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NBY.V ·

Niobay Announces the Start of Its 2025 Drill Campaign ON Its Crevier Project

Exploration Programs

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Press release

TSX-V: NBY & OTCQB: NBYCF

NIOBAY ANNOUNCES THE START OF ITS 2025 DRILL CAMPAIGN

ON ITS CREVIER PROJECT

Montréal, Québec, June 3 , 202 5 - NioBay Metals Inc. (“NioBay” or the “Company”) (TSX -V: NBY)

(OTCQB: NBYCF ) is pleased to announce the start of a drilling campaign on the Crevier property

(the “2025 Campaign”) , located approximately 50 km north of the town of Girardville and

approximately 150 km from the Niobec mine (the “Project”). It is located within the Nitassinan territory

of the Pekuakamiulnuatsh, whose main population center is Mashteuiatsh. The P roject is easily

accessible via existing logging roads.

The 2025 Campaign is made possible by a grant from the Ministère des Ressources naturelles et des

Forêts (MRNF) under the Mining Exploration Support Program for Critical and Strategic Minerals. The

drilling will be large in diameter (HQ) in order to collect a maximum quantity of material. Bulk sampling

is also planned and will be combin ed with the drill core collected to produce a sample of more than

125 metric tons, representative of the extension zones.

Figure 1: Location of 2025 drill holes

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NioBay is pleased to announce that this campaign will be carried out by the Premières Nations drilling

company in Mashteuiatsh. Geological supervision has been entrusted to the Saguenay firm IOS Services

Géoscientifiques. It should be noted that the latter was also involved in previous drilling campaigns on

this site.

Message from NioBay’s President and Chief Executive Officer on Crevier

“This campaign will allow us to recover more material than during the 2023 campaign. In addition, this

work will allow us to test the extensions of the known zone. Building on our first pilot plant, this

campaign prepares us for our next pilot plant, which will be ten times larger than the first. We will use

this second pilot plant to manufacture more product for our potential c ustomers. Once again, we are

pleased to carry out this work with the support of a local labor force, such as Forage Premières Nations

of Mashteuiatsh and IOS Services Géoscientifiques of Chicoutimi,” says Jean-Sébastien David, President

and CEO.

Qualified Person

This press release has been reviewed and approved by Jean-Sébastien David, P.Geo., a qualified person

under National Instrument 43-101. Mr. David is President and Chief Executive Officer of NioBay.

About NioBay Metals Inc.

NioBay aims to become a leader in the development of mine(s) with low carbon consumption and

responsible water and wildlife management practices while prioritizing the environment, social

responsibility, good governance, and the inclusion of all stakeholders. Our top priority, which is critical

to our success, is the consent and full participation of the Indigenous communities in whose territories

and/or on ancestral lands we operate. In addition to others properties, NioBay holds a 100% interest in

the James Bay Niobium Project located 45 km south of Moosonee, in the Moose Cree Traditional

Territory of the James Bay Lowlands in Ontario. NioBay also holds a 72.5% interest in the Crevier

Niobium and Tantalum project located in Québec and on the Nitassinan territory of the

Pekuakaminulnuatsh First Nation. The Company has also the option to acquire a 80% interest in the

Foothills project, a titanium-phosphate project located near the former St-Urbain mine site in Québec.

About Niobium

Niobium is a naturally occurrin g element. It is a metal that is ductile, malleable and highly resistant to

corrosion. Because it enhances properties and functionalities, niobium is used in a wide range of

materials and applications in the Mobility, Structural and Energy sectors. Niobium transforms materials.

When added to materials like steel, glass and aluminum castings, niobium makes them more efficient

and lowers environmental impacts, while also increased value.

Neither the TSX Venture Exchange nor its Regulation Services Provider ( as that term is defined in the

policies of the TSX Venture Exchange) accept responsibility for the adequacy or accuracy of this release.

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Cautionary Statement

Certain statements contained in this press release constitute forward- looking information under the

provisions of Canadian securities laws including statements about the Company’s plans. Such

statements are necessarily based upon a number of beliefs, assumptions, and opinions of management

on the date the statements are made and are subject to numerous risks and uncertainties that could

cause actual results and future events to differ materially from those anticipated or projected. The

Company undertakes no obligation to update these forward- looking statements in the event that

management’s beliefs, estimates or opinions, or other factors should change, except as required by

law.

FOR MORE INFORMATION, CONTACT:

NioBay Metals Inc.

Jean-Sebastien David, geo.

President & Chief Executive Officer

Tel.: 514 866-6500

[email protected]

www.niobaymetals.com

Kimberly Darlington

Investor Relations

[email protected]

Tel: 514-771-3398