Integra Resources Appoints Ausenco as Lead Engineering Partner as BLM Launches NEPA Review for DeLamar Project

Integra Resources has engaged Ausenco Engineering USA South Inc. as lead engineering partner for the DeLamar gold-silver project in Owyhee County, southwestern Idaho, with detailed engineering already underway and long-lead procurement commencing in the second half of 2026. Simultaneously, the Bureau of Land Management (BLM) published the Notice of Intent (NOI) in the Federal Register in May 2026, opening the 30-day public scoping period under the National Environmental Policy Act (NEPA) review process. Completion of detailed engineering, along with receipt of the final Environmental Impact Statement (EIS)and Record of Decision, is expected to inform a construction decision for DeLamar.

Company Overview

Integra Resources (TSXV : ITROTCQB : MLPMF) is a growing precious metals producer advancing the DeLamar Project, a heap leach gold-silver project located in Owyhee County, southwestern Idaho. The DeLamar Project is one of the largest and most advanced heap-leach projects currently undergoing NEPA review in the United States.

Engineering Appointment & Scope

Integra Resources has appointed Ausenco Engineering USA South Inc. as the lead engineering partner for detailed engineering activities at the DeLamar Project. Ausenco is a globally recognised engineering, consulting, and project delivery firm with experience in the design and construction of precious metals mining projects worldwide, including recent North American gold and silver developments.

Ausenco has retained SLR Consulting, bringing specialised heap-leach engineering, metallurgical, and mine-planning expertise to the project. SLR recently acquired Forte Analytical and Forte Dynamics, and it was SLR (Forte) that prepared the feasibility study technical report for DeLamar - "Feasibility Study and Technical Report on the DeLamar Project, Owyhee County, Idaho, USA," with a technical report date of February 2026 and an effective date of December 2025.

Ausenco's scope covers engineering design advancement, procurement planning, constructability reviews, project execution planning, and support for future development activities. Detailed engineering work is already underway and will continue through the first quarter of 2027, with long-lead procurement activities beginning in the second half of 2026 and continuing through 2027.

President, Chief Executive Officer, and Director of Integra Resources, George Salamis, framed the appointment within the company's broader development objectives:

"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. The appointment of Ausenco strengthens the Company's position to advance DeLamar as the Company progresses through the NEPA process."

NEPA Process Status

The start of detailed engineering coincides with the launch of the public scoping and stakeholder engagement period of the NEPA review for DeLamar. In May 2026, the United States Bureau of Land Management published the NOI in the Federal Register, opening the 30-day public scoping and stakeholder engagement period. The final EIS and Record of Decision from the BLM are anticipated in the second half of 2027.

Construction Decision Pathway

The two concurrent workstreams, detailed engineering and the NEPA review process, are progressing on parallel timelines toward a defined decision gate for DeLamar.

Chief Operating Officer of Integra Resources, Cliff Lafleur, described the schedule and its implications:

"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 underway and will continue through the first quarter of 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."

Next Steps

Detailed engineering activities at DeLamar will continue through the first quarter of 2027 under Ausenco's lead, with long-lead procurement running in parallel from the second half of 2026 through 2027. The BLM's 30-day public scoping period, initiated by the May 2026 NOI, marks the opening stage of the NEPA review process. The final EIS and Record of Decision are targeted for the second half of 2027, at which point both workstreams are expected to converge to inform a construction decision for the DeLamar Project.