Mr. Jason Kosec reports

INTEGRA ANNOUNCES ADDITIONAL OXIDE DRILL RESULTS FROM STOCKPILE DRILL PROGRAM AT DELAMAR, INCLUDING 0.74 G/T AUEQ OVER 53 M AND 0.53 G/T AUEQ OVER 120 M

Integra Resources Corp. has provided drill results from 21 additional drill holes, representing 1,180 metres (m), from the stockpile drill program at the DeLamar project located in southwestern Idaho.

The stockpile drill program at DeLamar was designed to test a large portion of the estimated 60 million tonnes (t) of mineralized material that was stockpiled and/or used as backfill at the project. The company believes that additional oxide-and-mixed material from the stockpiles and backfill at DeLamar has the potential to significantly increase the heap leach mine life of the project in future phases and further bolster the robust economics presented in the company's 2022 prefeasibility study (PFS).

Drilling highlights

• The latest drilling highlights from DeLamar (North DeLamar, stockpile 1 and 2) include:
  • NDM-23-046: 0.29 gram per tonne (g/t) gold (Au) and 18.72 g/t silver (Ag) (0.53 g/t gold equivalent (AuEq)) over 120.40 metres;
  • NDM-23-018: 0.22 g/t Au and 17.46 g/t Ag (0.45 g/t AuEq) over 74.68 m;
  • NDM-22-164: 0.24 g/t Au and 18.86 g/t Ag (0.48 g/t AuEq) over 47.24 m;
  • NDM-23-022: 0.26 g/t Au and 14.20 g/t Ag (0.44 g/t AuEq) over 73.15 m.
• The latest drilling highlights from Florida Mountain (Jacobs Gulch) include:
  • JG-23-080: 0.60 g/t Au and 10.50 g/t Ag (0.74 g/t AuEq) over 53.34 m, including 8.91 g/t Au and 6.55 g/t Ag (9.00 g/t AuEq) over 1.53 m;
  • JG-23-040: 0.32 g/t Au and 10.33 g/t Ag (0.46 g/t AuEq) over 32.00 m;
  • JG-23-146: 0.36 g/t Au and 6.76 g/t Ag (0.45 g/t AuEq) over 33.53 m.
• The drill results announced today continue to demonstrate excellent gold equivalent grade and drill intercept widths with strong continuity throughout the stockpile and backfill mineralized material.
• The company has released 176 drill holes of the 321 drill holes completed during the 12,588 m stockpile drill program which was completed in April, 2023.
• Integra intends to release an updated mineral resource estimate for DeLamar in Q3 2023 which will include the stockpile and backfill mineralized material. In Q4 2023, the company plans on submitting the mine plan of operations at DeLamar, which represents a major derisking milestone for the project.

Integra's president, chief executive officer and director, Jason Kosec, commented: "The drill results announced today further increase the company's confidence that the stockpile and backfill material has the potential to significantly increase the heap leach mine life of the project in future phases. For the remainder of 2023, the team remains focused on delivering two more significant milestones at DeLamar including the updated mineral resource estimate in Q3 and the submission of the mine plan of operations in Q4."

Detailed drill results

The attached table highlights selected intercepts from the DeLamar backfill and stockpile drill program announced today (1) (2) (3) (4).

The attached table highlights selected intercepts from the Florida Mountain backfill and stockpile drill program announced today (1) (2) (3).

The Jacobs Gulch stockpile cross-section illustrates strong grade continuity and consistent grades above the heap leach cut-off grade, demonstrating the potential for this material to increase the heap leach mine life in future phases. The Jacobs Gulch stockpile is estimated to contain approximately 8.9 million t of the approximate 60 million t of mineralized material that was stockpiled and/or used as backfill by previous operators. Drill spacing is completed at 60 m with some areas drilled at 30 m spacing to further confirm continuity. The stockpile drilling, along with additional drilling that occurred after the last mineral resource estimate cut-off date, will be included in an updated mineral resource estimate at the project in Q3 2023.

Cyanide shake analysis is not performed on Florida Mountain samples as gold occurrences in Florida Mountain material can often be coarse in nature, making comparisons between cyanide shake analyses and fire assays unreliable. Once pulverized, as per any cyanide shake procedure, all Florida Mountain material shows high recoveries by cyanidation, rendering cyanide shake analysis unreliable for differentiating between ores that can be heap leached and those requiring grinding to achieve high recoveries.

Sampling and quality assurance/quality control procedure

Thorough QA/QC protocols are followed on the project, including insertion of duplicate, blank and standard samples in the assay stream for all drill holes. The samples are submitted directly to American Assay Labs in Reno, Nev., for preparation and analysis. Analysis of gold is performed using fire assay method with atomic absorption (AA) finish on a one-assay-ton aliquot. Gold results over five g/t are rerun using a gravimetric finish. Silver analysis is performed using inductively coupled plasma for results up to 100 g/t on a five-acid digestion, with a fire assay, gravimetric finish for results over 100 g/t silver.

Execution of drill program -- methodology

The stockpile drill program was executed at 60 m collar spacings with select 30 m infill test holes to further verify grade variability in future resource estimation and to provide additional metallurgical samples. All drilling was vertical through the entirety of the stockpiles and backfill material. The drilling was conducted by a combination of sonic and traditional reverse circulation (RC) with casing advance drilling methods. Both these drilling methods maintain high sample quality and integrity throughout the drilling process. Additionally, the two drilling methods provided a basis for continuity comparison. Sampling was conducted at 1.5 m intervals for the whole of the drilling program with all samples sent to a third party lab for analysis. The sonic drilling provided material suitable for continuing comprehensive metallurgical test work.

Qualified person

The scientific and technical information contained in this news release has been reviewed and approved by Raphael Dutaut, PhD (PGeo), Integra's vice-president, exploration, and Tim Arnold (PE, SME), Integra's chief operating officer. Both individuals are qualified persons (QP) as defined in National Instrument 43-101 -- Standards of Disclosure for Mineral Projects.

DeLamar project overview

The past-producing DeLamar project, which includes the adjacent DeLamar and Florida Mountain gold and silver deposits, is located in Owyhee county in southwest Idaho. Since acquiring the project in 2017, the company has demonstrated significant resource growth and conversion while providing robust economic studies in its maiden preliminary economic assessment and PFS. An independent technical report for the PFS on the DeLamar project has been prepared in accordance with the requirements of National Instrument 43-101 and is available under the company's profile on SEDAR.

About Integra Resources Corp.

Integra is one of the largest precious metals exploration and development companies in the Great basin of the Western United States. Integra is currently focused on advancing its three flagship oxide heap leach projects: the past-producing DeLamar project located in southwestern Idaho and the Wildcat and Mountain View projects located in western Nevada. The company also holds a portfolio of highly prospective early-stage exploration projects in Idaho, Nevada and Arizona. Integra's long-term vision is to become a leading United States-focused mid-tier gold and silver producer.

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