What Blue Rose Drill Core Says About Cobra's Porphyry Copper Model
Original announcement by cruxinvestor on
- Company
- Cobra Resources plc
- Ticker
- COBR
- Exchange
- Unavailable
- Region
- South Australia
- Primary commodity
- Copper
- Secondary commodities
- Gold, Molybdenum, Silver
- Document categories
- Drill results, Other
- Extracted
- 2026-10-02 12:33:53 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
Cobra Resources reported diamond drilling assays from two of four holes at the Blue Rose prospect, confirming porphyry-style alteration and mineralization at depth. The results include a 12.4m intercept at 1.01% Cu and support the company's model of a larger porphyry system beneath shallow skarn mineralization.
Reasoning: Diamond drilling results provide significant geological evidence supporting the porphyry copper model at depth, though half of the diamond assays are still pending.
Positive factors
- diamond drilling confirms porphyry vectors (potassic alteration, bornite, breccia)
- mineralization open beyond 300m downhole
- strong copper grades in diamond core (1.01% Cu)
- presence of molybdenum as a pathfinder
Negative factors
- assays for 2 of 4 diamond holes are still pending
- potassic alteration alone does not confirm copper due to model's copper-depleted zone
Facts used in scoring: 10
Classification and evidence
Step-Out Extensionpositive
Mineralization extended beyond the previously known limit.
Why it applies: Diamond drilling is testing a different part of the system (deeper) beneath the shallow skarn.
Evidence · text
“The company followed with diamond drilling beneath the skarn”
Nearology Playneutral
Value premise rests on proximity to a known deposit rather than own results.
Why it applies: The article discusses the Blue Rose prospect within the context of the Manna Hill project and its porphyry model.
Evidence · text
“Cobra Resources' diamond drilling at Blue Rose, within the Manna Hill project”
Extracted facts
Stored fact records: 10. Some facts used in scoring do not have a stored record.
Drill Results (10)
unknownManna Hill · copperGrade: 0.63Grade Unit: %Intercept: 23 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- copper
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 0.63
- Grade Unit
- %
- Intercept
- 23 m
- From
- 186 m
- To
- 209 m
- Intercept Depth
- 186 m
Classification
- Sample Type
- drill
- Group ID
- unknown:186-209
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Solid copper grade in a key porphyry vector zone.
Positive factors
- confirms copper-bearing zone in potassic alteration
Evidence · text
“returned 23 meters at 0.63% copper ... from 186 meters”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · goldGrade: 0.09Grade Unit: g/tIntercept: 23 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- gold
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 0.09
- Grade Unit
- g/t
- Intercept
- 23 m
- From
- 186 m
- To
- 209 m
- Intercept Depth
- 186 m
Classification
- Sample Type
- drill
- Group ID
- unknown:186-209
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Trace gold associated with copper intercept.
Evidence · text
“23 meters at 0.63% copper and 0.09 grams per tonne gold from 186 meters”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · copperGrade: 1.01Grade Unit: %Intercept: 12.4 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- copper
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 1.01
- Grade Unit
- %
- Intercept
- 12.4 m
- From
- 186 m
- To
- 198.4 m
- Intercept Depth
- 186 m
Classification
- Sample Type
- drill
- Group ID
- unknown:186-198.4
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Strong grade within the main intercept.
Positive factors
- high grade sub-interval
Evidence · text
“including 12.4 meters at 1.01% copper”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · copperGrade: 0.39Grade Unit: %Intercept: 36 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- copper
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 0.39
- Grade Unit
- %
- Intercept
- 36 m
- From
- 232 m
- To
- 268 m
- Intercept Depth
- 232 m
Classification
- Sample Type
- drill
- Group ID
- unknown:232-268
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Moderate grade intercept in a structural target.
Positive factors
- associated with hydrothermal breccia
Evidence · text
“36 meters at 0.39% copper ... from 232 meters”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · goldGrade: 0.05Grade Unit: g/tIntercept: 36 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- gold
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 0.05
- Grade Unit
- g/t
- Intercept
- 36 m
- From
- 232 m
- To
- 268 m
- Intercept Depth
- 232 m
Classification
- Sample Type
- drill
- Group ID
- unknown:232-268
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Trace gold.
Evidence · text
“36 meters at 0.39% copper and 0.05 grams per tonne gold from 232 meters”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · molybdenumGrade: 0.08Grade Unit: %Intercept: 16.9 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- molybdenum
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 0.08
- Grade Unit
- %
- Intercept
- 16.9 m
- From
- 335.5 m
- To
- 352.4 m
- Intercept Depth
- 335.5 m
Classification
- Sample Type
- drill
- Group ID
- unknown:335.5-352.4
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Molybdenum enrichment in a breccia-related interval.
Positive factors
- pathfinder element for porphyry
Evidence · text
“16.9 meters at 0.08% molybdenum, within strongly altered wall rock in contact with the hydrothermal breccia”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · copperGrade: 0.78Grade Unit: %Intercept: 20 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- copper
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 0.78
- Grade Unit
- %
- Intercept
- 20 m
- From
- 38 m
- To
- 58 m
- Intercept Depth
- 38 m
Classification
- Sample Type
- drill
- Group ID
- unknown:38-58
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Shallow RC skarn intercept.
Evidence · text
“One hole returned 20 meters at 0.78% copper ... from 38 meters”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · goldGrade: 0.13Grade Unit: g/tIntercept: 20 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- gold
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 0.13
- Grade Unit
- g/t
- Intercept
- 20 m
- From
- 38 m
- To
- 58 m
- Intercept Depth
- 38 m
Classification
- Sample Type
- drill
- Group ID
- unknown:38-58
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Trace gold in RC hole.
Evidence · text
“20 meters at 0.78% copper and 0.13 grams per tonne gold from 38 meters”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · copperGrade: 1.02Grade Unit: %Intercept: 74 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- copper
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 1.02
- Grade Unit
- %
- Intercept
- 74 m
- From
- 70 m
- To
- 144 m
- Intercept Depth
- 70 m
Classification
- Sample Type
- drill
- Group ID
- unknown:70-144
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Thick shallow skarn intercept.
Evidence · text
“74 meters at 1.02% copper ... from 70 meters”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
unknownManna Hill · goldGrade: 0.25Grade Unit: g/tIntercept: 74 mNeeds review: ungroundedView all detailsHide details
Identity
- Hole ID
- unknown
- Project
- Manna Hill
- Commodity
- gold
- Region
- australia_sa
- Reported Region
- australia_sa
- Ticker
- COBR
Geometry
- Grade
- 0.25
- Grade Unit
- g/t
- Intercept
- 74 m
- From
- 70 m
- To
- 144 m
- Intercept Depth
- 70 m
Classification
- Sample Type
- drill
- Group ID
- unknown:70-144
QA/QC
- QA/QC Disclosed
- Yes
- QA/QC Methods
- standards, duplicates
Review
- Needs Review
- Yes
- Review Reason
- ungrounded
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-10-02T00:00:00.000Z
Reasoning: Trace gold in RC hole.
Evidence · text
“74 meters at 1.02% copper and 0.25 grams per tonne gold from 70 meters”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
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.