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
- Extracted
- 2026-09-16 02:34:39 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 containing 0.34% Cu and 0.17 g/t Au. The intercept includes a high-grade 3.55m zone at 2.80% Cu and is located at a shallow depth of 81.45m.
Reasoning: The discovery of a 128m continuous porphyry-style intercept with high-grade sub-intervals at shallow depth is a major exploration milestone for the Goodrich project.
Positive factors
- Significant 128m porphyry-style intercept
- High-grade 2.80% Cu sub-interval
- Near-surface mineralization starting at 81m
- Discovery of UST cupola textures
Negative factors
- Other holes in program (GGDD005, MRDD001) were barren
Facts used in scoring: 10
Extracted facts
Stored fact records: 10. Some facts used in scoring do not have a stored record.
Drill Results (10)
GGDD004Goodrich · copperGrade: 0.34Grade Unit: %Intercept: 128 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.34
- Grade Unit
- %
- Intercept
- 128 m
- From
- 81.45 m
- To
- 209.45 m
- Intercept Depth
- 81.45 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:81.45-209.45
- Mining Method
- open_pit
Location
- Location
- Monzonite Porphyry Stock
- Loc. Source
- document
QA/QC
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Significant continuous porphyry-style copper intercept.
Positive factors
- Broad 128m intercept
- Porphyry-style mineralization
Evidence · text
“intersected 128 meters of mineralization with 0.34% copper”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD004Goodrich · goldGrade: 0.17Grade Unit: g/tIntercept: 128 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.17
- Grade Unit
- g/t
- Intercept
- 128 m
- From
- 81.45 m
- To
- 209.45 m
- Intercept Depth
- 81.45 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:81.45-209.45
- Mining Method
- open_pit
Location
- Location
- Monzonite Porphyry Stock
- Loc. Source
- document
QA/QC
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Gold mineralization accompanies the primary copper discovery.
Positive factors
- Co-occurrence with significant copper
Evidence · text
“0.17 g/t gold from 81.45m downhole”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD004Goodrich · copperGrade: 2.8Grade Unit: %Intercept: 3.55 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 2.8
- Grade Unit
- %
- Intercept
- 3.55 m
- From
- 81.45 m
- To
- 84.99 m
- Intercept Depth
- 81.45 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:81.45-84.99
- Mining Method
- open_pit
Location
- Location
- UST Contact Zone
- Loc. Source
- document
QA/QC
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Strong high-grade zone within the discovery intercept.
Positive factors
- High-grade 2.80% Cu intercept
- Located at porphyry contact
Evidence · text
“3.55 meters @ 2.80% Cu”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD004Goodrich · goldGrade: 0.18Grade Unit: g/tIntercept: 3.55 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.18
- Grade Unit
- g/t
- Intercept
- 3.55 m
- From
- 81.45 m
- To
- 84.99 m
- Intercept Depth
- 81.45 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:81.45-84.99
- Mining Method
- open_pit
Location
- Location
- UST Contact Zone
- Loc. Source
- document
QA/QC
- 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 low but accompanies high-grade copper.
Evidence · text
“0.18 g/t Au from 81.45m”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD004Goodrich · copperGrade: 0.52Grade Unit: %Intercept: 26 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.52
- Grade Unit
- %
- Intercept
- 26 m
- From
- 102 m
- To
- 128 m
- Intercept Depth
- 102 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:102-128
- Mining Method
- open_pit
Location
- Location
- Disseminated chalcopyrite
- Loc. Source
- document
QA/QC
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Solid width and grade confirming continuity.
Positive factors
- Significant width of 26m
Evidence · text
“26 meters @ 0.52% Cu”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD004Goodrich · goldGrade: 0.24Grade Unit: g/tIntercept: 26 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.24
- Grade Unit
- g/t
- Intercept
- 26 m
- From
- 102 m
- To
- 128 m
- Intercept Depth
- 102 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:102-128
- Mining Method
- open_pit
Location
- Location
- Disseminated chalcopyrite
- Loc. Source
- document
QA/QC
- 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 consistent with the broader intercept.
Evidence · text
“0.24 g/t Au from 102m”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD004Goodrich · copperGrade: 0.66Grade Unit: %Intercept: 5 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.66
- Grade Unit
- %
- Intercept
- 5 m
- From
- 158 m
- To
- 163 m
- Intercept Depth
- 158 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:158-163
- Mining Method
- open_pit
Location
- Location
- Disseminated chalcopyrite
- Loc. Source
- document
QA/QC
- 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 within the main intercept.
Positive factors
- Good grade for a sub-interval
Evidence · text
“5 meters @ 0.66% Cu”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD004Goodrich · goldGrade: 0.49Grade Unit: g/tIntercept: 5 mView all detailsHide details
Identity
- Hole ID
- GGDD004
- Project
- Goodrich
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.49
- Grade Unit
- g/t
- Intercept
- 5 m
- From
- 158 m
- To
- 163 m
- Intercept Depth
- 158 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD004:158-163
- Mining Method
- open_pit
Location
- Location
- Disseminated chalcopyrite
- Loc. Source
- document
QA/QC
- 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 relatively high for this intercept.
Evidence · text
“0.49 g/t Au from 158m”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD003Goodrich · copperGrade: 0.17Grade Unit: %Intercept: 52.97 mView all detailsHide details
Identity
- Hole ID
- GGDD003
- Project
- Goodrich
- Commodity
- copper
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.17
- Grade Unit
- %
- Intercept
- 52.97 m
- From
- 29.15 m
- To
- 82.12 m
- Intercept Depth
- 29.15 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD003:29.15-82.12
- Mining Method
- open_pit
Location
- Location
- Disseminated chalcopyrite
- Loc. Source
- document
QA/QC
- QP Signed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-28T00:00:00.000Z
Reasoning: Wide but low-grade intercept representing the porphyry halo.
Positive factors
- Wide 53m intercept
Negative factors
- Low grade
Evidence · text
“52.97m 0.17% Cu”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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
GGDD003Goodrich · goldGrade: 0.02Grade Unit: g/tIntercept: 52.97 mView all detailsHide details
Identity
- Hole ID
- GGDD003
- Project
- Goodrich
- Commodity
- gold
- Region
- australia_nsw
- Reported Region
- australia_nsw
- Ticker
- GPS
Geometry
- Grade
- 0.02
- Grade Unit
- g/t
- Intercept
- 52.97 m
- From
- 29.15 m
- To
- 82.12 m
- Intercept Depth
- 29.15 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- GGDD003:29.15-82.12
- Mining Method
- open_pit
Location
- Location
- Disseminated chalcopyrite
- Loc. Source
- document
QA/QC
- 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 in this wide intercept.
Negative factors
- Very low gold grade
Evidence · text
“52.97m 0.02 g/t”
Tags used in scoring
No QA/QC Disclosurenegative
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: qaqc_disclosed is not 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.