Brunswick Exploration Reports More High-Grade Cesium and Lithium Values at Anatacau Main

Rhea-AI Summary

Brunswick Exploration (OTCQB: BRWXF) reported final results from its inaugural Anatacau Main drilling campaign in Quebec, with six holes totaling 795 m. Key intercepts include 1.53% Li2O over 53.9 m (AN-25-04 at 23.7 m vertical) and 1.31% Li2O over 120.7 m (AN-25-05). Additional highlights: 1.58% Li2O over 22.0 m (AN-25-01) and a high cesium value of 1.10% Cs2O over 1.4 m (AN-25-04).

The mapped dykes cover about 240 m by 120 m and extend to 103 m vertical; true thickness is estimated at 65–85%. Follow-up drilling, geometallurgical DMS work at SGS, and further exploration plans are planned for early 2026.

Positive

• Intercept of 1.53% Li2O over 53.9 m (AN-25-04)
• Long intercept of 1.31% Li2O over 120.7 m (AN-25-05)
• High cesium value of 1.10% Cs2O over 1.4 m
• All six holes intercepted multiple mineralized pegmatites

Negative

• Total drilling only 795 m, limiting immediate resource confidence
• True thickness uncertainty estimated at 65–85%, affecting grade thickness certainty

News Market Reaction

-0.83%

1 alert

-0.83% News Effect

On the day this news was published, BRWXF declined 0.83%, reflecting a mild negative market reaction.

Data tracked by StockTitan Argus on the day of publication.

Key Figures

Li2O grade: 1.53% Li2O over 53.9 m Li2O grade: 1.58% Li2O over 22.0 m Cs2O grade: 1.10% Cs2O over 1.4 m +5 more

8 metrics

Li2O grade 1.53% Li2O over 53.9 m Drill hole AN-25-04 at 23.7 m vertical depth

Li2O grade 1.58% Li2O over 22.0 m Drill hole AN-25-01 at 14.2 m vertical depth

Cs2O grade 1.10% Cs2O over 1.4 m Secondary dyke in drill hole AN-25-04

Li2O interval 1.31% Li2O over 120.7 m Main pegmatite core in drill hole AN-25-05

Drilling total 795 m Six diamond drill holes in inaugural Anatacau campaign

Dyke footprint 240 m by 120 m Area covered by three continuous mineralized dykes

Vertical extent 103 m Vertical depth to which dykes are traced

True thickness range 65–85% Estimated true thickness of mineralized intervals

Market Reality Check

Price: $0.2623 Vol: Volume 61,500 vs 181,503 ...

low vol

$0.2623 Last Close

Volume Volume 61,500 vs 181,503 20-day average (relative volume 0.34x) suggests a modest participation move. low

Technical Price 0.1101 is trading above the 200-day MA at 0.10, indicating an improving longer-term trend before this news.

Peers on Argus

Peers showed mixed moves: AZZTF +14.34%, MAXXF -7.01%, while others were flat to...

Peers showed mixed moves: AZZTF +14.34%, MAXXF -7.01%, while others were flat to modestly positive. With no momentum scan hits and no same-day peer headlines, the +11.48% move in BRWXF appears stock-specific to the Anatacau drilling results.

Historical Context

5 past events · Latest: Dec 01 (Positive)

Pattern 5 events

Date	Event	Sentiment	Move	Catalyst
Dec 01	Drill results Anatacau	Positive	-0.8%	Final Anatacau drilling results with multiple high-grade Li2O and Cs2O intercepts.
Nov 24	Saudi exploration license	Positive	+12.8%	Award of Saudi hard-rock lithium exploration license and 2026 work plans.
Nov 17	Initial Anatacau results	Positive	+3.3%	Inaugural Anatacau drilling with 47.2 m at 1.66% Li2O within 120.7 m.
Sep 29	Greenland pegmatite finds	Positive	+4.7%	Additional spodumene pegmatite discoveries at Paamiut in Greenland.
Jun 18	Greenland campaign launch	Positive	+10.1%	Launch of extensive multi-area lithium exploration campaign across Greenland.

Pattern Detected

Exploration and discovery news has usually seen positive price reactions, with this Anatacau update being a rare divergence where strong drill results coincided with a mildly negative next-day move.

Recent Company History

This announcement continues a series of exploration-focused updates for Brunswick Exploration. Over the last six months, the company reported new spodumene pegmatites in Greenland (Jun 18 and Sep 29), strong inaugural Anatacau drill results on Nov 17, and a Saudi Arabian lithium exploration license on Nov 24. Most of these events led to positive price reactions, reinforcing a pattern of constructive responses to discovery and expansion news, even though the Dec 01 Anatacau results saw a slight 24-hour pullback.

