Brunswick Exploration Inc. (TSX-V: BRW) (OTCQB: BRWXF) (FRANKFURT:1XQ) is pleased to announce final assay results from the 2026 Winter drilling campaign at the Anatacau Main Project. Today’s results once again highlight the excellent lateral continuity of the main Anais dyke, with step-out drilling intersecting multiple large, well-mineralized pegmatites.

Highlights include:

• The largest pegmatite, the Anais Main dyke, remains open in all directions after another step-out hole intercepted 1.13% Li₂O over 27.4 meters in AN-26-12 at very shallow depths.
• The mineralized dyke system has been delineated over an area of approximately 350 meters wide by 600 meters long, and the system remains open in all directions.
• Significant opportunity to expand mineralization in further drilling planned in late Q3.

Mr. Killian Charles, President and CEO of BRW, commented: “Anatacau is rapidly shaping up to be one of the most exciting new discoveries in the James Bay region. After every drilling campaign at Anatacau, we continue to grow the footprint of the pegmatite dyke system with several intervals occurring over substantial widths, highlighting the scale and exploration potential of Anatacau. We now strongly believe that Anatacau is starting to show the same potential as our Mirage project. This unique combination of two highly promising projects demonstrates BRW ability to continue to make impactful discoveries across its portfolio. We look forward to returning to Anatacau in late Q3-2026 following the completion of our forthcoming drill campaign at Mirage.”

Table 1: Mineralized Highlights from All Drilling at Anatacau Main

The true thickness of the Anais dyke is estimated to be approximately 70%.

*Previously reported intercept

Geology Overview

The area surrounding the Anais Main dyke forms an extensive mineralized system that has now been drill-traced over more than 350 meters by 600 meters. The mineralized system is mostly hosted within highly folded and sheared mafic-volcanic and metasedimentary rocks. Drilling in the area has consistently intersected high grade lithium mineralization and, in some cases, also intersected pegmatites highly enriched in cesium and tantalum, with all types of mineralization occurring over substantial widths (Figure 1).

Within this rapidly growing system, seven mineralized dykes exceeding 10 meters in width have been identified with the largest being the Anais Main dyke. All intersected mineralized pegmatites remain open in all directions.

The Anais Main dyke is interpreted to be gently folded, oriented North-South to Northeast-Southwest, dipping at 85° to the West. To date, this dyke measures 350 meters along strike to a vertical depth of 200 meters and a width of approximately 40 meters.

The surrounding several mineralized dykes are interpreted to be stacked, subparallel, and steeply dipping toward the west, and are all hosted within the same structural corridor that hosts Rio Tinto’s Galaxy Project (54.3 Mt M&I at 1.30% Li₂O and 55.9 Mt Inferred at 1.29% Li₂O, see Note) and BRW’s Anatacau West Project, which is immediately contiguous to Rio Tinto’s claim package and located approximately 20 kilometers west of the Anais Main dyke (Figure 3).

Discussion of Results

Hole AN-26-12 collared into a mineralized pegmatite and intersected six well-mineralized, stacked pegmatite dykes, including a continuous interval of lithium mineralization of 27.4 meters grading 1.13% Li₂O at a very shallow vertical depth of 90 meters (Figure 2). This interval appears to correlate with the Anais Main dyke, located approximately 80 meters to the Northeast, which has now been continuously intersected over large widths by drilling over a strike length of 350 meters.

Holes AN-26-11 and AN-26-13 were drilled in a wide fence pattern, to evaluate the extreme eastward extension of the mineralized system. It was interpreted that both holes were drilled outside of the deformation corridor which hosts mineralization at Anatacau. Nonetheless, the holes still intersected several highly fractioned pegmatites. While no significant lithium values were reported, assays returned elevated cesium and tantalum values which, when combined with low K/Rb ratios in the pegmatites, confirms that the pegmatite system remains fractionated even outside the structural corridor significantly expanding the exploration potential surrounding the Anais Main dyke area.

Next Steps

The Company has now reported all results from its 2026 winter drilling campaign, which comprised seven drill holes totaling over 1,800 meters. Following these encouraging drilling results, the Company is now planning further drilling in late Q3-2026 following a drilling campaign at Mirage.

Figure 1: Surface Map of the Anatacau Main Project and Drill Holes Completed

Figure 2: Cross Section C-C’ (see Figure 1 for Location)

Figure 3: Regional Map of the Anatacau Main and Anatacau West Projects

Table 2: Drill Hole Collars (UTM Nad83, Zone 18N)

Note

SEC Technical Report Summary for the James Bay Lithium Project prepared by SLR Consulting (Canada), Wave International Pty and WSP Canada for Arcadium Lithium Plc., dated August 31, 2023.

QAQC

All drill core samples were collected under the supervision of BRW 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 cutoff grade of 0.30% Li2O.

Qualified Person

The scientific and technical information contained in this press release has been reviewed and approved by Mr. François 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-V 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 52.2Mt grading 1.08% Li2O.