Stuhini Exploration Reports Strong Metallurgical Recoveries from Surface Mini-Bulk Sample at Silver Surprise Zone, Ruby Creek Project
Sample Collection & Context
In September 2025, Stuhini extracted a 1,585-pound (719 kg) surface “mini-bulk” sample from Silver Surprise Zone, located roughly 20 km east of Atlin, British Columbia.
The sampling was done by hand over a two-day period along one of the quartz-sulphide veins that characterize the zone.
This step was aimed at confirming whether the high-grade silver mineralization previously seen in small grab samples extends at bulk scale, and to test metallurgical recoverability under realistic processing conditions.
Assay Results — Very High-Grade Silver
Assays from the mini-bulk sample returned an exceptional grade of ≈ 4,200 g/t silver (roughly 0.42% Ag), underlining that the surface material at Silver Surprise is ultra-high-grade.
This confirms that the silver-rich veins observed at surface — previously sampled via small grab samples — are not just isolated “pockets,” but reflect robust and extensive mineralization, at least locally.
Metallurgical Testing — Processing Results
Once collected, the sample was milled and tested via two processing routes.
Using a simple gravity separation on a shaking (Gemini) table, a single pass recovered about 15% of the contained silver, yielding a 445-gram (14.3 troy ounce) refined silver bar.
More significantly, a direct-smelting test on crushed rock — with no chemicals or flotation — achieved a 95% silver recovery, indicating that the silver occurs in a form (likely coarse or native) that is highly amenable to low-complexity processing.
Geological & Mineralization Context of Silver Surprise Zone
The Silver Surprise Zone lies within a cluster of silver- and base-metal targets on the Ruby Creek property, hosted by quartz-sulphide veins/vein-breccias in granodiorite of the Surprise Lake Batholith.
Historically, grab and talus sampling from the zone yielded 28 samples assaying between 1,000 and 16,030 g/t silver, including several above 10,000 g/t — underscoring an exceptionally rich silver-bearing system.
Individual veins within the zone are roughly 1 metre wide and exposed over strike lengths of ~180 m, 50 m, and 30 m before disappearing under talus — with structural and geological data suggesting the zone remains open along strike and at depth, implying good potential for extension.
What This Means — Potential & Next Steps
The combination of ultra-high silver grades and excellent recoveries (95% via direct smelting) demonstrates that the mineralization at Silver Surprise is likely both economically meaningful and technically exploitable with simple processing methods.
Given these results, the zone becomes a compelling candidate for a larger bulk sample — or even a future drilling program, to better define the extent and continuity of the mineralization.
Stuhini has indicated plans for follow-up prospecting and sampling in 2026. If further work confirms continuity, this could materially enhance the value of the Ruby Creek Project, which already hosts a substantial molybdenum deposit, making Ruby Creek a diverse, multi-commodity asset.
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