Stuhini Reports Strong Metallurgical Recoveries from Surface Mini-Bulk Sample at Silver Surprise Zone, Ruby Creek Project

Rhea-AI Summary

Stuhini (OTCQB: STXPF) reported metallurgical results from a 1,585 lb (719 kg) surface mini-bulk sample collected September 2025 from the Silver Surprise Zone at Ruby Creek.

Key outcomes: 4,200 g/t Ag head grade, 15% silver recovery from a single-pass gravity table (producing a 445 g refined silver bar) and a separate 95% silver recovery via direct smelting without chemicals. Tailings after gravity separation assayed 3,540 g/t Ag. The zone remains open along strike and at depth with follow-up work and possible larger bulk sampling or drilling planned for 2026, subject to permitting.

Positive

• 4,200 g/t Ag head grade from 1,585 lb mini-bulk sample
• 95% silver recovery via direct smelting without reagents
• Gravity concentrate produced a 445 g refined silver bar

Negative

• Single-pass gravity recovery was only 15%
• Results derive from one 719 kg surface mini-bulk sample, not a resource estimate

News Market Reaction

+13.85%

1 alert

+13.85% News Effect

On the day this news was published, STXPF gained 13.85%, reflecting a significant positive market reaction.

Data tracked by StockTitan Argus on the day of publication.

Key Figures

Mini-bulk sample size: 1,585 lb (719 kg) Head grade: 4,200 g/t Ag (0.42% Ag) Gravity recovery: 15% silver recovery +5 more

8 metrics

Mini-bulk sample size 1,585 lb (719 kg) Surface mini-bulk sample collected September 2025

Head grade 4,200 g/t Ag (0.42% Ag) Silver grade of surface mini-bulk sample

Gravity recovery 15% silver recovery Single-pass Gemini shaking table test

Refined silver bar 445 g (14.3 troy oz) Produced from gravity concentrate smelting

Direct smelting recovery 95% silver recovery Direct smelting test without chemical reagents

Tailings grade 3,540 g/t Ag Tailings after gravity separation

Peak grab sample grade 16,030 g/t Ag Highest silver grade from prior surface grab samples

Vein exposure length 180 m strike length Longest mapped quartz-sulphide vein at surface

Market Reality Check

Price: $0.1386 Vol: Volume 15,001 is below th...

normal vol

$0.1386 Last Close

Volume Volume 15,001 is below the 20-day average of 17,461 (relative volume 0.86). normal

Technical Current price 0.11208 is very close to the 200-day MA at 0.11, indicating trading near its long-term trend.

Historical Context

5 past events · Latest: Dec 08 (Negative)

Pattern 5 events

Date	Event	Sentiment	Move	Catalyst
Dec 08	Board transition	Negative	-5.8%	Founder and Chairman retired from the Board following the AGM.
Dec 01	Metallurgy results	Positive	+13.8%	Mini‑bulk sample showed 4,200 g/t Ag and up to 95% recovery.
Nov 04	New target identified	Positive	+5.7%	High‑grade copper‑gold porphyry target defined at Ruby Creek.
Oct 21	Economic assessment	Positive	-4.5%	Tetra Tech engaged for conceptual economic assessment of molybdenum deposit.
Oct 06	Mini bulk sampling	Positive	-2.4%	1,585‑lb mini bulk sample initiated at Silver Surprise Zone for metallurgy.

Pattern Detected

Recent news has often been met with mixed reactions: several exploration milestones saw aligned price gains, while some positive project updates experienced selloffs, suggesting a tendency for uneven responses to good news.

Recent Company History

Over the last few months, Stuhini has focused on advancing its Ruby Creek assets. On Oct 6, 2025, it completed a 1,585 lb mini bulk sample at the Silver Surprise Zone, followed by engaging Tetra Tech on Oct 21 to assess the Ruby Creek molybdenum deposit. A new high‑grade copper‑gold porphyry target was outlined on Nov 4. The December 1 metallurgical results from the Silver Surprise mini‑bulk sample then confirmed very high grades and strong recoveries, building directly on October’s sampling work. A board transition was announced on Dec 8.

Market Pulse Summary

The stock surged +13.8% in the session following this news. A strong positive reaction aligns with t...

Analysis

The stock surged +13.8% in the session following this news. A strong positive reaction aligns with the clearly favorable metallurgical data, including a head grade of 4,200 g/t Ag and 95% silver recovery via direct smelting. Historical news at Ruby Creek has sometimes produced sizeable upside moves after technical milestones, as seen on prior exploration updates. However, past instances also showed that gains were not always persistent after good news, so position sizing and attention to liquidity levels, such as average daily volume near 17,461 shares, remained important considerations.

