Taseko Mines Commences Environmental Assessment Process for Yellowhead Copper Project

Press Release

July 8, 2025, Vancouver, BC – Taseko Mines Limited (TSX: TKO; NYSE American: TGB; LSE: TKO) (“Taseko” or the “Company”) today announced that the Initial Project Description (“IPD”) for its 100% owned Yellowhead Copper Project (“Yellowhead Project” or the “Project”) has been filed and accepted by the British Columbia Environmental Assessment Office (“EAO”) and Impact Assessment Agency of Canada (“IAAC”). The acceptance formally commences the Environmental Assessment (“EA”) process, which is designed to be comprehensive, inclusive, and transparent, ensuring that the Yellowhead Project meets the robust regulatory requirements while balancing environmental, social, and economic values.

Taseko has engaged with both the EAO and IAAC in preparation for the submission of the IPD and is committed to a high degree of public involvement and Indigenous engagement throughout the EA and permitting processes.

The Yellowhead Project is located approximately 150 kilometers north of Kamloops, BC in the territory of Simpcw First Nation (Simpcwúl’ecw), part of the Secwépemc Nation.  Since acquiring the property in 2019, Taseko has worked closely with Simpcw leadership to build a mutually beneficial relationship based on trust and respect, to better understand community priorities and interests, and to inform the Yellowhead Project IPD.  The Project will be subject to the Simpcw Process, an Indigenous-led assessment and decision-making process currently in its initial phases. Taseko and Simpcw have also signed a Relationship Negotiation Agreement, setting out an approach for the development of a Relationship Agreement that will define Simpcw’s role in project oversight and planning and establish an economic partnership between the parties. In addition to Simpcw, Taseko has established positive working relationships with several proximal Secwépemc groups.

Stuart McDonald, President & CEO commented, “The submission of the Initial Project Description represents a significant milestone for the Yellowhead Project permitting process. We have already begun to engage stakeholders and will ensure that the development of Yellowhead is in line with environmental and social expectations. Recently, Taseko has hosted a number of well attended community meetings and we look forward to continued involvement with project stakeholders and government regulators through the environmental permitting process.”

Taseko has launched a dedicated project website, yellowheadproject.com, to keep stakeholders informed about project details and status, share opportunities for feedback, and encourage participation in the EA process.

For further information on Taseko, see the Company’s website at tasekomines.com or contact:

• Investor enquiries Brian Bergot, Vice President, Investor Relations – 778-373-4554
• Media enquiries Sean Magee, Vice President, Corporate Affairs – 778-373-4543

Stuart McDonald
President and CEO

For further information on Taseko, investors should review the Company’s annual Form 40-F filing with the United States Securities and Exchange Commission www.sec.gov and home jurisdiction filings that are available at www.sedar.com, including the “Risk Factors” included in our Annual Information Form.

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