Frankfurt exchange under the symbol IO20, and its common shares trade under the symbol OTCQX on the OTCQX Best Market, a U.S. marketplace operated by OTC Markets Group Inc.

We seek Safe Harbor.