<div id="readability-page-1"><div>(TheNewswire)Vancouver, BC, Canada – Monday, June 15, 2026 – TheNewswire - Great Plains Metals Corp. (&#34;GPS&#34; or &#34;the Company&#34;, 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:<ul><li>GPS completes Stage 1 to earn 51% of the Yeoval Goodrich Project</li><li>Summary of exploration activities during Stage 1</li><li>Yeoval Goodrich Project Overview</li></ul>Completion of Stage 1 to achieve a 51% Project InterestThe 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 1The 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 OverviewThe 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:&#34;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.”Click Image To View Full SizeFigure 1. The drill rig at Mt RoseClick Image To View Full SizeFigure 2. Tenement map (EL 8538 and EL 9243)Click Image To View Full SizeFigure 3. View looking south towards Goodrich and Mt Rose mines, Yeoval, New South Wales.About Great Plains Metals CorpGPS 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) 684-2181www.greatplainsmetals.comCautionary Note Regarding Forward-Looking StatementsThis 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.Copyright (c) 2026 TheNewswire - All rights reserved.</div></div>

Great Plains Metals Corp. completed Stage 1 of its earn-in agreement with Godolphin Resources Ltd, securing a 51% interest in the Yeoval Goodrich Project by meeting A$1 million expenditure and drilling requirements. The company has elected to proceed to Stage 2, requiring an additional A$1 million and 500 meters of drilling to increase its stake to 70%. This follows a $4.18 million private placement in February 2026 to fund further exploration.

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