Market Pulse Summary

This announcement details final results from the inaugural Anatacau Main drilling, including thick n...

Analysis

This announcement details final results from the inaugural Anatacau Main drilling, including thick near-surface pegmatites grading up to 1.53% Li2O over 53.9 m and high cesium values up to 1.10% Cs2O. The mapped dykes span roughly 240 m by 120 m and extend to 103 m depth, with follow-up work and geometallurgical DMS studies planned into 2026. Investors may track upcoming Mirage maiden resources, additional Anatacau drilling plans, and how new results compare with earlier November disclosures.

Key Terms

li2o, ta2o5, pegmatite, dense media separation, +1 more

5 terms

li2o technical

"Highlights include: 1.53% Li2O over 53.9 meters in drill hole AN-25-04..."

Li2O (lithium oxide) is a chemical compound made of lithium and oxygen, commonly encountered as a white solid used in the production of lithium-based ceramics, glass and as an intermediate in battery material processing. For investors, Li2O is important because it represents a measurable form of lithium content and feedstock in the battery supply chain—think of it as a raw ingredient whose availability, price and purity can affect costs and production for companies making batteries and electric vehicles.

ta2o5 technical

"Hole ID | From | To | Length (m) | Li2O (%) | Ta2O5 (ppm) | Cs2O (%)"

Ta2O5 is the chemical formula for tantalum pentoxide, a hard, heat-resistant oxide of the metal tantalum used as an insulating and coating material in electronics and optics. Investors pay attention because it’s a key raw material for components like capacitors and certain semiconductor or optical coatings—so changes in its supply, price, or regulations can affect manufacturing costs, product performance and the profitability of companies that rely on it, much like oil matters to carmakers.

pegmatite technical

"multiple, thick richly mineralized pegmatites alongside among the highest value cesium..."

A pegmatite is a type of coarse‑grained igneous rock that forms when the last, water‑rich portion of magma cools, often producing very large mineral crystals like a batch of cookie dough with oversized chocolate chips. It matters to investors because pegmatites frequently host concentrations of valuable and strategic minerals (for example lithium, tantalum, and rare earth elements), making them prime exploration targets and potential sources of high‑value mining projects that can affect commodity supply and company valuations.

dense media separation technical

"geometallurgical study focusing on lithium mineralization is underway at SGS using DMS (Dense Media Separation)..."

Dense media separation is a mineral-processing method that mixes mined rock with a heavy liquid so less-dense material floats and denser material sinks, allowing a physical sorting of ore from waste much like dropping stones into syrup where heavier ones sink. For investors, it matters because the technique affects how much saleable product a mine produces, the costs and energy use of processing, and environmental controls — all of which influence profitability and capital needs.

spodumene-bearing technical

"intercepted multiple spodumene-bearing pegmatites traced over 170 m strike..."

A spodumene-bearing rock or deposit contains significant amounts of spodumene, a mineral that is a major source of lithium used in batteries. For investors, spotting spodumene-bearing deposits is like finding fruit trees in an orchard: it signals a potential supply of a valuable raw material that can drive mining project value, affect lithium prices, and influence makers of electric vehicles and battery technologies.

AI-generated analysis. Not financial advice.

MONTREAL, Dec. 01, 2025 (GLOBE NEWSWIRE) -- Brunswick Exploration Inc. (TSX-V: BRW, OTCQB: BRWXF; “BRW” or the “Company”) is pleased to announce more results from its inaugural drilling campaign at the Anatacau Main Project, located in the Eeyou Istchee-James Bay region of Quebec. All results have now been received and cement BRW’s latest discovery within its growing portfolio as a high priority target for follow-up drilling.

Highlights include:

• 1.53% Li2O over 53.9 meters in drill hole AN-25-04 at a vertical depth of 23.7 meters.
• 1.58% Li2O over 22.0 meters in drill hole AN-25-01, at a shallow vertical depth of 14.2 meters.
• More high cesium values intercepted in another secondary sub-parallel dyke reaching 1.10% Cs2O on 1.4 meter.
  
  

Mr. Killian Charles, President and CEO of BRW, commented: “These results continue to underscore the significant exploration potential at the Anatacau Main. All drill holes have returned multiple, thick richly mineralized pegmatites alongside among the highest value cesium values reported in the James Bay. The targets at Anatacau remain open in all directions and will be the focus of more work in early 2026 to fully delineate this rapidly growing discovery.”

