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GPS.V ·

Great Plains Metals Completes the First Stage of the Farm-in at Yeoval Goodrich

Corporate Updates

Great Plains Metals Corp.

Contact: Investor Relations June 15, 2026

Phone (604) 684-2181 (No.2026-06-10)

Great Plains Metals Completes the First Stage of the Farm-in at Yeoval Goodrich

Vancouver, BC, Canada – Monday, June 15, 2026 - Great Plains Metals Corp. ("GPS" or

"the Company", TSX-V: GPS, Frankfurt Exchange: 8VC) is pleased to announce that it has

completed the expenditure and drilling requirements to achieve a 51% interest in the

Yeoval Goodrich Project.

Highlights:

● GPS completes Stage 1 to earn 51% of the Yeoval Goodrich Project

● Summary of exploration activities during Stage 1

● Yeoval Goodrich Project Overview

Completion of Stage 1 to achieve a 51% Project Interest

The Company signed an Earn-in and Joint Venture Agreement (“Agreement”) with ASX

listed, Godolphin Resources Ltd (“Godolphin”) on 4 June 2025. Under the terms of the

Agreement, GPS had the right to earn a 51% interest by incurring A$1,000,000 in

Exploration Expenditure. Additionally, the Company was required to complete a minimum

of 500 metres of reverse circulation and/or diamond drilling. GPS has provided Godolphin

with a Satisfaction Notice that the Stage 1 Earn-in commitments have been met.

Furthermore, the Company has provided Notice to Godolphin that it elects to progress to

Stage 2 of the Agreement. Under the terms of Stage 2, GPS must incur a further

A$1,000,000 in Exploration Expenditure over the next 12 months and complete a

minimum of 500 metres of reverse circulation and/or diamond drilling to increase its

interest to 70%. The Company completed a private placement in the amount of $4.18

million in February 2026 to ensure it was funded to progress the project through the next

phase. The alternative path to Stage 2 is if Godolphin informs the Company within 20

business days from the date the Notice was given that it prefers to form a 51/49% Joint

Venture (in favour of GPS) and will then be responsible for 49% of the future expenditure.

Summary of exploration activities during Stage 1

The recent air-core program covered 2,065 metres of shallow air core drilling around the

former Goodrich mine and Mt Rose. This has successfully advanced geological

understanding at the Goodrich and Mt Rose targets.

Importantly, the historical Goodrich mine and the newly recognized pencil porphyry at Mt

Rose appear to represent focal points within a widespread hydrothermal system and

strengthens the case that a previously unrecognized porphyry copper-gold system could

be present at Yeoval Goodrich.

A local contractor commenced diamond drilling (Figure 1) at Goodrich in May with an

initial program of up to 2,000 meters. Four diamond drill holes for a total of just over 1,000

metres have now been completed which concludes Phase One of the drill program. GPS

will provide further updates upon receiving assay results from the laboratory.

Yeoval Goodrich Project Overview

The Project consists of two tenements, EL 8538 and EL 9243 (Figure 2).

The Yeoval Project is located approximately 70 kilometres northwest of Orange in central

New South Wales and sits within the geological setting of the Macquarie Arc. The

tenements cover an area of approximately 290 square kilometres. The area is underlain

by granites, granodiorites and volcanics, and more than 60 historic mine workings occur

within the project. The project area is readily accessible via sealed and unsealed roads

and is adjacent to railway infrastructure.

The Goodrich Mine is a historic copper gold mine and was mined between 1868 and

1912. Mt Rose is located approximately two kilometres south from the Goodrich mine

(Figure 3) and limited mining occurred during 1886.

The many gold-copper showings in the Yeoval district have been explored almost

continuously since the 1960s, though mostly at shallow levels only, including completing

both reverse circulation (RC) and diamond drill holes. Most of this exploration was carried

out prior to the Discovery 2000 airborne magnetics and radiometrics becoming available

for parts of the Lachlan Fold Belt including the Yeoval district.

Copper, gold and other base metal mineralization is widespread in the region and the

main mineralization styles include porphyry style gold-copper mineralization.

Peeyush Varshney, CEO, commented:

"Completing the first stage of our earn-in agreement marks a pivotal milestone for GPS

at Yeoval Goodrich. We are increasingly confident that a previously unrecognized

porphyry copper-gold system may be hosted here.

With Phase One of the drill program having been completed we eagerly look forward to

the assay results and additional geological modelling with a view to further advance the

Project.”

Figure 1. The drill rig at Mt Rose

Figure 2. Tenement map (EL 8538 and EL 9243)

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

About Great Plains Metals Corp

GPS is an emerging Australia-focused copper-gold explorer. The strategy of GPS is to

focus on drill-ready projects with a rapid discovery model in highly prospective geological

addresses. The Company has a portfolio that consists of Yeoval Goodrich, located in the

Lachlan Fold Belt; the Everton Project in Victoria; and an IOCG project in South Australia.

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

www.greatplainsmetals.com

Cautionary Note Regarding Forward-Looking Statements

This news release contains certain statements that may be deemed “forward-looking statements.”

Forward-looking statements are statements that are not historical facts and are generally, but not

always, identified by the words “expects”, “plans”, “anticipates”, “believes”, “intends”, “estimates”,

“projects”, “potential” and similar expressions, or that events or conditions “will”, “would”, “may”,

“could” or “should” occur. Although 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 are made. Except as

required by law, the Company undertakes no obligation to update these forward-looking

statements in the event that management’s beliefs, estimates or opinions, or other factors, should

change.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined

in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy

of this press release.