WESTERN COPPER FORMALLY EXTENDS INVESTOR RIGHTS AGREEMENT WITH MITSUBISHI MATERIALS

western copper and gold corporation ("Western" or the "Company") (TSX: WRN) (NYSE American: WRN) is pleased to announce that Mitsubishi Materials Corporation ("Mitsubishi Materials") has completed the precondition for the previously announced extension of their investor rights agreement.

Mitsubishi Materials acquired two million common shares of the Company through open market purchases, taking their overall ownership to approximately 5%. Consequently, the investor rights agreement between the two groups has now been extended to May 30, 2026 , in accordance with the amended terms announced on April 15, 2025 .

"We are extremely pleased to maintain, and enhance, our relationship with Mitsubishi Materials." said Sandeep Singh , President and CEO. "They remain an incredibly supportive shareholder, and we value their expertise as we advance the Casino Project."

ABOUT western copper and gold corporation

western copper and gold corporation is developing the Casino Project, Canada's premier copper-gold mine in the Yukon Territory and one of the most economic greenfield copper-gold mining projects in the world.

The Company is committed to working collaboratively with our First Nations and local communities to progress the Casino Project, using internationally recognized responsible mining technologies and practices.

For more information, visit www.westerncopperandgold.com .

On behalf of the board,

"Sandeep Singh"

Sandeep Singh
President and CEO
western copper and gold corporation

Cautionary Note Regarding Forward-Looking Statements

This news release includes certain "forward-looking information" and "forward-looking statements" (collectively "forward-looking statements") within the meaning of applicable Canadian and United States securities legislation including the United States Private Securities Litigation Reform Act of 1995. These forward-looking statements are made as of the date of this news release. Forward-looking statements are frequently, but not always, identified by words such as "expects", "anticipates", "believes", "plans", "projects", "intends", "estimates", "envisages", "potential", "possible", "strategy", "goals", "opportunities", "objectives", or variations thereof or stating that certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved, or the negative of any of these terms and similar expressions. Such forward-looking statements herein include statements regarding the anticipated advancement of the Casino Project, the continued support and involvement of Mitsubishi Materials, and the potential benefits of the extended investor rights agreement.

Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause actual events to be materially different from those expressed or implied by such statements. Such factors include but are not limited to the risk of unforeseen challenges in advancing the Casino project, potential impacts on operational continuity, changes in general market conditions that could affect the Company's performance; and other risks and uncertainties disclosed in the Company's annual information form and Form 40-F for the most recently completed financial year and its other publicly filed disclosure documents.

Forward-looking statements are based on assumptions management believes to be reasonable, such assumptions and factors as set out herein, and in the Company's annual information form and Form 40-F for the most recently completed financial year and its other publicly filed disclosure document.

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements, other factors may cause results to be materially different from those anticipated, described, estimated, assessed or intended. These forward-looking statements represent the Company's views as of the date of this news release. There can be no assurance that any forward-looking statements will be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. The Company does not intend to and does not assume any obligation to update forward-looking statements other than as required by applicable law.

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