Ms. Meredith Eades reports

STUHINI REPORTS STRONG METALLURGICAL RECOVERIES FROM SURFACE MINI-BULK SAMPLE AT SILVER SURPRISE ZONE, RUBY CREEK PROJECT

Stuhini Exploration Ltd. has released highly favourable metallurgical test results from a 1,585-pound (719-kilogram) surface mini-bulk sample collected in September, 2025, from the Silver Surprise zone at its 100-per-cent-owned Ruby Creek project, located 20 kilometres east of Atlin, B.C.

"With multiple high-grade surface samples, the Silver Surprise zone has always stood out as one of the most intriguing areas on the property," said Meredith Eades, president and chief executive officer. "We're very pleased to see the metallurgical results confirm 95-per-cent silver recovery from a 1,585-pound surface mini-bulk sample via direct smelting with a grade of 4,200 g/t silver. At a time when global demand for silver continues to rise -- driven by investment interest and industrial uses like solar, electronics and electrification -- this is a significant strategic advantage."

Key highlights:

• 1,585-pound (719-kilogram) surface mini-bulk sample with a grade of 4,200 grams per tonne silver (0.42 per cent Ag), confirming very high-grade silver mineralization exposed at surface;
• Gravity separation using a single pass on a Gemini shaking table recovered 15 per cent of the contained silver and produced a 445-gram (14.3-troy-ounce) refined silver bar;
• Direct smelting test achieved 95-per-cent silver recovery;
• Tailings after gravity separation assayed 3,540 g/t silver.

Why these results are significant:

• The 15-per-cent gravity recovery was achieved with a single, simple shaking-table pass -- no chemicals and no reprocessing of tailings. For coarse, native-silver-rich mineralization, this is a strong initial result, and confirms a large portion of the silver is free and heavy.
• More importantly, a separate direct-smelting test on the same material (crushed rock fed straight to a furnace) recovered 95 per cent of the silver without any gravity preconcentration or chemical reagents.
• Direct smelting at 95-per-cent recovery is the standout outcome and could be a preferred processing route for this style of ultrahigh-grade, quartz-hosted silver mineralization.

Metallurgical summary

The 1,585-pound (719-kilogram) mini-bulk sample was collected by hand from multiple exposed quartz-sulphide veins and processed under the direction of metallurgist Rino Mihoc of Ruby Gold Ltd. The sample was milled in a three-foot-by-three-foot Denver ball mill to 80 per cent passing 50 mesh and concentrated on a six-foot-by-four-foot Gemini gravity concentrating table. The resulting concentrate from a single pass on the gravity table graded approximately 10 per cent silver at a recovery rate of 15 per cent. This concentrate was smelted and refined into a 445-gram silver bar.

A separate direct-smelting test on a representative subsample returned 95-per-cent silver recovery without chemical reagents or flotation. The high native silver content and simple quartz-hosted mineralogy make the mineralization particularly well suited to this low-complexity processing route.

Next steps

The Silver Surprise zone remains open along strike in both directions and at depth. The company is planning follow-up prospecting and sampling in 2026 to potentially extend the zone at surface. A larger bulk sample or drilling program is also possible in 2026, subject to permitting.

Silver Surprise zone -- description and known extent

The Silver Surprise zone hosts the highest silver grades identified to date on the Ruby Creek property. Previous surface grab sampling returned 28 samples assaying between 1,000 g/t and 16,030 g/t silver, including four samples over 10,000 g/t silver (16,030 g/t Ag, 14,179 g/t Ag, 12,980 g/t Ag and 12,294 g/t Ag). Visible native silver is common throughout the zone.

Mineralization occurs in at least three parallel, subvertical quartz-sulphide veins and vein-breccias hosted in granodiorite of the late Cretaceous Surprise Lake batholith. Individual veins are approximately one metre wide and currently exposed at surface semi-continuously over strike lengths of 180 m, 50 m and 30 m, respectively, before passing beneath talus cover. The veins strike approximately 220 degrees (southwest), lie within the broader Adera structural corridor, and remain open along strike in both directions and at depth.

Numerous high-grade silver float boulders have been found uphill from the known exposures, indicating excellent potential for additional parallel veins or upslope extensions concealed beneath the talus.

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.

About the Ruby Creek project

The 29,734-hectare, road-accessible Ruby Creek project is located 20 kilometres east of Atlin, B.C. The property hosts the Ruby Creek molybdenum deposit containing a measured and indicated pit-constrained resource of 433 million pounds of molybdenum (March 15, 2022), as well as 48 documented mineral occurrences including 16 gold-related showings and seven significant placer creeks.

In addition to the high-grade Silver Surprise zone, Stuhini has identified three other priority silver targets -- Daybreak, Adera and Ruffner -- together forming a cluster of silver prospects surrounding and along trend from the molybdenum deposit. Anomalous tungsten and antimony mineralization further enhance the critical mineral potential of the tenure. This combination of a large, permitted-scale molybdenum resource surrounded by multiple high-grade silver and critical metal targets sets Ruby Creek apart as a rare multicommodity opportunity in Western Canada.

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.; the Big Ledge property, 57 km south of Revelstoke, B.C.

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