Key Terms

gravity separation, Gemini shaking table, direct smelting, quartz-sulphide veins, +4 more

8 terms

gravity separation technical

"Gravity separation using a single pass on a Gemini shaking table"

Gravity separation is a physical mining process that uses water, air or vibration to let heavier minerals sink and lighter waste float or wash away, separating materials based on their density. Investors care because it affects how much valuable material is recovered, the capital and operating costs, and the environmental footprint of processing — all of which influence a resource project's profitability and regulatory risk.

Gemini shaking table technical

"Gravity separation using a single pass on a Gemini shaking table"

A Gemini shaking table is a type of gravity-separation machine used in mineral processing to concentrate and separate heavier ore particles from lighter waste by gently vibrating a sloped surface with riffles, so denser material slides one way while lighter material is washed away. For investors, it matters because adding or upgrading this equipment can raise recovery rates, boost production efficiency and lower processing costs—directly affecting a mining operation’s output and profitability.

direct smelting technical

"a separate direct-smelting test on the same material"

Direct smelting is a metallurgical process that converts ore or mineral concentrates straight into molten metal in a single furnace step, skipping several intermediate treatments such as roasting, sintering or pelletizing. For investors it matters because it can cut processing steps, lower operating costs and emissions, and change capital needs and production risk—think of it like cooking a meal in one pot instead of using multiple pans and stages.

quartz-sulphide veins technical

"collected by hand from multiple exposed quartz-sulphide veins"

Quartz-sulphide veins are narrow, ribbon-like fractures in rock that have been filled with quartz and sulphide minerals — the latter are mineral compounds that often contain sulfur plus metals such as gold, copper, lead or zinc. For investors, they matter because these veins can concentrate valuable metals into mineable zones, acting like visible 'wires' of ore that guide exploration, influence how a deposit is processed, and affect project economics and environmental handling.

vein-breccias technical

"quartz-sulphide veins and vein-breccias hosted in granodiorite"

Vein-breccias are sections of a mineral vein where the rock has been broken into angular fragments and then re-cemented or filled by mineral-rich fluids, often creating a patchwork of broken rock pieces glued together by ores. For investors, they matter because these chaotic, concentrated zones can contain higher-than-average concentrations of valuable metals, affect how easy or costly it is to extract ore, and influence the size and quality of a mineral deposit in exploration and resource estimates.

granodiorite technical

"veins and vein-breccias hosted in granodiorite of the Surprise Lake Batholith"

A coarse-grained, hard igneous rock similar to granite but with more plagioclase feldspar than potassium feldspar; think of it as a chunky, crystalline basement rock formed when molten magma cooled slowly underground. For investors, granodiorite matters because it often hosts or sits near valuable mineral deposits (like copper and gold) and influences how easy or costly it is to find, access and process those minerals—akin to whether treasure is buried in sand or embedded in bedrock.

batholith technical

"granodiorite of the Late Cretaceous Surprise Lake Batholith"

A batholith is a very large, deep-seated body of solidified magma—think of it as a massive, underground blob of rock that cooled slowly beneath the Earth’s surface and may become exposed over time by erosion. For investors, batholiths matter because they often host concentrations of valuable minerals (like gold, copper, or rare metals) and influence where mining, drilling, groundwater, and construction projects are viable, affecting the economic potential and risk of land-based resource investments.

National Instrument 43-101 regulatory

"a "qualified person" as defined by National Instrument 43-101"

National Instrument 43-101 is a set of rules and guidelines that govern how mineral exploration and mining companies must report information about their projects. It ensures that the details shared with investors are accurate, consistent, and reliable—similar to how a detailed, verified blueprint ensures a building’s safety. This helps investors make informed decisions based on trustworthy information about a company's mineral resources.

AI-generated analysis. Not financial advice.

Vancouver, British Columbia--(Newsfile Corp. - December 1, 2025) - Stuhini Exploration Ltd. (TSXV: STU) (OTCQB: STXPF) (WKN: A2PLBV) ("Stuhini" or the "Company") is pleased to announce highly favourable metallurgical test results from a 1585 pound (719 kg) surface mini-bulk sample collected in September 2025 from the Silver Surprise Zone at its 100%-owned Ruby Creek Project, located 20 km east of Atlin, British Columbia.

"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 CEO. "We're very pleased to see the metallurgical results confirm 95% silver recovery from a 1585 lb 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:

• 1585 lb (719 kg) surface mini-bulk sample with a grade of 4,200 g/t silver (0.42% Ag), confirming very high-grade silver mineralization exposed at surface
• Gravity separation using a single pass on a Gemini shaking table recovered 15% of the contained silver and produced a 445-gram (14.3 troy ounce) refined silver bar (Figure 1)
• Direct smelting test achieved 95% silver recovery
• Tailings after gravity separation assayed 3,540 g/t silver

Why These Results Are Significant:

• The 15% gravity recovery was achieved with a single, simple shaking-table pass — no chemicals and no re-processing 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% of the silver without any gravity pre-concentration or chemical reagents.

