Mr. Charles Downie of Eagle Plains reports

EAGLE PLAINS AND TANA RESOURCES EXECUTE OPTION AGREEMENT FOR THE MPW COPPER-GOLD PROJECT, BRITISH COLUMBIA

Eagle Plains Resources Ltd. and Tana Resources Inc. have entered into an option agreement dated June 17, 2025, pursuant to which Tana has been granted the exclusive right to acquire up to a 75-per-cent interest in Eagle Plains' wholly owned Mount Polley West (MPW) copper-gold project. The 7,407-hectare MPW project is located 54 kilometres north-northeast of Williams Lake and adjacent to Imperial Metals' Mount Polley property, in British Columbia's Cariboo region. Management of both Eagle Plains and Tana consider the MPW property to hold excellent potential for copper-gold porphyry and epithermal gold mineralization. The property is owned 100 per cent by Eagle Plains, with a portion of the property subject to net smelter return (NSR) royalties held by third parties, including Eagle Royalties Ltd.

Key highlights include:

• Historical trenching returned 1.12 per cent copper over 35 metres, including 7.12 per cent copper over five metres;
• Historic exploration has documented:
• • Multiple mineralized intrusions similar in nature to the Mount Polley intrusive complex (MPIC);
  • Coincident geophysical and geochemical anomalies that support the presence of additional prospective intrusions;
• Exploration by Eagle Plains has located down-ice basal till gold grain counts indicative of potential proximal sources.

Chuck Downie, president and chief executive officer of Eagle Plains, commented, "Grassroots fieldwork by Eagle Plains and past operators at MPW has identified many of the geological indicators associated with porphyry and epithermal mineralizing systems and we look forward to working with the Tana team to advance the project."

"We are excited to add the Mount Polley West project to the Tana portfolio and work with the Eagle Plains, one of the top project generators," commented Vic Koraijan, chief executive officer of Tana. "The historic compilation, in combination with the recent work by Eagle Plains, has identified excellent porphyry and epithermal targets in a known mineral-rich belt," he added.

To exercise the option, Tana must make a series of cash payments and share issuances to Eagle Plains and finance exploration expenditures on the project. These payments, share issuance and expenditures are separated into two phases, with the first option entitling Tana to acquire a 60-per-cent interest in the project by paying $250,000, issuing an aggregate of 2.75 million common shares to Eagle Plains and financing $3-million in exploration expenditures on the project over a four-year term, including $75,000 in expenditures in 2025. Pursuant to the second option (if elected by Tana), Tana may acquire an additional 15-per-cent interest in the project (for a 75-per-cent total interest) by notifying Eagle Plains of its intent to increase its interest to 75 per cent and by completing a bankable feasibility-level study on the property prior to Dec. 31, 2031.

If either the first option or the second option is exercised, a 2-per-cent smelter return royalty will be granted to the Eagle Plains over part of the property, 1 per cent of which may be repurchased for $1-million.

Eagle Plains will serve as operator under the terms of option and will reserve the right to use TerraLogic Exploration Inc. as geoscience consultant. Following the exercise of either the first option or the second option, Tana and Eagle Plains shall then form a 60/40 or 75/25 joint venture to further explore and develop the property.

Some of the above results were taken directly from Minfile descriptions and assessment reports (ARIS) filed with the British Columbia government. Management cautions that historical results were collected and reported by past operators and have not been verified nor confirmed by a qualified person but form a basis for continuing work on the subject properties. Management cautions that past results or discoveries on proximate land are not necessarily indicative of the results that may be achieved on the subject properties.

The Mount Polley West property lies in the Quesnel trough and is underlain by the Triassic Nicola group volcanics and volcaniclastics intruded by coeval and younger small stocks, plugs and dikes of syenitic to monzodioritic composition, a setting similar to the Mount Polley mine approximately five kilometres to the east. In addition, 10 documented British Columbia Minfile mineral occurrences lie within the property boundaries, primarily copper showings.

Qualified person

Charles C. Downie, PGeo, a qualified person for the purposes of National Instrument 43-101, Standards of Disclosure for Mineral Projects, and a director of Eagle Plains, has reviewed and approved the scientific and technical disclosure in this news release.

About Eagle Plains Resources Ltd.

Based in Cranbrook, B.C., Eagle Plains is a well-financed, prolific project generator that continues to conduct research, acquire and explore mineral projects throughout Western Canada, with a focus on critical metals integral to an increasingly electrified, decarbonized economy.

The company was formed in 1992 and is the ninth-oldest listed issuer on the TSX Venture Exchange (and one of only three that has not seen a rollback or restructuring of its shares). Eagle Plains has continued to deliver shareholder value over the years and, through numerous spinouts, has transferred over $100-million in value directly to its shareholders, with Copper Canyon Resources and Taiga Gold Corp. being notable examples. Eagle Plains' latest spinout, Eagle Royalties, was listed on May 24, 2023, and holds a diverse portfolio of royalty assets throughout Western Canada.

On Oct. 2, 2024, Eagle Plains announced the formation of a separate division within the company that will give Eagle Plains' shareholders direct exposure to strategic opportunities in Canadian green energy transition. As a wholly owned subsidiary of Eagle Plains, Osprey Power Inc. (OP) will focus on identifying and advancing innovative and diverse clean energy project portfolios in target markets throughout Canada, with an initial focus on Western Canada.

Eagle Plains' core business is acquiring grassroots critical and precious metal exploration properties. The company is committed to steadily enhancing shareholder value by advancing its diverse portfolio of projects toward discovery through collaborative partnerships and development of a highly experienced technical team.

Expenditures from 2010 to 2023 on Eagle Plains-related projects exceed $39-million, the majority of which was financed by third party partners. This exploration work resulted in approximately 50,000 metres of diamond drilling and extensive ground-based exploration work facilitating the advancement of numerous projects at various stages of development.

Throughout the exploration process, Eagle Plains' mission is to help maintain prosperous communities by exploring for and discovering resource opportunities while building lasting relationships through honest and respectful business practices.

We seek Safe Harbor.