Avalon Appoints Vienna Psihos as Manager, Public Affairs & Government Relations

Press Release

November 18, 2025

TORONTO, ON – Avalon Advanced Materials Inc. (“Avalon” or the “Company“) (TSX: AVL and OTCQB: AVLNF) is pleased to announce the appointment of Vienna Psihos as Manager, Public Affairs & Government Relations.

Ms. Psihos brings strong experience at the intersection of government decision-making, regulatory processes, and strategic communications. Her expertise will support Avalon as it advances key critical minerals projects across Canada. Ms. Psihos holds a Bachelor of Arts in Political Science from the University of Toronto.

Most recently serving in a senior policy role within the Government of Ontario’s Treasury Board Secretariat, Ms. Psihos contributed to major provincial funding and policy decisions and supported the communications strategy for the province’s 2025–2026 Budget. Her work involved managing and evaluating large-scale funding initiatives within Ontario’s largest spending portfolios, spanning capital, operating, and program investments.

Her background also includes advising companies across Ontario’s mining and infrastructure sectors on government relations, permitting, stakeholder engagement, and strategic communications. This includes supporting high-priority initiatives for industry leaders such as Glencore Canada and Wyloo’s Ring of Fire efforts, where she worked on strategies tied to regulatory approvals, Indigenous engagement, and major project development.

“Vienna’s experience navigating government processes and funding programs, along with her work supporting major mining and infrastructure projects, aligns directly with Avalon’s strategic priorities,” said Scott Monteith, CEO of Avalon. “She will play a key role in strengthening our government relationships and enhancing the Company’s public affairs and communications efforts.”

“As governments at both the provincial and federal levels intensify their focus on building resilient, homegrown supply chains, investments like Avalon’s are precisely the kind of projects needed to advance Canada’s critical minerals strategy and presence on the global scale. I’m thrilled to join the team at such a pivotal moment of growth and momentum.” said Ms. Psihos, Avalon’s new Manager of Public Affairs & Government Relations.

About Avalon Advanced Materials Inc.

Avalon Advanced Materials Inc. is a Canadian critical minerals company advancing the supply of materials essential to a resilient North American supply chain. The Company is focused on developing strategic assets that support secure, domestic supply chains and long-term economic growth. 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 yttrium, zirconium, tantalum, and niobium—critical minerals used in advanced technologies across the communications, defense, clean tech, 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 will serve as a vital link between northern Ontario’s lithium resources and the growing EV battery manufacturing base in southern Ontario and North America. Through a joint venture with SCR Sibelco NV, Avalon is advancing the Separation Rapids Lithium Project near Kenora, Ontario, as well as continuing exploration at its Snowbank lithium and Lilypad lithium-cesium deposits.

For further information regarding Avalon Advanced Materials Inc., please visit www.avalonadvancedmaterials.com, email ir@avalonam.com, or call 416-364-4938.

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