• Direct smelting at 95% recovery is the standout outcome and could be a preferred processing route for this style of ultra-high-grade, quartz-hosted silver mineralization.

Figure 1: 445-gram (14.3 troy ounce) refined silver bar produced from the Silver Surprise mini-bulk sample via gravity table separation.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/11821/276382_ebbd8475141669ce_002full.jpg

Metallurgical Summary:

The 1585 lb (719 kg) 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 3' x 3' Denver ball mill to 80% passing 50 mesh and concentrated on a 6' x 4' Gemini gravity concentrating table. The resulting concentrate from a single pass on the gravity table graded approximately 10% silver at a recovery rate of 15%. This concentrate was smelted and refined into a 445-gram silver bar.

A separate direct-smelting test on a representative sub-sample returned 95% 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, sub-vertical quartz-sulphide veins and vein-breccias hosted in granodiorite of the Late Cretaceous Surprise Lake Batholith. Individual veins are approximately 1 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 ~220° (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 up-slope extensions concealed beneath the talus.

Figure 2: Silver results in rock samples within the Silver Surprise Zone, showing the surface trace of the mineralized veins along with mapped fault/shear traces.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/11821/276382_ebbd8475141669ce_003full.jpg

Qualified Person

Mr. Nicholas Clive Aspinall, M.Sc., P.Eng., 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 km east of Atlin, British Columbia. 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 7 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 (Figure 3). Anomalous tungsten and antimony mineralization further enhance the critical-minerals 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 multi-commodity opportunity in western Canada.

Figure 3: Ruby Creek Project overview showing Silver Surprise, Daybreak, Adera, and Ruffner silver targets in relation to the Ruby Creek molybdenum deposit and proposed open pit.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/11821/276382_ebbd8475141669ce_004full.jpg

About Stuhini Exploration Ltd.

Stuhini is a mineral exploration company focused on exploration and development of precious and base metals properties in western Canada. The Company's portfolio of exploration properties includes the flagship Ruby Creek Property, 16 km east of Atlin, BC; the Big Ledge Property, 57 km south of Revelstoke, BC.

For further information on Stuhini, visit our website at www.stuhini.com or contact:

Meredith Eades
President & CEO
meades@stuhini.com
604.360.4668

Twitter: @STUexploration
LinkedIn: Stuhini Exploration

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Forward-Looking Statements

This news release contains "forward-looking statements" and "forward-looking information" (collectively, "forward-looking statements") within the meaning of applicable Canadian securities laws. All statements in this release that are not historical facts are forward-looking statements, including, without limitation: statements regarding the interpretation of metallurgical test results from the Silver Surprise Zone; the proposed 2026 exploration program, including channel sampling, mapping, larger-scale bulk sampling, or drilling; and the broader development and exploration potential of the Ruby Creek Project.

Forward-looking statements are based on a number of assumptions believed by the Company to be reasonable at the time of preparation. These include, but are not limited to: the accuracy and representativeness of the bulk sample; that laboratory results and metallurgical recoveries reflect field-scale conditions; that permitting and logistical conditions will allow for follow-up work; that commodity prices and capital markets will remain supportive; and that the Company will have continued access to financing, technical expertise, and regulatory approvals.

Forward-looking statements involve known and unknown risks, uncertainties, and other factors that may cause actual results to differ materially from those expressed or implied. These risks include, but are not limited to: the possibility that bulk sample results may not be representative of the broader zone; changes in silver prices or market sentiment; exploration or operational challenges; delays in permitting or field access; and broader economic, environmental, or geopolitical disruptions.

Although Stuhini believes that the expectations reflected in these forward-looking statements are reasonable, it can give no assurance they will prove to be correct. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this news release. The Company undertakes no obligation to update or revise any forward-looking statements, except as required by law.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/276382

FAQ

What metallurgical recoveries did Stuhini (STXPF) report from the Silver Surprise mini-bulk sample on December 1, 2025?

Stuhini reported 15% recovery from a single-pass gravity table and 95% recovery from a separate direct-smelting test.

What was the silver grade of the 1,585 lb mini-bulk sample at Ruby Creek (OTCQB: STXPF)?

The mini-bulk sample assayed 4,200 g/t Ag (0.42% Ag).

How much refined silver did the gravity concentrate produce from Stuhini's Silver Surprise sample?

The gravity concentrate was smelted and refined into a 445-gram (14.3 troy ounce) silver bar.

Does the Silver Surprise metallurgical result imply an easy processing route for STXPF material?

The company reports direct smelting achieved 95% recovery without chemicals, indicating a low-complexity processing route may be suitable for this material.

Will Stuhini (STXPF) follow up the Silver Surprise results with more work in 2026?

Yes; the company plans prospecting and sampling in 2026 and may pursue a larger bulk sample or drilling, subject to permitting.

What did tailings assay after gravity separation in the Silver Surprise test for STXPF?

Tailings after gravity separation assayed 3,540 g/t Ag.