Mr Charles continued: “Prior to the start of a second phase of drilling at Anatacau, BRW will be releasing its maiden resource estimate for the wholly owned Mirage project. This important milestone is expected to be disclosed within the next four weeks.”

Table 1: Complete Mineralized Intercepts from Inaugural Drilling Program at Anatacau Main

Hole ID	From	To	Length (m)	Li2O (%)	Ta2O5 (ppm)	Cs2O (%)
AN-25-01	10.0	11.1	1.1	1.21	158	0.03
and	22.1	44.1	22.0	1.58	110	0.04
and	60.0	62.6	2.6	1.09	101	0.05
and	66.7	67.8	1.1	0.84	82	0.04
and	73.2	74.0	0.8	1.33	160	0.03
and	114.7	116.3	1.7	0.92	256	0.10
*AN-25-02	11.6	17.3	5.7	1.16	79	0.05
and	25.0	66.4	41.5	1.51	93	0.04
and	71.3	80.5	9.2	1.13	72	0.04
*AN-25-03	6.0	7.0	1.0	0.85	75	0.04
and	13.6	19.1	5.5	1.88	94	0.03
and	27.3	32.9	5.7	1.49	105	0.07
and	53.6	55.7	2.1	0.29	455	1.06
and	71.0	78.9	8.0	1.67	86	0.03
and	94.2	125.7	31.5	1.22	60	0.04
AN-25-04	3.3	15.1	11.8	0.72	212	0.18
incl.	5.0	6.4	1.4	0.30	430	1.10
and	36.8	90.7	53.9	1.53	143	0.06
incl.	36.8	47.0	10.2	1.44	175	0.06
incl.	54.0	90.7	36.7	1.81	158	0.04
and	95.7	96.8	1.1	0.05	549	0.01
*AN-25-05	30.3	151.0	120.7	1.31	112	0.09
incl.	91.6	93.9	2.4	0.13	447	0.35
incl.	102.9	150.0	47.2	1.66	142	0.05
*AN-25-06	102.8	116.8	14.0	1.42	94	0.06
and	120.4	129.2	8.8	1.33	99	0.05
and	133.0	135.1	2.1	0.80	213	0.06
and	139.8	141.2	1.4	1.77	125	0.03
and	143.5	147.0	3.5	1.45	72	0.05

True thickness is estimated between 65% and 85%

*Previously disclosed

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

Interpretation

The mineralized pegmatites discovered at Anatacau are near surface and remain open in all directions. Three large continuous dykes are drill traced and encompass an area of 240 meters long by 120 meters wide, and extending to a vertical depth of 103 meters. The main mineralized pegmatite consists of a high-grade, thick core as intersected in drill holes AN-25-04 and -05 with result of 1.53% Li2O over 53.9 meters and 1.31% Li2O over 120.7 meters.

Several other pegmatite dykes were intersected in drill hole AN-25-04, including a rich intercept of 1.44% Li2O over 10.2 meters. Importantly, this hole collared in mineralized pegmatite which further highlights the potential for more dyke stacking towards the northwest of the outcrop (Figure 1 and 2). Stacking is also recorded in drill hole AN-25-01 in which several mineralized pegmatite dykes are intersected after the main pegmatite dyke interval (Figure 3) indicating significant opportunities for continued mineralization at depth where the smaller dykes could connect at depth.

Additionally, several dykes with medium-grade mineralization (<1.5% Li2O) are developed within the deformation zone (AN-25-01, from 72.5 to 118 meters; and AN-25-03 from 108.6 to 143 meters). This suggest the mineralized dykes are not restricted to the southern side of the deformation zone and could extend beyond it to the north-east, significantly expanding the mineralized footprint of the discovery at Anatacau Main.

Based on this interpretation, BRW is confident that the dykes continue on both sides of the deformation zone, as well as at depth. The mapped dykes are distributed en echelon at a steep angle to the major east-west deformation corridor, along which other significant dykes could occur.

Some pegmatite intervals with low-grade lithium mineralization also demonstrate very high values of tantalum and cesium (up to 1.10% Cs2O in a 1.4 meter interval, AN-25-04). Further study will include rock sampling and thin sections to determine the Cs and Ta-bearing minerals at Anatacau and determine their occurrence.

Follow-up exploration plans for Anatacau Main will be released in early Q1. Furthermore, a geometallurgical study focusing on lithium mineralization is underway at SGS using DMS (Dense Media Separation) with results expected early in 2026.

