Great Plains Metals Confirms “Pencil Porphyry” Discovery with a 128-meter Intercept at Goodrich Project, NSW
Great Plains Metals Corp.
Contact: Investor Relations July 28, 2026
Phone (604) 684-2181 (No.2026-07-12)
Great Plains Metals Confirms “Pencil Porphyry” Discovery with a 128-meter
Intercept at Goodrich Project, NSW
Vancouver, BC, Canada – Tuesday, July 28, 2026 - Great Plains Metals Corp. ("GPS" or
"the Company", TSX-V: GPS, Frankfurt Exchange: 8VC) is very pleased to announce that the
assay results confirm the discovery of a “pencil porphyry” at the Goodrich copper-gold project in
New South Wales, Australia.
Laboratory assays from drill hole GGDD004 have successfully verified a continuous, 128-meter
intercept of porphyry-style mineralization. This broad intersection validates the Company’s
porphyry exploration thesis: the historical, shallow Goodrich mine workings represent the upper
tip of a multiphase, intact porphyry system.
Key Drill Highlights:
• Discovery Hole Intercept: Drill hole GGDD004 intersected 128 meters of mineralization
with 0.34% copper and 0.17 g/t gold from 81.45m downhole.
• Mineralized Magmatic Cupola: A prominent high-grade zone right at the porphyry
contact returned 3.55 meters @ 2.80% Cu and 0.18 g/t Au from 81.45m.
• Continuous Disseminated Chalcopyrite: Multiple sub-intervals dissected by post-
mineral dykes confirm continuous mineralization, including 26 meters @ 0.52% Cu and
0.24 g/t Au from 102m, and 5 meters @ 0.66% Cu and 0.49 g/t Au from 158m.
• Near-Surface Depth: Importantly, the 128-meter mineralized intercept begins near-
surface at just 81.45 meters depth.
Technical Evaluation & Drill Hole Comparative Data
The initial Phase One diamond drilling program was designed to test porphyry-style mineralization
below the former Goodrich mine. Drill hole GGDD004 intersected significant disseminated copper
and gold mineralization hosted in a monzonite porphyry stock (Figure 1). Drill hole GGDD003
intersected altered monzonite porphyry representing the inner propylitic halo of the Goodrich
porphyry (Figure 4).
Table 1: GGDD004 Assay Results
Drill Hole
ID
From (m) Interval (m) Copper (%
Cu)
Gold (g/t) Geological
Context
GGDD004 81.45m 128.00m 0.34% 0.17 g/t Monzonite
Porphyry
Stock
including 81.45m 3.55m 2.80% 0.18 g/t UST Contact
Zone
including 93.00m 4.63m 0.31% 0.11 g/t Disseminated
chalcopyrite
including 102.00m 26.00m 0.52% 0.24 g/t Disseminated
chalcopyrite
including 131.00m 12.00m 0.45% 0.36 g/t Disseminated
chalcopyrite
including 158.00m 5.00m 0.66% 0.49 g/t Disseminated
chalcopyrite
including 176.00m 6.89m 0.31% 0.28 g/t Disseminated
chalcopyrite
including 205.00m 4.00m 0.26% 0.19 g/t Disseminated
chalcopyrite
Figure 1. GGDD004 Drill Intersection.
Technical Analysis of Drill Hole GGDD004
The mineralized unidirectional solidification textures (USTs) zone intersected at 81.4 meters
(Figure 2) represents the cupola contact of a mineralized monzonite porphyry stock (i.e. the top
of the system) and comprises magmatic bands of milky quartz, coarse chalcopyrite and pyrite
aggregates and minor magnetite. Below the UST zone, hydrothermal alteration consists of
pervasive white mica-chlorite and pale albite which appears to overprint an earlier K-spar-biotite
assemblage to varying degrees. The entire 128 meters of monzonite porphyry has disseminated
chalcopyrite and pyrite with traces of molybdenite in rare quartz veins (Figure 3). After 209 meters
the hole transitions into an inner propylitic zone with increasing epidote, chlorite and pyrite.
Several relatively narrow intercepts of post-mineral trachyte dykes are present throughout the
hole.
Figure 2. GGDD004 82.30 – 82.50m Brecciated quartz – magnetite UST textures. Massive
broken chalcopyrite with trace bornite.
Figure 3. GGDD004 116.85 – 162.0m Grey mottled crowded porphyry with pervasive chlorite –
illite-albite alteration & strong disseminated chalcopyrite locally up to 5% x vol. Contains miarolitic
cavities and almost no fractures & no quartz veining.
Table 2: GGDD003 Assay Results
Drill Hole
ID
From (m) Interval (m) Copper (%
Cu)
Gold (g/t) Geological
Context
GGDD003 29.15m 52.97m 0.17% 0.02 g/t Disseminated
chalcopyrite
including 29.15m 4.75m 0.56% 0.04 g/t Altered
Monzonite /
UST Zone
including 70.15m 11.97m 0.43% 0.03 g/t Altered
Monzonite /
UST Zone
Figure 4. GGDD003 Drill Intersection
Technical Analysis of Drill Hole GGDD003
Drill hole GGDD003 intersected altered chlorite-white mica-epidote monzonite porphyry
considered to represent the inner propylitic halo of the Goodrich porphyry. Two intervals
displaying UST textures were observed at 31.8 meters (Figure 5 and 6) and 76.8 meters depth
(Figure 7), both of which were associated with copper mineralization (similar to those in GGDD004
but less well-developed). A significant fault was intersected at 82m after which only weak
mineralization and alteration were encountered.
