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Nechalacho Basal Zone Selected for Canada Investment Summit Prospectus as Strategic Canadian Rare Earths Project

Corporate Updates

Nechalacho Basal Zone Selected for Canada

Investment Summit Prospectus as Strategic

Canadian Rare Earths Project

Toronto, Ontario--(Newsfile Corp. - September 15, 2026) -

Avalon Advanced Materials Inc.

(TSX:

AVL) (OTCQB: AVLNF) ("Avalon" or the "Company") is pleased to announce that its Nechalacho Rare

Earths Project ("Nechalacho") in the Northwest Territories has been selected for inclusion in the Canada

Investment Summit Prospectus and will be showcased by the Government of the Northwest Territories

("GNWT") as a strategic critical minerals development opportunity.

The inaugural Canada Investment Summit, hosted by the Government of Canada in partnership with

Canada's major institutional investment organizations, is bringing together global investors and

Canadian companies to highlight investment opportunities across the country. The Summit's official

prospectus features 167 investment opportunities, including 63 projects in the minerals and metals

sector, providing Nechalacho with exposure to international investors seeking opportunities across

Canada's strategic resource industries.

Nechalacho's inclusion provides an important national and international platform to showcase both the

project and the Northwest Territories' broader critical minerals potential. Premier R.J. Simpson and the

GNWT are highlighting Nechalacho as one of the territory's key resource development opportunities,

positioning the project among a select group of Canadian rare earth and critical minerals projects being

presented to global investors at the Summit.

The selection comes as governments in Canada, the United States and allied markets increasingly

focus on establishing secure, diversified supply chains for critical minerals. It also highlights the

important role the Northwest Territories can play in strengthening Canada's domestic supply of critical

minerals while creating opportunities for investment, economic development and long-term benefits for

the territory.

Nechalacho is one of Canada's most advanced undeveloped rare earth assets, benefiting from

substantial historical technical work, including a historical 2013 Definitive Feasibility Study, extensive

drilling and supporting technical studies. Avalon recently announced an updated Mineral Resource

Estimate for the Basal Zone prepared in accordance with U.S. SEC S-K 1300 requirements, providing

an updated technical foundation for the project as the Company advances its U.S. listing and capital

markets strategy.

Avalon is also advancing a Preliminary Economic Assessment intended to modernize the development

and processing approach contemplated in the historical feasibility study and evaluate the project's

economics. The work forms part of Avalon's broader strategy to advance Nechalacho toward

development while evaluating potential processing pathways, strategic partnerships and financing

opportunities.

Avalon believes Nechalacho's scale, advanced technical foundation, exposure to both light and heavy

rare earth elements and location within a stable Canadian jurisdiction position the project as a

compelling opportunity within North America's critical minerals industry.

About Avalon Advanced Materials Inc.

Avalon Advanced Materials Inc. is a Canadian critical minerals company focused on advancing lithium

and rare earth elements—two of the fastest-growing segments of the global energy transition. The

Company is developing strategic assets to participate in high-growth markets and support the build-out

of secure North American supply chains. Avalon is advancing the Nechalacho Rare Earth Elements and

Zirconium Project in the Northwest Territories, which contains all light and heavy rare earth elements, as

well as zirconium, tantalum, and niobium—critical minerals used in advanced technologies across the

communications, defense, advanced technologies, and energy sectors. The Company is also focused

on vertically integrating the Ontario lithium supply chain through the development of Lake Superior

Lithium Inc., Ontario's first midstream lithium hydroxide processing facility, located in Thunder Bay. This

facility is expected to serve as a cornerstone of North America's integrated battery materials supply

chain, transforming northern Ontario lithium into essential inputs for transportation, grid storage, and

advanced manufacturing.

For further information regarding Avalon Advanced Materials Inc., please visit

www.avalonadvancedmaterials.com

, email

[email protected]

, or call 416-364-4938.

Cautionary Statement Regarding Forward-Looking Information

This news release contains "forward-looking information" within the meaning of applicable Canadian

securities legislation. Generally, forward-looking information can be identified by the use of forward-

looking terminology such as "add" or "additional", "advancing", "anticipates" or "does not anticipate",

"appears", "believes", "can be", "conceptual", "confidence", "continue", "convert" or "conversion",

"deliver", "demonstrating", "estimates", "encouraging", "expand" or "expanding" or "expansion",

"expect" or "expectations", "forecasts", "forward", "goal", "improves", "increase", "intends",

"justification", "plans", "potential" or "potentially", "promise", "prospective", "prioritize", "reflects",

"robust", "scheduled", "suggesting", "support", "top-tier", "updating", "upside", "will be" or "will

consider", "work towards", or variations of such words and phrases or state that certain actions, events

or results "may", "could", "would", "might", or "will be taken", "occur", or "be achieved".

Forward-looking information is subject to known and unknown risks, uncertainties and other factors

that may cause the actual results, level of activity, performance or achievements of the Company to

be materially different from those expressed or implied by such forward-looking information, including

those risk factors discussed or referred to in the annual information form of the Company dated

November 26, 2025 (the "AIF") under the heading "Description of the Business - Risk Factors".

Forward-looking information is based on the reasonable assumptions, estimates, analysis and

opinions of management made in light of its experience and perception of trends, current conditions

and expected developments, as well as other factors that management believes to be relevant and

reasonable in the circumstances at the date that such statements are made, but which may prove to

be incorrect. Although the Company believes that the assumptions and expectations reflected in such

forward-looking information are reasonable, undue reliance should not be placed on forward-looking

information because the Company can give no assurance that such expectations will prove to be

correct. Although the Company has attempted to identify important factors that could cause actual

results to differ materially from those contained in forward-looking information, there may be other

factors that cause results not to be as anticipated, estimated or intended. There can be no assurance

that such information will prove to be accurate, as actual results and future events could differ

materially from those anticipated in such information. Accordingly, readers should not place undue

reliance on forward-looking information. The Company does not undertake to update any forward-

looking information, except in accordance with applicable securities laws.

To view the source version of this press release, please visit

https://www.newsfilecorp.com/release/314482