Mr. Killian Charles reports

BRUNSWICK EXPLORATION DRILLS 36 METERS AT 1.51% AND CONTINUES TO EXTEND THE MINERALIZED FOOTPRINT OF MIRAGE

Brunswick Exploration Inc. has released the first results from the 2025 Mirage winter drilling campaign, where it drilled an additional 24 holes targeting extensions of known mineralized zones. The Mirage project is located in the Eeyou Istchee-James Bay region of Quebec, approximately 40 kilometres south of the Trans-Taiga Road. This release focuses on the Central zone, including the MR-6 and MR-3 dikes and the stacked dike area, where Brunswick Exploration has continued to intersect wide and well mineralized intervals along strike and at depth.

Highlights include:

• Significant interval of 36 metres at 1.51 per cent Li2O (lithium oxide) in hole MR-24-102 within the stacked dike area extending mineralization to the southeast and where an additional 13 dikes measuring between 1.3 metres and 9.35 metres were intercepted in the same hole;
• New interval at the MR-6 dike with 1.32 per cent Li2O over 28 metres in hole MR-24-101, extending the dike to the northwest;
• The MR-3, MR-6 and stacked dike system can now be traced together into a major swarm of spodumene-bearing pegmatites covering a surface area of over 1,000 metres by up to 450 metres;
• A total of 24 drill holes prioritizing near-surface mineralization in the extension of the stacked dike area were completed during the winter; assays are pending for a further 16 holes.

Killian Charles, president and chief executive officer of Brunswick Exploration, commented: "To date, every drill campaign has demonstrated the significant exploration upside at Mirage and these first results from our winter 2025 campaign are no different. We have successfully extended the MR-6 pegmatite and continue to rapidly add considerable intercepts in the neighbouring stacked dike area. Interestingly, this high-potential target area has continued to return multiple significant mineralized intercepts over the entirety of each drill hole and the stacked dike area remains open in multiple directions.

"Brunswick Exploration remains one of the most active lithium exploration companies globally and looks forward to releasing more drill results from Mirage and the restart of prospecting in Greenland. With its unique portfolio, the company expects to have a milestone-rich year."

Mirage project drilling overview

The Mirage project comprises 427 claims located roughly 40 kilometres south of the Trans-Taiga Highway in Quebec's James Bay region and 34 kilometres northeast of Winsome Resources' Adina project.

The 2025 winter drilling campaign focused on extending the mineralized stacked dike area to the northeast. Highlights discussed in this release are shown in Table 1.

Holes MR-25-96 and MR-25-98 extended the MR-3 dike 150 metres to the south with 0.79 per cent Li2O over 12.2 metres from 55.8 metres to 68 metres and 1.26 per cent Li2O over seven metres from 176 metres to 183 metres. Hole MR-25-95 also confirmed the present of MR-3 and intersected a new dike from 123.9 metres to 132 metres that returned 0.76 per cent Li2O over 8.31 metres. This new shallow-dipping mineralized pegmatite is located between MR-3 and MR-6 and is open in all directions. From 290 metres to 307 metres, hole MR-25-95 also intersected three mineralized dikes that could be extensions to MR-6 at depth, dipping to the east.

Hole MR-25-102 extends the stacked dike area to the south with 14 mineralized dikes intercepted, with the largest grading 1.51 per cent Li2O over 35.65 metres from 166.6 metres to 202.25 metres. Hole MR-23-32ext was drilled to connect the stacked dike area to MR-6. Multiple dikes were intercepted in this hole and confirmed the presence of three new subhorizontal dikes under MR-6, with the largest returning 1.02 per cent Li2O over 7.75 metres from 158.25 metres to 166 metres.

Hole MR-25-101 confirmed the plunge to the north of MR-6 with an intercept of 28 metres at 1.32 per cent Li2O from 173 metres to 201 metres and extends the MR-6 pegmatite by 100 metres. The hole MR-25-99 and MR-25-100 also intercepted the MR-6 dike over 14.3 metres and 19.4 metres but showed signs of heavy alteration and no spodumene was identified.

Quality assurance/quality control

All drill core samples were collected under the supervision of Brunswick Exploration employees and contractors. The drill core was transported by helicopter and by truck from the drill platform to the core logging facility in Val d'Or. Each core was then logged, photographed, tagged and split by diamond saw before being sampled. All pegmatite intervals were sampled at approximately one-metre intervals to ensure representativity. Samples were bagged and duplicated on reject; blanks and certified reference materials for lithium were inserted every 20 samples. Samples were bagged and groups of samples were placed in larger bags, sealed with numbered tags, in order to maintain a chain of custody. The sample bags were transported from the Brunswick Exploration contractor facility to the Agat laboratory in Val d'Or. All sample preparation and analytical work was performed by Agat by sodium peroxide fusion with ICP-OES and ICP-MS finish. All results passed the QA/QC screening at the lab and all inserted standard and blanks returned results that were within acceptable limits. All reported drill intersections are calculated based on a lower cut-off grade of 0.3 per cent Li2O, with maximum internal dilution of five metres. Host basalts adjacent to the dikes may grade up to 0.3 per cent Li2O but were excluded from the reported intersections.

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 and Greenland.

We seek Safe Harbor.