Figure 2: Cross Section A-A’ (see Figure 1 for Location, Section is 65 meters thick)

Figure 3: Cross Section B-B’ (see Figure 1 for Location)

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

Drill hole	Azimut	Dip	Length (m)	UTM X	UTM Y
AN-25-01	78	-49	126	380436.08	5784638.25
AN-25-02	78	-72	93	380436.08	5784638.25
AN-25-03	98	-50	144	380384.73	5784678.00
AN-25-04	122	-49	108	380384.42	5784599.78
AN-25-05	136	-50	159	380329.20	5784591.66
AN-25-06	136	-50	165	380232.46	5784553.73

Anatacau Drilling Campaign Overview

Six diamond drill holes were completed (see Figure 1 and Table 2) for a total of 795 meters. The holes were spaced by 55 to 100 meters, and all holes intercepted mineralized pegmatites. The longest hole drilled to date is AN-25-06 at 165 meters and intercepted mineralized pegmatites up to the end.

The aim of the 2025 drilling campaign was to test at shallow depths (less than 150 meters vertical depth) the pegmatite dykes mapped at surface on the Anaïs showing. The drilling campaign was performed in HQ size to perform a geometallurgical study, planned according to a grant from the Ministry of Natural Resources and Forests of the Quebec Government.

About the Anatacau Project

The Anatacau Main and the Anatacau West Projects are under option from Osisko GP, a subsidiary of Osisko Development whereby BRW can earn a 90% interest in the projects. For further details, please refer to the November 28, 2022 News release.

QAQC

All drill core samples were collected under the supervision of BRW employees and Explo-Logik services contractor 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.

The project is under the direction of Crystal Brochard (P.Geo.), BRW Project Manager for Anatacau Main.

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

BRW is a Montreal-based mineral exploration company focused on grassroots exploration for lithium, a critical metal necessary to global decarbonization and energy transition. The Company is rapidly advancing its extensive portfolio of grassroots lithium properties and projects in Quebec (Mirage and Anatacau), Greenland (Nuuk Lithium) and the Kingdom of Saudi Arabia.

Investor Relations/information

Mr. Killian Charles, President and CEO (info@brwexplo.ca)

Cautionary Statement on Forward-Looking Information

This news release contains "forward-looking information" within the meaning of applicable Canadian securities legislation based on expectations, estimates and projections as at the date of this news release. Forward-looking information involves risks, uncertainties and other factors that could cause actual events, results, performance, prospects and opportunities to differ materially from those expressed or implied by such forward-looking information. Factors that could cause actual results to differ materially from such forward-looking information include, but are not limited to, delays in obtaining or failures to obtain required governmental, environmental or other project approvals; uncertainties relating to the availability and costs of financing needed in the future; changes in equity markets; inflation; fluctuations in commodity prices; delays in the development of projects; the other risks involved in the mineral exploration and development industry; and those risks set out in the Corporation’s public documents filed on SEDAR at www.sedar.com. Although the Corporation believes that the assumptions and factors used in preparing the forward-looking information in this news release are reasonable, undue reliance should not be placed on such information, which only applies as of the date of this news release, and no assurance can be given that such events will occur in the disclosed time frames or at all. The Corporation disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, other than as required by law. Neither the TSX Venture Exchange nor its Regulation 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.

Photos accompanying this announcement are available at:

https://www.globenewswire.com/NewsRoom/AttachmentNg/e5997d81-a466-4455-8066-50f1cbbb49a5

https://www.globenewswire.com/NewsRoom/AttachmentNg/27287664-3861-4b8c-888e-fb18a079d072

https://www.globenewswire.com/NewsRoom/AttachmentNg/f2447c8b-1e6a-4943-8309-5e98985adacb

FAQ

What lithium intercepts did Brunswick report at Anatacau Main (BRWXF) on Dec 1, 2025?

Key intercepts include 1.53% Li2O over 53.9 m (AN-25-04) and 1.31% Li2O over 120.7 m.

How much drilling was completed at Anatacau Main in Brunswick's 2025 program (BRWXF)?

Six diamond holes for a total of 795 metres were completed in the inaugural campaign.

Did Brunswick report any high-value cesium at Anatacau Main (BRWXF)?

Yes; the release lists a high cesium intercept of 1.10% Cs2O over 1.4 m in AN-25-04.

How deep and large is the mapped mineralized zone at Anatacau Main (BRWXF)?

Mapped dykes trace about 240 m by 120 m and extend to a vertical depth of 103 m.

What next steps did Brunswick announce for Anatacau and timing (BRWXF)?

Brunswick plans follow-up drilling and released that a geometallurgical DMS study at SGS and further exploration plans are expected in early 2026.

Does Brunswick have a resource estimate for Anatacau Main (BRWXF)?

No maiden resource for Anatacau was announced; the company said a maiden resource for Mirage is expected within about four weeks.