Selkirk Copper Files Minto PEA Technical Report With No Material Changes to September Results

Selkirk Copper Mines has filed an independent NI 43-101 technical report on SEDAR+ supporting the preliminary economic assessment (PEA) for its 100%-owned Minto Project in Yukon, Canada. The report is dated September 21, 2026, and contains no material differences from the results the company disclosed on September 22, 2026. Hatch Ltd. prepared the report with input from 5 additional consulting firms.

Company Overview

Selkirk Copper is a newly formed company in which the Selkirk First Nation holds a controlling interest through a wholly owned subsidiary. In partnership with the Selkirk First Nation, the company is completing an exploration drilling campaign and a restart and redevelopment plan for the former Minto copper-gold-silver mine. Selkirk Copper controls 26,850 hectares of mineral claims in the Minto-Carmacks copper belt, along with open-pit and underground infrastructure, a 4,100-tonne-per-day processing plant, a 400-person full-rotation camp, water treatment facilities, ancillary buildings and mobile equipment. Its mineral tenure, infrastructure, access roads and powerline lie on or adjacent to Selkirk First Nation lands. The Selkirk First Nation is a self-governing Northern Tutchone First Nation centered in Pelly Crossing, 280 kilometers north of Whitehorse, and owns 4,740 square kilometers of Settlement Land.

Preliminary Economic Assessment Technical Report Filed on SEDAR+

Selkirk Copper Mines (TSXV: SCMI | FRA: IO20 | OTCQX: SKRKF) announced on November 5, 2026, that it has filed the technical report supporting the preliminary economic assessment (PEA) for the Minto Project. The document, titled "Minto Project, Yukon, Canada, Preliminary Economic Assessment National Instrument 43-101 Technical Report," was prepared in accordance with NI 43-101 and carries an effective date of September 21, 2026.

The filed report contains no material differences from the PEA results Selkirk Copper published in its September 22, 2026 news release. The full report is available under the company's issuer profile on SEDAR+ and on the Selkirk Copper website.

Hatch Prepared the Report With Input From 5 Consultants

Hatch Ltd. led the report's preparation, with input from Ensero Solutions, ERM Consultants Canada Ltd., Fuse Advisors (part of SLR), Moose Mountain Technical Services, and SRK Consulting (Canada) Inc.

Scott Fulton, P.Eng., Vice President of Engineering & Projects at Selkirk Copper and a qualified person as defined by NI 43-101, reviewed, verified and approved the technical aspects of the announcement.

Next Steps

Selkirk Copper is targeting completion of the remainder of its drill program at Minto, with results to be integrated into ongoing studies and used to support an FS. The company is also targeting an updated PEA based on its mineral resource estimate (MRE), along with an updated mine plan and targeted mine life.