Great Plains Metals Confirms "Pencil Porphyry" Discovery with a 128-meter Intercept at Goodrich Project, NSW
Original announcement by tmx on
- Company
- Great Plains Metals Corp.
- Ticker
- GPS
- Exchange
- TSX
- Region
- New South Wales
- Primary commodity
- Copper
- Secondary commodities
- Gold
- Document categories
- Drill results, Agreement transaction
- Extracted
- 2026-08-23 14:32:57 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Great Plains Metals has confirmed a 'pencil porphyry' discovery at the Goodrich Project in NSW, highlighted by a 128-meter intercept in hole GGDD004. The intercept includes a high-grade 3.55m zone at 2.80% Cu and starts at a shallow depth of 81.45m.
Reasoning: The 128m intercept at 0.34% Cu and 0.17 g/t Au, including a high-grade 3.55m @ 2.80% Cu zone, confirms a new porphyry discovery at shallow depths.
Positive factors
- significant intercept width
- high-grade cupola zone
- near-surface mineralization
- discovery of porphyry textures
Negative factors
- other holes in program were barren
Facts used in scoring: 10
Classification and evidence
Step-Out Extensionpositive
Mineralization extended beyond the previously known limit.
Why it applies: The 128m intercept validates a porphyry system below historical workings, representing a new exploration opportunity.
Evidence · text
“represents a new exploration opportunity consistent with other porphyry deposits”
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: The release mentions laboratory assays from Intertek Laboratories and a Qualified Person (Douglas Kirwin) sign-off.
Evidence · text
“delivered to Intertek Laboratories”
Bonanza Interceptpositive
Exceptionally high-grade zone, well above the deposit-type norm.
Why it applies: The 3.55m @ 2.80% Cu intercept is exceptionally high grade for a porphyry-style system.
Evidence · text
“returned 3.55 meters @ 2.80% Cu”
Extracted facts
Stored fact records: 10. Some facts used in scoring do not have a stored record.
Drill Results (10)
GGDD004Goodrich Project · copperGrade: 0.34Grade Unit: %Intercept: 128 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich Project
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.34
- Grade Unit
- %
- Intercept
- 128 m
- From
- 81.45 m
- To
- 209.45 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:81.45-209.45
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: 128m intercept of porphyry-style mineralization.
Positive factors
- broad intercept width
- porphyry style
Evidence · text
“intersected 128 meters of mineralization with 0.34% copper”
GGDD004Goodrich Project · goldGrade: 0.17Grade Unit: g/tIntercept: 128 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich Project
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.17
- Grade Unit
- g/t
- Intercept
- 128 m
- From
- 81.45 m
- To
- 209.45 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:81.45-209.45
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Gold component of the 128m porphyry intercept.
Evidence · text
“0.17 g/t gold from 81.45m downhole”
GGDD004Goodrich Project · copperGrade: 2.8Grade Unit: %Intercept: 3.55 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich Project
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 2.8
- Grade Unit
- %
- Intercept
- 3.55 m
- From
- 81.45 m
- To
- 84.95 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:81.45-84.95
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: High-grade zone at the porphyry contact.
Positive factors
- high grade
- cupola contact
Evidence · text
“3.55 meters @ 2.80% Cu”
GGDD004Goodrich Project · goldGrade: 0.18Grade Unit: g/tIntercept: 3.55 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich Project
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.18
- Grade Unit
- g/t
- Intercept
- 3.55 m
- From
- 81.45 m
- To
- 84.95 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:81.45-84.95
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Gold component of the high-grade cupola zone.
Evidence · text
“0.18 g/t Au from 81.45m”
GGDD004Goodrich Project · copperGrade: 0.52Grade Unit: %Intercept: 26 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich Project
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.52
- Grade Unit
- %
- Intercept
- 26 m
- From
- 102 m
- To
- 128 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:102.0-128.0
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Significant width at moderate grade.
Positive factors
- continuous mineralization
Evidence · text
“26 meters @ 0.52% Cu”
GGDD004Goodrich Project · goldGrade: 0.24Grade Unit: g/tIntercept: 26 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich Project
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.24
- Grade Unit
- g/t
- Intercept
- 26 m
- From
- 102 m
- To
- 128 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:102.0-128.0
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Gold component of the 26m intercept.
Evidence · text
“0.24 g/t Au from 102m”
GGDD004Goodrich Project · copperGrade: 0.66Grade Unit: %Intercept: 5 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich Project
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.66
- Grade Unit
- %
- Intercept
- 5 m
- From
- 158 m
- To
- 163 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:158.0-163.0
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: High grade sub-interval.
Positive factors
- high grade
Evidence · text
“5 meters @ 0.66% Cu”
GGDD004Goodrich Project · goldGrade: 0.49Grade Unit: g/tIntercept: 5 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich Project
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.49
- Grade Unit
- g/t
- Intercept
- 5 m
- From
- 158 m
- To
- 163 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:158.0-163.0
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Gold component of the 5m sub-interval.
Evidence · text
“0.49 g/t Au from 158m”
GGDD003Goodrich Project · copperGrade: 0.17Grade Unit: %Intercept: 52.97 mView all detailsHide details
Identity
- Hole ID
- GGDD003
- Project
- Goodrich Project
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.17
- Grade Unit
- %
- Intercept
- 52.97 m
- From
- 29.15 m
- To
- 82.12 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD003:29.15-82.12
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Wide intercept but low grade.
Positive factors
- significant width
Negative factors
- low grade
Evidence · text
“intersected altered monzonite porphyry... 52.97m 0.17% Cu”
GGDD003Goodrich Project · goldGrade: 0.02Grade Unit: g/tIntercept: 52.97 mView all detailsHide details
Identity
- Hole ID
- GGDD003
- Project
- Goodrich Project
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- New South Wales
- Ticker
- GPS
Geometry
- Grade
- 0.02
- Grade Unit
- g/t
- Intercept
- 52.97 m
- From
- 29.15 m
- To
- 82.12 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD003:29.15-82.12
- Mining Method
- open_pit
QA/QC
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Gold grade is marginal.
Negative factors
- very low grade
Evidence · text
“0.02 g/t gold”
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.