TomaGold launches AMT survey at Berrigan Mine

Highlights Advanced AMT Survey Designed to Unlock District-Scale Discovery Potential The survey aims to better define the district’s structural architecture, identify deep conductive corridors associated with mineralized systems such as those observed in the Main and Deep Zones at the Berrigan Mine Project, and prioritize high-potential drill targets. Survey Builds on Recent Exploration Success and Expanding Geophysical Program This work builds directly on the successful Phase 2 drilling program and the broader geophysical campaign launched on May 28, 2026. Comprehensive 7.5 Line-Kilometre Survey Grid Underway The survey consists of a grid comprising 14 lines of variable length with measurement stations spaced every 25 metres, for a total of 7.5 line-kilometres.

Deep-Penetrating Technology Provides Valuable Subsurface Insights AMT is a deep-penetrating geophysical method that maps subsurface resistivity contrasts using natural electromagnetic fields. Phase 2 drilling program results still pending Mineralization was consistently observed in the drill core recovered from all five extension holes drilled, for which assay results are pending. TOMAGOLD CORPORATION (TSXV: LOT; OTCPK: TOGOF) (“ TomaGold ” or the “ Company ”) is pleased to announce the commencement of an audio-frequency magnetotelluric (“ AMT ”) geophysical survey at its Berrigan Mine project, located in the Chibougamau Mining Camp of Québec.

Conducted by Géophysique TMC, this AMT survey represents the next phase of TomaGold’s systematic exploration strategy and follows the completion of the Phase 2 extension drilling program, for which assay results from all five drill holes remain pending, as well as the launch of the major prospecting and geophysical campaign announced on May 28, 2026. This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20260623115100/en/ Figure 1: AMT survey on the Berrigan Mine Project The Berrigan system is characterized by high-grade polymetallic (zinc-gold-copper-silver) mineralization hosted in conductive structures along major shear zones.

Building on prior borehole EM results and recent drilling successes, including significant intersections in the Berrigan Deep zone, the AMT survey is expected to deliver a district-scale 3D understanding of the structural architecture controlling mineralization across the project area. The survey is expected to identify new conductive corridors, potential extensions of known mineralization, and additional concealed massive sulphide targets at depth (up to approximately 2 km). These insights will help refine exploration models and optimize future drill targeting across TomaGold's consolidated Chibougamau property portfolio.

Audio-frequency magnetotellurics is a passive geophysical technique that records natural variations in the Earth's electric and magnetic fields across audio frequencies. It excels at imaging resistivity contrasts in the subsurface at depths ranging from tens of metres to several kilometres, making it particularly well suited for delineating deep structural features and conductive bodies associated with polymetallic mineralization. The current AMT survey consists of a grid of 14 lines of variable length, with measurement stations positioned every 25 metres along the lines, for a total coverage of 7.5 line-kilometres.

The contractor is responsible for line cutting and precise chaining at 25-metre intervals. This configuration is expected to provide high-resolution data to map deep resistivity contrasts beneath the Berrigan Mine and surrounding areas (see Figure 1). David Grondin, President and CEO of TomaGold, stated: "We are excited to commence this AMT survey, which represents a significant step forward in our systematic exploration strategy at Berrigan.

The survey is expected to provide a clearer understanding of the structural architecture controlling mineralization at depth, while helping to identify new conductive corridors, potential extensions of known mineralization and additional high-priority exploration targets. Together with our ongoing drilling and geophysical programs, the results will help unlock the broader potential of our Chibougamau assets and guide the next phase of value-creating exploration activities.” Progress Report from TomaGold's Affiliated Company Carbon2Green Developments Inc., a private company in which TomaGold holds a 35% interest, together with AM Resources Corp. (35%) and certain TomaGold directors and members of management (30%), has recently begun establishing a portfolio of mining rights covering several peatland areas in Québec. The Company is currently evaluating these assets as part of an initiative aimed at determining their economic potential with a view to carbon credit monetization through the development of projects focused on the conservation, restoration and environmental enhancement of peatlands.

