Vault Announces Acquisition of U.S. Historical Mirage-Mariposa Tungsten Mine within the Gray Eagle Project
Original announcement by tmx on
- Company
- Vault Strategic Mining Corp.
- Ticker
- KNOX
- Exchange
- TSX
- Region
- California
- Primary commodity
- Tungsten
- Secondary commodities
- Silver
- Document categories
- Resource update, Agreement transaction
- Extracted
- 2026-09-16 06:46:25 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Vault Strategic Mining Corp. has entered into a definitive agreement to acquire 100% of the historical Mirage-Mariposa Tungsten Mine in California for US$380,000 and a 2.0% NSR royalty. The acquisition includes historical resource estimates of approximately 21,000 indicated and 34,400 inferred tonnes at 0.15% tungsten trioxide, though these figures are non-compliant with modern NI 43-101 standards.
Reasoning: The company is acquiring a historical tungsten-silver asset at a low cost, but the resource relies on non-compliant historical data that requires modern verification.
Positive factors
- Acquisition of a historical past-producing mine
- Combination of tungsten and precious metals in a skarn environment
- Low acquisition cost (US$380,000 total cash)
Negative factors
- Historical resource data is non-NI 43-101 compliant
- No modern drilling has been performed to confirm historical grades
- Resource is largely subeconomic or inferred
Facts used in scoring: 2
Classification and evidence
Historical Estimate Onlynegative
Estimate pre-dates or does not comply with current JORC/NI 43-101 standards — requires verification drilling.
Why it applies: The resource estimates provided are based on USGS MRDS records and are explicitly stated as non-NI 43-101 compliant.
Evidence · text
“historical resource estimates should not be relied upon as current mineral resources or reserves”
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: The announcement mentions 34,400 inferred tons as part of the historical resource.
Evidence · text
“34,400 inferred tons”
Extracted facts
Stored fact records: 2. Some facts used in scoring do not have a stored record.
Resource Estimates (2)
indicatedGray Eagle Project · tungstenTonnes: 21000Grade: 0.15Grade Unit: %Historical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Gray Eagle Project
- Commodity
- tungsten
- Region
- california
- Reported Region
- California
- Ticker
- KNOX
Resource scope
- Estimate type
- resource
- Resource group id
- resource:a685743b16ad8b6e96c9
- Deposit or zone
- Mirage-Mariposa
Resource Data
- Category
- indicated
- Tonnes
- 21000
- Grade
- 0.15
- Grade Unit
- %
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
Dates
- Event date
- 2026-05-11T00:00:00.000Z
Reasoning: Historical indicated resource reported via USGS MRDS; requires modern verification.
Negative factors
- Non-compliant historical data
Evidence · text
“historical resources of approximately 21,000 indicated tons... with an average grade of 0.15% tungsten trioxide”
Tags used in scoring
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: category is "indicated"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
inferredGray Eagle Project · tungstenTonnes: 34400Grade: 0.15Grade Unit: %Historical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Gray Eagle Project
- Commodity
- tungsten
- Region
- california
- Reported Region
- California
- Ticker
- KNOX
Resource scope
- Estimate type
- resource
- Resource group id
- resource:944d32cff26bb5e94382
- Deposit or zone
- Mirage-Mariposa
Resource Data
- Category
- inferred
- Tonnes
- 34400
- Grade
- 0.15
- Grade Unit
- %
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
Dates
- Event date
- 2026-05-11T00:00:00.000Z
Reasoning: Historical inferred resource reported via USGS MRDS; requires modern verification.
Negative factors
- Non-compliant historical data
Evidence · text
“34,400 inferred tons, with an average grade of 0.15% tungsten trioxide”
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
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.