Vancouver, BC, Canada – Tuesday, January 13, 2026 – TheNewswire - Great Plains Metals Corp. ("GPS" or "the Company", TSX-V: GPS, Frankfurt Exchange: 8VC) is pleased to provide an update regarding the proposed drill programs at both the Yeoval Goodrich Project in New South Wales and Everton Project in Victoria (Figure 1), currently scheduled in Q1/Q2 2026 .

Highlights:

• Re-evaluation of legacy data has identified drill targets at Goodrich. 

• The Characteristics of Pencil Porphyries – the Goodrich Mine, a previously unrecognized pencil porphyry.  

• Mt Rose – a new discovery and an unrecognized pencil porphyry.  First pass aircore drill program planned. 

• Everton Project Update – a previously unrecognized pencil porphyry with walkup drill targets. 

During December 2025, Douglas Kirwin and Aidan Bishop conducted a field visit to the Yeoval Goodrich Project to inspect numerous gold-copper prospects and to introduce GPS to key landowners.  Re-evaluation of legacy technical data has identified drill targets at the historic Goodrich gold-copper mine interpreted to represent the uppermost section of a mineralized pencil porphyry system. Previous mining was centered on a monzonitic cupola with distinctive unidirectional solidification textures (USTs) based on mineralized samples observed at the mine dumps (Figure 2).  A preliminary diamond drill campaign is currently being finalized and further updates will be provided this month. Discussions also took place with the preferred local drill contractor with a view to implementing the drill program in Q2 2026.

The Characteristics of Pencil Porphyries

Pencil porphyries are pipe-like, vertically extensive intrusive igneous bodies associated with porphyry copper-gold mineralization. While typically smaller in size compared to other types of porphyry deposits, they often contain a higher concentration of valuable metals, making them significant economic targets. They get their name from their narrow, pencil-like shape and often occur in clusters.

Diagnostic Unidirectional Solidification Textures (USTs) are magmatic quartz bands often observed at the top and inner contacts within a "cupola" or apex of the intrusion.  They mark the transition zone between the magma and the overlying hydrothermal system. The pencil porphyry is the underlying, cylindrical intrusive body which may extend to vertical intervals of several hundred meters or more. The Goodrich Mine is a previously unrecognized pencil porphyry and the purpose of the drill campaign is to test mineralization below the old mine.  During the period 1868-1886 gold-copper mining at Goodrich supported a small local smelter.

Mt Rose – a new discovery

During the field visit, mineralized UST’s were recognized in the dumps of a small historic mine named Mt Rose (Figure 3), located approximately two kilometres south from the Goodrich mine (Figure 4).  Rock textures and gold-copper mineralization are identical to those observed at the Goodrich mine, indicating the presence of another unrecognized pencil porphyry. A first pass aircore drill program comprising 24 shallow holes over a 300 x 200 metre grid is planned at Mt Rose. The objective of this program is to map bedrock geology, alteration and geochemistry with a view to develop drill targets below and surrounding the old workings.  Limited mining at Mt Rose occurred during 1886.

Given the proximity of Mt Rose to Goodrich, a comprehensive investigation of all copper mapped occurrences will now be undertaken within a 2 kilometre radius of both Mt Rose and the Goodrich mine (Figure 5).

Everton Project Updates

Meetings were held during December with the Lead Geologist of the Everton Project.  The Everton Mine is also a previously unrecognized pencil porphyry with several occurrences of mineralized UST’s with widespread visible disseminated molybdenite.  Land access has been successfully negotiated and a work program is currently going through approval with a view to drilling beneath the historic mine towards the end of Q1 2026.  Approximately 20,000T @ 1.4% Mo was mined at Everton during the period 1918-1926.

The Company will provide further updates this month with details regarding the upcoming Everton drill program.  

Aidan Bishop, CEO, commented:

“A clear theme is emerging at both the Yeoval Goodrich and Everton Projects where the presence of rocks displaying unidirectional solidification textures (USTs) indicates the tops of unrecognized pencil porphyries. The exciting aspect about these projects is that the pencil porphyries are exposed at the surface.  Others may be present nearby under cover.  The focus of future drill programs will be to delineate the geometry and size of the system and determine the intensity of mineralization.  

The recognition of Mt Rose as a pencil porphyry cupola was the highlight of the recent field trip.  This discovery underscores that pencil porphyries often occur in clusters.  GPS is set for an exciting year – we are certainly ‘amongst the right rocks’ in one of Australia’s most prospective mineral belts, the Lachlan Fold Belt.  I look forward to sharing further detail regarding the upcoming drill programs.”

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Figure 1.  GPS Project Portfolio Map.

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Figure 2.  UST’s with quartz-magnetite-chalcopyrite in epidote-albite/Kspar altered monzonite, Goodrich gold-copper mine dump samples.

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Figure 3.  View looking south towards Goodrich and Mt Rose mines, Yeoval, New South Wales.

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Figure 4.  Mineralized cupola rocks, Mt Rose, Yeoval, New South Wales.

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Figure 5.  Known copper-gold occurrences within the 14 kilometre northeast-trending Yeoval corridor

Qualified Person: 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.

GREAT PLAINS METALS CORP.

For further information, please contact:        

Peeyush Varshney
Phone: (604) 684-2181

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