Over the coming weeks, Carbon2Green intends to complete its preliminary evaluations and continue its discussions with various stakeholders, investors, communities, interest groups and government representatives in order to gather relevant information regarding the regulatory framework applicable to these assets and the optimization of their value, which is considered to have significant potential. About the Berrigan Mine Project The Berrigan Mine property consists of 16 claims totalling 483 hectares located 4 km north-northwest of the town of Chibougamau. TomaGold has an option to acquire 100% of the property from Chibougamau Independent Mines Inc. The property has been the subject of more than one historical estimate.

Met-Chem Canada Inc. prepared the most recent of these in April 2001 in a report titled: “Pre-feasibility study: Etude Conceptuelle, Projects Berrigan and Tortigny” by Chuinard et al. In the report, a resource estimate completed using polygonal estimation techniques stated 1.39 Mt grading 3.17% Zn and 1.77 g/t Au on the main Berrigan Mine zone. No resource classifications were given for the resource (GM61359).

The mineral resource estimate presented above is historical in nature and was not prepared in accordance with National Instrument 43-101 standards. Accordingly, the reader is cautioned not to rely on this estimate, as the Company is not treating the estimate as a current mineral resource. The qualified person has not done sufficient work to make the resource current.

Substantial data compilation, verification, and, potentially, additional drilling and resampling would be required by a qualified person before the historical estimate could be classified as a current mineral resource. There can be no assurance that any portion of the historical mineral resource will ultimately be confirmed or demonstrated to be economically viable. For further information regarding the Berrigan Mine Project, please consult the press release dated September 13, 2023 .

Technical Disclosure The technical content of this press release has been reviewed and approved by Jean Lafleur, P.Geo., Vice President of Exploration of the Company, and Suzie Tremblay, P.Geo., Vice President of Operations at Explo-Logik Inc. and a consultant to TomaGold, each acting as a Qualified Person under National Instrument 43-101. About TomaGold TomaGold Corp. (TSXV: LOT, OTCPK: TOGOF) is a Canadian junior mining company focused on the acquisition, exploration, and development of high-potential precious and base metal projects, with a primary focus on gold and copper in Québec and Ontario. The Company’s core assets are located in the Chibougamau Mining Camp in northern Québec, where it owns the Obalski gold-copper-silver project and holds options to acquire 12 additional properties, including the Berrigan Mine, Brosnan, Radar and Dufault projects.

TomaGold also holds a 24.5% joint venture interest in the Baird gold property near the Red Lake Mining Camp in Ontario. In addition, the Company has lithium and rare earth element (REE) projects in the James Bay region, strategically positioned near significant recent discoveries. Follow TomaGold: YouTube: https://www.youtube.com/@tomagoldcorporation WhatsApp: https://www.whatsapp.com/channel/0029Vb79qG6LdQeiiErI1e27 LinkedIn: https://www.linkedin.com/company/tomagold-corporation Facebook: https://www.facebook.com/TomaGoldCorporation Instagram: https://www.instagram.com/tomagoldcorp X: https://x.com/tomagoldcorp Cautionary Statement on Forward-Looking Information This news release includes certain statements that may be deemed “forward-looking statements”.

All statements in this news release, other than statements of historical facts, that address events or developments that the Company expects to occur, are 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 may differ materially from those in the forward-looking statements.

Factors that could cause the actual results to differ materially from those in forward-looking statements include the potential results of exploration and drilling activities, market prices, continued availability of capital and financing, and general economic, market or business conditions. Investors are cautioned that any such statements are not guarantees of future performance and actual results or developments may differ materially from those projected in the 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 applicable securities laws, the Company undertakes no obligation to update these forward-looking statements in the event that management’s beliefs, estimates, opinions, or other factors should change. Neither TSX Venture Exchange nor its Regulations Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release. View source version on businesswire.com: https://www.businesswire.com/news/home/20260623115100/en/ David Grondin President and Chief Executive Officer (514) 583-3490 www.tomagoldcorp.com Business Wire June 23, 2026 - 4:30 AM PDT News by QuoteMedia www.quotemedia.com