Stuhini Reports Strong Metallurgical Recoveries from Surface Mini-Bulk Sample at Silver Surprise Zone, Ruby Creek Project
Original announcement by tmx on
- Company
- Stuhini Exploration Ltd.
- Ticker
- STU
- Exchange
- TSX
- Region
- British Columbia
- Primary commodity
- Silver
- Secondary commodities
- Molybdenum
- Document categories
- Metallurgy
- Extracted
- 2026-08-22 03:29:02 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Stuhini Exploration reported highly favorable metallurgical results from a 719 kg surface mini-bulk sample at the Silver Surprise Zone. Direct smelting achieved 95% silver recovery from a 4,200 g/t silver feed, while gravity separation provided a preliminary 15% recovery.
Reasoning: The direct smelting test achieved an exceptional 95% silver recovery from an ultra-high-grade (4,200 g/t) mini-bulk sample, suggesting a low-complexity, high-margin processing route.
Positive factors
- exceptional silver recovery
- high-grade feed
- simple processing route
Facts used in scoring: 3
Classification and evidence
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Direct smelting achieved 95% silver recovery, which is exceptional.
Evidence · text
“Direct smelting test achieved 95% silver recovery”
Free Millingpositive
Simple, clean ore amenable to standard processing without oxidation.
Why it applies: The high native silver content and simple mineralogy allow for high recovery via simple smelting or gravity.
Evidence · text
“high native silver content and simple quartz-hosted mineralogy make the mineralization particularly well-suited”
Bench Scale Onlynegative
Only preliminary bench tests completed — no locked-cycle or pilot work.
Why it applies: The tests were performed on a mini-bulk sample using a ball mill and a shaking table.
Evidence · text
“processed under the direction of metallurgist Rino Mihoc of Ruby Gold Ltd. The sample was milled in a 3' x 3' Denver ball mill”
Extracted facts
Stored fact records: 3. Some facts used in scoring do not have a stored record.
Metallurgical Results (3)
direct smeltingsilverRecovery: 95 %Head Grade: 4200Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- silver
- Ticker
- STU
Test Work
- Program Status
- preliminary
- Test Type
- direct smelting
- Processing Route
- direct smelting
- Sample
- 1585 lb (719 kg) surface mini-bulk sample from Silver Surprise Zone
Recovery
- Recovery
- 95 %
- Recovery Basis
- to_payable_metal
- Head Grade
- 4200
- Head Grade Unit
- g/t
Lab
- Laboratory
- Ruby Gold Ltd.
- Consultant
- Rino Mihoc
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-12-01T00:00:00.000Z
Reasoning: 95% recovery on 4,200 g/t Ag is an exceptional result for a direct smelting test.
Positive factors
- exceptional recovery
- high grade
Evidence · text
“Direct smelting test achieved 95% silver recovery”
gravitysilverRecovery: 15 %Head Grade: 4200Head Grade Unit: g/tView all detailsHide details
Identity
- Commodity
- silver
- Ticker
- STU
Test Work
- Program Status
- preliminary
- Test Type
- gravity
- Processing Route
- gravity separation
- Sample
- 1585 lb (719 kg) surface mini-bulk sample via gravity separation
Recovery
- Recovery
- 15 %
- Recovery Basis
- to_concentrate
- Head Grade
- 4200
- Head Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-12-01T00:00:00.000Z
Reasoning: 15% recovery via gravity is low but expected for a single-pass shaking table test on coarse material.
Positive factors
- simple process
Negative factors
- low recovery
Evidence · text
“Gravity separation using a single pass on a Gemini shaking table recovered 15% of the contained silver”
Fact 3silverView all detailsHide details
Identity
- Commodity
- silver
- Ticker
- STU
Test Work
- Sample
- Gravity concentrate from mini-bulk sample
Recovery
- Conc. Grade
- 10
- Conc. Grade Unit
- %
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-12-01T00:00:00.000Z
Reasoning: Concentrate grade of 10% Ag is reported from the gravity table pass.
Evidence · text
“concentrate from a single pass on the gravity table graded approximately 10% silver”
How Atlas produces this analysis
Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.