Western Copper Formally extends Investor Rights with Mitsubishi Materials

Press Release

May 28, 2025

Vancouver, B.C. 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

For more information, please contact:

Cameron Magee
Director, Investor Relations & Corporate Development
Western Copper and Gold Corporation
437-219-5576 or cmagee@westerncopperandgold.com

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