Stuhini identifies copper-gold target at Ruby Creek

Ms. Meredith Eades reports STUHINI IDENTIFIES HIGH-GRADE COPPER-GOLD PORPHYRY TARGET AT RUBY CREEK PROJECT, BC Stuhini Exploration Ltd. has identified a potential new copper-gold porphyry target at its 100-per-cent-owned Ruby Creek project, located near Atlin, B.C. "These are the kinds of early-stage results that can generate real excitement," said Meredith Eades, president and chief executive officer of Stuhini. "With high-grade silver at Silver Surprise (where a mini-bulk sample has been completed and metallurgical results are pending), a molybdenum deposit now undergoing initial economic evaluation, and a newly discovered potential copper-gold porphyry target emerging in the region of the historic and past-producing Atlin Ruffner silver mine, the scale and diversity of these newly discovered prospects across the Stuhini-owned Ruby Creek mineral claims are becoming increasingly exciting. Our goal is to advance both development and discovery in parallel, positioning Stuhini as a compelling multimetal story with near-term catalysts and long-term growth potential." Highlights: Eleven grab outcrop and talus samples returned greater than 0.5 per cent copper, with assays up to 8.1 per cent Cu; Gold values include 13.0 grams per tonne gold from outcrop and 36.8 g/t Au from talus float; Geological similarities to the host rock of the adjacent Ruby Creek molybdenum deposit; Magnetic data suggest the mineralized porphyry may span approximately one kilometre by 600 metres; Additional assays and petrographic analysis are pending. Fieldwork during the 2025 exploration season uncovered a 400-metre-wide discontinuous exposure of feldspar-phyric porphyry in the Ruffner area, which returned numerous high-grade copper and gold assays. The porphyry exhibits classic alteration signatures consistent with a copper porphyry system, including phyllic (quartz-sericite-pyrite) and propylitic (chlorite-epidote-carbonate) alteration. The new target is located approximately 3.6 kilometres from the company's flagship Ruby Creek molybdenum deposit and adds to a growing pipeline of multimetal targets across the 29,734-hectare project. Two paths to value -- development and discovery The Ruby Creek project is underpinned by the Surprise Lake batholith -- an expansive Cretaceous intrusive system in northwestern British Columbia that hosts multiple styles of mineralization including porphyry-moly, skarn, epithermal and intrusion-related gold systems. Spanning approximately 1,100 square kilometres, this batholith hosts an exceptional array of porphyry, skarn, mesothermal and intrusion-related gold systems. Unlike the Golden Triangle -- known for its size and output -- Surprise Lake is distinguished by its metal diversity, generated from interpreted multiple magmatic events. This makes it a rare and highly prospective setting for multimetal discovery. Recognizing this opportunity, Stuhini is advancing a two-pronged strategy to unlock value at Ruby Creek. 1. Development track The company has engaged Tetra Tech to complete a conceptual-level economic study of its 433-million-pound molybdenum deposit. This initiative builds on approximately 74,000 metres of historical drilling and a 2006 feasibility study, and is intended to assess the potential for an updated preliminary economic assessment, providing an informed basis for next steps in advancing the project. 2. Exploration track In parallel, Stuhini is actively advancing a pipeline of high-impact exploration targets across its 29,734-hectare land package, including: Silver Surprise zone: High-grade silver samples up to 16,030 g/t Ag have been confirmed at surface. A recent mini-bulk sample has been completed, with metallurgical results pending*. Ruffner copper-gold porphyry: During the 2025 field season, fieldwork collected several grab samples that assayed up to 8.1 per cent Cu and 36.8 g/t Au, coupled with mapping and magnetics surveys suggesting a buried approximately one kilometre-by-600-metre copper-gold porphyry target, to be followed up in 2026*. Additional zones: Several other targets across the project are being refined through continuing historical data compilation, geophysics and fieldwork. Assay results from the 2025 field season are pending and expected to further inform the target ranking of future drill targets. * The potential quantity and grade of the aforementioned targets are conceptual in nature, there has been insufficient exploration to define a mineral resource, and it is uncertain if further exploration will result in the target being delineated as a mineral resource. By advancing both tracks concurrently, Stuhini aims to deliver meaningful near-term catalysts while building long-term value in one of British Columbia's most prospective multimetal systems. Qualified person Nicholas Clive Aspinall, MSc, PEng, is a consulting geologist to Stuhini Exploration and is a qualified person as defined by National Instrument 43-101. Mr. Aspinall has verified the data disclosed in this press release, including the sampling, analytical and test data underlying the technical information, and has approved the technical information contained herein. Quality assurance/quality control protocol: Rock material was collected in poly bags and then transported to the Bureau Veritas sample preparation facility located in Whitehorse, Yukon. Samples were crushed, and then pulps were sent to the Bureau Veritas lab in Vancouver for assay. A 30-gram sample was digested by modified aqua regia digestion with ultratrace ICP-MS analysis for 65 elements. Samples suspected of containing native gold were additionally analyzed using fire assay utilizing metallic screen to 106 micrometres, and an approximately 25-gram sample of the plus fraction is analyzed as well as a duplicate of minus fraction. Overlimit copper, lead, zinc, tungsten and silver samples were analyzed by multiacid digestion and ICP-ES (MA370). Overlimit silver samples greater than 1,500 g/t were also analyzed by fire assay (FA530) and lead samples greater than 10 per cent with titration (GC817). Overlimit tungsten greater than 1 per cent was analyzed with lithium borate fusion XRF (XF750). All results have passed the QA/QC screening by the lab. About the Ruby Creek project The 29,734-hectare Ruby Creek project is road accessible and located 14 kilometres east of Atlin, B.C. There are 48 different documented mineral occurrences on the property, of which 16 are gold related, with seven significant gold placer creeks. The property also hosts the Ruby Creek molybdenum deposit, which hosts a measured and indicated pit-constrained resource of 433 million pounds molybdenum using $15 (U.S.) per lb molybdenum prices and a 0.02-per-cent cut-off grade. (See news release dated March 15, 2022.) Stuhini owns 100 per cent of the Ruby Creek project. About Stuhini Exploration Ltd. Stuhini is a mineral exploration company focused on exploration and development of precious and base metal properties in Western Canada. The company's portfolio of exploration properties includes the flagship Ruby Creek property, 16 km east of Atlin, B.C.; and the Big Ledge property, 57 km south of Revelstoke, B.C. We seek Safe Harbor.