Selkirk Copper Mines Inc. has filed an independent National Instrument 43-101 technical report on SEDAR+ supporting the updated mineral resource estimate for its 100%-owned Minto Project in the Yukon, Canada.

The filing formalises the resource figures previously disclosed on July 30, 2026, confirming that the technical report contains no material differences from those earlier results. Moose Mountain Technical Services and Fuse Advisors, operating as part of SLR, prepared the documentation under the title "NI 43-101 2026 Mineral Resource Estimate Update for the Minto Property, Yukon, Canada". The estimate has an effective date of June 10, 2026, and was prepared using 2014 CIM Definition Standards and 2019 CIM Best Practices Guidelines. Leif Bailey, P.Geo., Director of Geoscience & Exploration for Selkirk Copper, served as the qualified person who approved the technical aspects.

The July 30, 2026 resource update established a Measured and Indicated resource of 47.8 million tonnes at 0.89% copper, 0.34 g/t gold, and 3.2 g/t silver — a 280% increase in tonnage versus the 2025 estimate. That inventory totals 940 million pounds of copper, 530,000 ounces of gold, and 4.97 million ounces of silver, comprising 26.0 million tonnes of underground resources at 1.14% copper, 0.49 g/t gold, and 4.4 g/t silver alongside 21.8 million tonnes of open pit resources at 0.59% copper, 0.17 g/t gold, and 1.8 g/t silver. An additional 16.9 million tonnes of Inferred resources were delineated at 0.76% copper, 0.26 g/t gold, and 2.7 g/t silver, containing 281 million pounds of copper, 142,000 ounces of gold, and 1.5 million ounces of silver.

Selkirk Copper controls 26,850 hectares across the Minto-Carmacks copper belt. The property hosts extensive open-pit and underground infrastructure, a 4,100 tonne per day processing plant, a 400-person camp, water treatment facilities, and mobile equipment centered on the former Minto mine.

The updated mineral resource estimate is currently being utilised to develop an updated preliminary economic assessment to refine mine planning and operational parameters. Meanwhile, a separate scoping study evaluating critical mineral concentrate shipping options through the Port of Skagway is scheduled for completion in September 2026. That study follows a funding agreement established with the Municipality of Skagway Borough, with Selkirk Copper providing up to US$200,000 to establish a sustainable shipping methodology meeting local standards and future transport requirements.

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