Mr. Killian Charles reports

BRUNSWICK EXPLORATION DRILLS 90.5 METERS AT 1.31% LI2O AT ANATACAU PROJECT

Brunswick Exploration Inc. has released initial results from the 2026 winter drilling campaign at the Anatacau Main project, located in the Eeyou Istchee-James Bay region of Quebec. This campaign was designed to confirm the downdip and lateral extensions of the Anais Main dike at depth and extend the pegmatite trend to the east.

Highlights include:

• 1.31 per cent Li2O (lithium oxide) over 90.5 metres in drill hole AN-26-07 within a larger package of continuous lithium mineralization (present within both country rock and pegmatites) of 167.9 metres at 1.02 per cent Li2O;
• A newly discovered dike was identified below from the Anais Main dike, which measured 6.8 metres grading 1.52 per cent;
• The Anais Main dike is now defined to a vertical depth of 190 metres; it and all other dikes reported today remain open in all directions.

Killian Charles, president and chief executive officer of Brunswick Exploration, commented: "These exciting first results underscore the potential of Anatacau, a rapidly growing project in our global portfolio. We are beginning to define a sizable lithium system at Anatacau Main, which importantly remains open in all directions. The campaign is currently under way, with the aim of discovering additional large lithium pegmatites to the east. Alongside Mirage, Brunswick has two major exploration assets in the James Bay region of Quebec placing it an envious position relative to peers. I look forward to sharing more results from this exciting campaign over the coming weeks."

Anatacau geology overview

The continuity of the Anais dike at depth has been confirmed and is now defined to a maximum vertical depth of 190 metres, remaining open in all directions. The main Anais dike extends over 250 metres in strike length and the dike is interpreted to be gently folded, oriented north-south to northeast-southwest, dipping at 85 degrees to the west. It is hosted within highly folded and sheared metavolcanic rocks.

The mineralized dikes discovered at Anatacau to date straddle the southern side of an interpreted major deformation zone, striking northwest-southeast -- a structural control that is reminiscent of the Galaxy deposit. The mineralized pegmatite dikes appear to be oriented parallel to the Anais dike and intrude mostly metavolcanic rocks with one in metasedimentary rocks. This finding is significant as it confirms that mineralization is constrained to the same structural corridor that is found at Rio Tinto's Galaxy project (54.3 million tonnes measured and indicated at 1.30 per cent Li2O and 55.9 million tonnes inferred at 1.29 per cent) and Brunswick Exploration's Anatacau West project, which is immediately contiguous to Rio Tinto's claim package, located approximately 20 kilometres to the west of Anais.

Drilling at Anatacau continues to the east, where no previous drilling has been conducted, and all targets remain open. Results will be announced by Brunswick as soon as they become available.

Anatacau drilling campaign objectives

Two initial diamond drill holes were completed for a total of 582 metres and both intercepted mineralized pegmatites. Approximately 1,500 metres (of NQ core) were drilled in the winter campaign consisting of seven inclined holes averaging 200 metres each.

The priority of the 2026 drilling campaign is to expand the Anais showing, where mineralization has been intersected in all previous holes, as it remains open at depth and along strike in all directions. Several holes are also planned to the east to test the deformation corridor for further mineralized pegmatites. Brunswick Exploration discovered the Anais showing in 2023, which consists of several parallel pegmatite dikes with visible spodumene mineralization. Brunswick Exploration's previous drill campaign at Anatacau Main in 2025 revealed high-grade Li2O values of 1.53 per cent over 53.9 metres, along with high values of tantalum and cesium (see press release dated Dec. 1, 2025).

About the Anatacau project

The Anatacau Main and the Anatacau West projects are under option from Osisko GP, a subsidiary of Osisko Development, whereby Brunswick Exploration can earn a 90-per-cent interest in the projects. For further details, please refer to the Nov. 28, 2022, news release.

Quality assurance/quality control

All drill core samples were collected under the supervision of Brunswick Exploration employees and services contractor Explo-Logik, applying industry-standard QA/QC procedures to its drilling and prospecting programs. All sample preparation and analytical work was performed by Agat Laboratories. Samples were prepared with methods 200075 and 200087 and dissolved in a sodium peroxide solution, prior to multielement analysis by ICP-OES and ICP-MS, according to the Agat method 201378. All results passed the QA/QC screening at the laboratory, and all inserted standard, duplicates and blanks returned results within acceptable limits. All reported drill intersections are calculated on the basis of a lower cut-off grade of 0.30 per cent Li2O.

Qualified person

The scientific and technical information contained in this press release has been reviewed and approved by Francois Goulet, manager, Quebec. He is a professional geologist registered in Quebec and is a qualified person as defined by National Instrument 43-101.

About Brunswick Exploration Inc.

Brunswick Exploration is a Montreal-based mineral exploration company listed on the TSX Venture Exchange under symbol BRW. The company is focused on grassroots exploration for lithium in Canada, a critical metal necessary to global decarbonization and energy transition. The company is rapidly advancing the most extensive grassroots lithium property portfolio in Canada, Greenland and Saudi Arabia, underpinned by its Mirage project, one of the largest undeveloped hard-rock lithium inferred mineral resource estimates in the Americas, with 52.2 million tonnes grading 1.08 per cent Li2O.

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