Figure 5. GGDD003 31.85 – 32.15m Quartz-magnetite UST (brecciated) with molybdenite &
chalcopyrite. Blebby disseminated chalcopyrite in chlorite-sericite-actinolite-K spar altered
crowed porphyry.
Figure 6. GGDD003 32.1 – 32.6m Quartz – magnetite USTs. Blebby chalcopyrite, chlorite-
sericite-albite ± K spar altered crowded porphyry.
Figure 7. GGDD003 76.83 – 77.34m quartz-magnetite-chalcopyrite UST; broken & brecciated.
Strong chalcopyrite in matrix and thin fractures.
The location of drill holes GGDD003 and GGDD004 at the Goodrich mine are shown below
(Figure 8).
Figure 8. The location of drill holes GGDD003 and GGDD004 at the Goodrich mine.
The other two diamond drill holes: GGDD005 and MRDD001 did not encounter significant
mineralization. Hole GGDD005 was designed to test a magnetic high target 100 meters southeast
of the Goodrich mine. It was terminated at 161.2 meters and drilled weakly magnetic
unmineralized monzonite/granodiorite. Hole MRDD001 was collared next to the small historical
workings at Mt Rose and was terminated at 140.1 meters after encountering weak pervasive
chlorite-epidote altered monzonite with minor disseminated pyrite.
Historical Drill Core Review at Londonderry
Per the Company’s news release dated 14 July 2026, a review was being conducted of historical
core archived at the New South Wales Mines Department facility in Londonderry. Detailed logging
identified that extensive, highly altered intervals from historical drill holes DDHG4 (Baker Ltd.
1980) and GRDD01 (Malachite Resources 1999) were never submitted for assay.
A total of 324 samples was compiled and delivered to Intertek Laboratories in nearby Orange.
Assays are expected within the next few weeks and will be integrated into the regional porphyry
cluster model. The Company will provide further updates in due course.
Phase Two Drilling
The Company announced previously the completion of Stage 1 of the Earn-in and Joint Venture
Agreement, achieving a 51% interest and the commencement of Stage 2 which upon completion
will result in GPS owning a 70% interest. The Company will now form a subsidiary company
(“GPS Goodrich”) in New South Wales, Australia which will then hold the tenements that comprise
the Goodrich Project. GPS Goodrich will then undertake the process for the transfer of land
access agreements and the approval of work programs. Upon completion, which is anticipated
in Q4 2026, the Phase Two drill program will commence.
Peeyush Varshney, CEO, commented:
“The results from Drill Hole GGDD004 confirming the discovery of a “pencil porphyry” at Goodrich
is a very exciting milestone for GPS. Intersecting 128 meters of copper-gold mineralization
starting from just 81 meters from the surface is significant and represents a new exploration
opportunity consistent with other porphyry deposits in the Lachlan Fold Belt, a mineral province
that has historically produced over 80 million ounces of gold and 13 million tonnes of copper.
The presence of multiple textbook UST cupola textures indicates potential for significant porphyry
mineralization that the old-timers missed. Combined with our ongoing review of previous drilling
and unassayed historical core, these definitive data points give our technical team the coordinates
needed to expand this porphyry footprint when Phase Two diamond drilling commences."
About Great Plains Metals Corp
Great Plains Metals Corp is an emerging, Australia-focused exploration company targeting
copper-gold porphyry and district-scale critical mineral discoveries. The Company’s fast-track
discovery strategy centers on technically validating high-grade, drill-ready targets situated within
premier geological jurisdictions.
• The Flagship Goodrich Project (NSW): Located in the heart of New South Wales' premier
copper-gold jurisdiction – near the Yeoval township and roughly 70 km northwest of Orange
– the project spans an extensive 290 km² across exploration licenses EL9243 and EL8538.
The Goodrich Project is situated within the world-class Lachlan Fold Belt.
• Proven Mineral Footprint: Historically the largest mine in the Yeoval district, Goodrich
operated intermittently between 1868 and 1912. Production from its historic 46 meter open pit
and 90 meter underground shafts yielded an estimated ~300 tonnes of copper, 159 kg of gold,
and 62 kg of silver, notably supporting a local smelter facility during its peak operational
phases. Modern geological modeling suggests this historical mining merely exposed the
upper tip of a significantly larger, robust porphyry core system below the old mine.
• Strategic District-Scale Upside: GPS holds a 37.1% equity stake in Eversley Resources,
giving the Company low-cost exposure to the Eversley North Gawler Craton Project in South
Australia. Spanning an extensive 2,584 km² within the prolific Olympic Dam IOCG province,
the project targets shallow, high-intensity Iron Oxide Copper-Gold (IOCG) systems alongside
a near-surface Ionic Clay Rare Earth Element (REE) prospect. With a Native Title Mining
Agreement for Exploration secured and target depths uniquely shallow at under 150 meters,
the project represents immediate, high-value asset diversification.
Corporate Information & Contacts
• Contact: Peeyush Varshney, CEO
• Email/Investor Relations: [email protected]
• Phone: (604) 684-2181
• Official Website: greatplainsmetals.com
Social: linkedin.com/company/great-plains-metals-corp | X: @GPSMetals
• Qualified Person (QP): The scientific and technical data contained in this news release
has been reviewed and approved by Douglas Kirwin, who serves as the qualified person
(QP) under the definition of National Instrument 43-101.
Cautionary Note Regarding Forward-Looking Statements
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the Company believes the expectations expressed in such forward-looking statements are based on
reasonable assumptions, such statements are not guarantees of future performance and actual results or
realities may differ materially from those in forward looking statements. Forward looking statements are
based on the beliefs, estimates and opinions of the Company’s management on the date the statements
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change.
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