Mr. George Salamis reports

INTEGRA APPOINTS AUSENCO TO LEAD DETAILED ENGINEERING AT DELAMAR, NEPA PUBLIC SCOPING PERIOD UNDERWAY

Integra Resources Corp. has appointed Ausenco Engineering USA South Inc. as lead engineering partner for detailed engineering activities at the company's DeLamar project in southwestern Idaho. As part of the engagement, Ausenco has retained SLR Consulting (SLR), which brings specialized heap leach engineering, metallurgy and mine planning expertise to the project. The start of detailed engineering marks a significant step in project development for DeLamar and coincides with the launch of the public scoping and stakeholder engagement period of the National Environmental Policy Act (NEPA) review process.

The company announced on May 29, 2026, that the United States Bureau of Land Management (BLM) has published the notice of intent (NOI) in the federal register. The publication of the NOI started the 30-day public scoping and stakeholder engagement period of the NEPA process. Concurrent with the NEPA process, Ausenco and Integra will advance detailed engineering at DeLamar, with the final environmental impact statement (EIS) and record of decision (ROD) from the BLM anticipated in the second half of 2027.

"Entering the detailed engineering phase at DeLamar is a major milestone for the company. As one of the largest and most advanced heap leach projects currently in the NEPA process, DeLamar has the potential to drive long-term economic growth and job creation in southwestern Idaho," said George Salamis, president, chief executive officer and director of Integra. "The appointment of Ausenco strengthens the company's position to advance DeLamar as the company progresses through the NEPA process."

Cliff Lafleur, chief operating officer of Integra, commented: "We have assembled an experienced detailed engineering team led by Ausenco, which has a proven track record of executing similar mandates on open pit projects of this scale. Detailed engineering work is already under way and will continue through Q1 2027, with long-lead procurement activities beginning in the second half of this year and continuing through 2027. The detailed engineering, along with the expected receipt of the final EIS and ROD next year, will inform a construction decision for DeLamar."

Ausenco is a globally recognized engineering, consulting and project delivery firm with extensive experience in the design and construction of precious metals mining projects worldwide, including several recent North American gold and silver developments. Under the scope of work with Integra, Ausenco will lead detailed engineering and execution readiness activities for the project. These activities will include engineering design advancement, procurement planning, constructability reviews, project execution planning and support for future development activities.

SLR, which recently acquired Forte Analytical and Forte Dynamics (Forte), will focus on heap leach engineering, metallurgy and mine planning. SLR (Forte) prepared the technical report for DeLamar titled "Feasibility Study and Technical Report on the DeLamar Project, Owyhee County, Idaho, USA" dated Feb. 2, 2026, with an effective date of Dec. 8, 2025, available under Integra's SEDAR+ profile and EDGAR profile.

About Integra Resources Corp.

Integra is a growing precious metals producer in the Great basin of the Western United States. Integra is focused on demonstrating profitability and operational excellence at its principal operating asset, the Florida Canyon mine, located in Nevada. In addition, Integra is committed to advancing its flagship development-stage heap leach projects: the past-producing DeLamar project located in southwestern Idaho and the Nevada North project located in western Nevada. Integra creates sustainable value for shareholders, stakeholders and local communities through successful mining operations, efficient project development, disciplined capital allocation, and strategic M&A (merger and acquisition), while upholding the highest industry standards for environmental, social and governance practices.

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