# Great Plains Metals Confirms "Pencil Porphyry" Discovery with a 128-meter Intercept at Goodrich Project, NSW

Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550

Original source: https://money.tmx.com/en/quote/GPS/news/6409896897372305/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep

Publisher: tmx

Original announcement: 2026-07-28T07:05:00.000Z

Analysis by Minestarters Atlas

Atlas analysis published: Unknown date

Atlas analysis updated: Unknown date

- 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

Narrative sentiment: 0.80 · Bullish

## Minestarters Atlas 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 factor: significant intercept width

- Positive factor: high-grade cupola zone

- Positive factor: near-surface mineralization

- Positive factor: discovery of porphyry textures

- Negative factor: other holes in program were barren

Facts used in scoring: 10

## Classification and evidence

**Step-Out Extension**

Polarity: positive

Definition: 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 Disclosed**

Polarity: positive

Definition: 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 Intercept**

Polarity: positive

Definition: 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)

### GGDD004

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-0)

Goodrich Project · copper

#### 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 factor: broad intercept width

- Positive factor: porphyry style

Evidence · text

> intersected 128 meters of mineralization with 0.34% copper

### GGDD004

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-1)

Goodrich Project · gold

#### 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

### GGDD004

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-2)

Goodrich Project · copper

#### 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 factor: high grade

- Positive factor: cupola contact

Evidence · text

> 3.55 meters @ 2.80% Cu

### GGDD004

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-3)

Goodrich Project · gold

#### 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

### GGDD004

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-4)

Goodrich Project · copper

#### 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 factor: continuous mineralization

Evidence · text

> 26 meters @ 0.52% Cu

### GGDD004

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-5)

Goodrich Project · gold

#### 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

### GGDD004

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-6)

Goodrich Project · copper

#### 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 factor: high grade

Evidence · text

> 5 meters @ 0.66% Cu

### GGDD004

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-7)

Goodrich Project · gold

#### 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

### GGDD003

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-8)

Goodrich Project · copper

#### 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 factor: significant width

- Negative factor: low grade

Evidence · text

> intersected altered monzonite porphyry... 52.97m 0.17% Cu

### GGDD003

[Link to this fact](https://atlas-staging.minestarters.com/news/great-plains-metals-confirms-pencil-porphyry-discovery-with-a-128-meter-intercep--08f62273-f199-4abe-911d-86cd75cef550#fact-drill-facts-9)

Goodrich Project · gold

#### 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 factor: 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.