Mr. Killian Charles reports

BRUNSWICK EXPLORATION INTERCEPTS 202 METRE-WIDE SPODUMENE-BEARING PEGMATITE INTERVAL AT THE ANATACAU MAIN PROJECT

Brunswick Exploration Inc. has released the results of a drill hole that represents an exceptional and material expansion to the Anais dike at the Anatacau Main project, located 20 kilometres east of Rio Tinto's Galaxy project, in the Eeyou Istchee James Bay region of Quebec. This hole is part of the 2026 summer drill campaign, which is still continuing at the Anatacau Main project.

Significant highlights of drill hole AN-26-15:

• The hole's intercept of 202 metres of spodumene-bearing pegmatites containing, on average, an estimated 25 per cent spodumene extends the Anais dike to a vertical depth of 300 metres.
• This represents the single largest pegmatitic intercept drilled by Brunswick Exploration across its portfolio and is one of the largest mineralized intercepts reported in the James Bay amongst lithium-focused companies.
• The Anais dike remains open in all directions and is significantly expanded following this drill hole. At this time, Brunswick Exploration believes there is considerable potential to continue expanding this discovery.
• The drill hole also encountered several other spodumene-bearing pegmatite intervals, separate from the 202-metre intercept, with widths of up to 21.3 metres, containing between 20 per cent and 35 per cent spodumene.
• Assays are pending and will be released as quickly as possible.

The Anatacau project is strategically located approximately 440 kilometres north of Matagami by road, whereas PMET Resources' Shaakichiuwaanaan project is 840 kilometres away and WhiteRock's Banana project is 1,060 kilometres away.

Killian Charles, president and chief executive officer of Brunswick Exploration, commented: "While it is atypical for us to release mineralized intervals without assays, we believe the size of this major interval and its implication for the Anatacau Main project is highly material to Brunswick Exploration shareholders as it instantly elevates the Anais dike to being one of the most exciting discoveries globally. Importantly, this discovery remains open in all directions. We are actively drilling at Anatacau and look forward to expanding this discovery. More details from future work programs at Anatacau will be shared shortly."

Mr. Charles continued: "Of note, we will be also releasing exciting assays from Mirage in the coming weeks. It is once more an affirmation of our strong exploration focus as we continue to expand our portfolio. Brunswick Exploration has now made two sizable discoveries, Mirage and Anatacau, and sees more opportunity in Greenland, the Middle East and further abroad."

Discussion of results

To date, a total of two holes totalling approximately 800 metres have been drilled in the Anais sector, with all assay results pending.

Hole AN-26-15 targeted the Anais Main dike in a large, downdip, 130-meter stepout and returned three major pegmatitic intervals (8.35 metres, 21.50 metres and 202.45 metres), confirming the Anais Main dike to a vertical depth of 300 metres. This 202-metre intercept also confirms that the dikes at Anatacau significantly increase in size at depth, where it remains highly mineralized, with up to 35 per cent fine-grained to coarse-grained spodumene crystals. Visual mineralization over the whole interval is estimated at approximately 25 per cent and the dikes are hosted in mafic volcanic unit. This new interpretation of thickening mineralized dikes at depth is also reflected in the relationship between holes AN-26-09 (36 metres at 1.08 per cent Li2O (lithium oxide)) and AN-26-10 (9.9 metres at 0.58 per cent Li2O and eight metres at 0.59 per cent Li2O) (see press release of May 11, 2026).

Hole AN-26-15 also extends the Anais Main dike footprint to the west, which is now traced over 650 by 350 metres and remains open in all directions.

The thickening of the pegmatitic intrusions at depth will be tested by hole AN-26-16 (in progress), which is targeting the downdip extension of the dikes intercepted in AN-26-08 (123 metres at 0.72 per cent Li2O; see press release of May 11, 2026).

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 will be performed by Agat Laboratories. Samples will be 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 Agat method 201378.

Qualified person

The scientific and technical information contained in this press release has been reviewed and approved by Simon T. Hebert, vice-president, development. 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 estimate in the Americas, with 52.2 million tonnes grading 1.08 per cent Li2O.

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