Star Royalties Highlights Positive Copperstone Construction Decision and PFS Results by Minera Alamos
Original announcement by tmx on
- Company
- Star Royalties Ltd.
- Ticker
- STRR
- Exchange
- TSX
- Region
- Arizona
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Resource update, Economic study
- Extracted
- 2026-09-18 23:17:48 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Star Royalties highlights the positive Pre-Feasibility Study (PFS) results for the Copperstone Gold Project, which features an after-tax NPV5% of $374 million and an IRR of 108%. The project, owned by Minera Alamos, has received a construction decision with initial production expected in mid-2027, significantly increasing the value of Star Royalties' 4% gold stream.
Reasoning: The announcement highlights a high-return PFS for the Copperstone project, which directly increases the value of Star Royalties' 4% gold stream. The resource expansion and strong economics provide significant upside.
Positive factors
- Exceptional IRR of 108% in PFS
- Significant resource growth (110% increase in contained gold)
- Rapid payback of 1.2 years
- Construction decision approved by Minera Alamos
Facts used in scoring: 3
Classification and evidence
PFS Completepositive
AACE Class 3 study complete.
Why it applies: The document reports results from a Pre-Feasibility Study (PFS) for the Copperstone project.
Evidence · text
“results of the Pre‑Feasibility Study (“ PFS ”) announced by Minera Alamos Inc.”
High IRRpositive
Post-tax real unlevered IRR in the strong tier or better.
Why it applies: The PFS reports an after-tax IRR of 108%, which is in the exceptional tier.
Evidence · text
“after‑tax IRR of 108%”
Contained Metal Growthpositive
True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes.
Why it applies: Contained gold ounces increased by 110% compared to the previous mineral resource estimate.
Evidence · text
“represent a 110% increase in contained gold ounces compared to the previous mineral resource estimate”
Fast Paybackpositive
Payback in the strong tier or better, on the required basis.
Why it applies: The payback period is 1.2 years, which is in the strong tier.
Evidence · text
“payback of 1.2 years”
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: The source explicitly discloses a revised resource estimate
Evidence · text
“increased resource”
Extracted facts
Stored fact records: 2. Some facts used in scoring do not have a stored record.
Resource Estimates (2)
indicatedCopperstone · goldTonnes: 4054000Grade: 4.83Grade Unit: g/tContained Metal: 630Contained Unit: kozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- STRR
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- Resource group id
- resource:1ce48b007a191c8b94cf
- Mining method
- combined
- Ownership percent
- 100 %
Resource Data
- Category
- indicated
- Tonnes
- 4054000
- Grade
- 4.83
- Grade Unit
- g/t
- Contained Metal
- 630
- Contained Unit
- koz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-29T00:00:00.000Z
Reasoning: Strong resource expansion reported.
Positive factors
- Significant contained metal growth
Evidence · text
“Measured & Indicated Resources of 4,054 kt grading 4.83 grams per tonne gold (“ g/t ”) and containing 630 koz gold”
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
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: the release compares against a previous estimate
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: the release names the study this estimate supports
probableCopperstone · goldTonnes: 1934000Grade: 4.87Grade Unit: g/tContained Metal: 303Contained Unit: kozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- STRR
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101
- Resource group id
- resource:f9189305371dd2e339a1
- Mining method
- combined
- Ownership percent
- 100 %
Resource Data
- Category
- probable
- Tonnes
- 1934000
- Grade
- 4.87
- Grade Unit
- g/t
- Contained Metal
- 303
- Contained Unit
- koz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-29T00:00:00.000Z
Reasoning: Declaration of maiden reserves.
Positive factors
- Maiden reserve declaration
Evidence · text
“maiden Proven & Probable Reserves of 1,934 kt grading 4.87 g/t and containing 303 koz gold have been declared.”
Tags used in scoring
Probable Reservepositive
Indicated Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "probable"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: the release compares against a previous estimate
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: the release names the study this estimate supports
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.