Mr. Jason Kosec reports

INTEGRA ANNOUNCES ADDITIONAL OXIDE DRILL RESULTS FROM STOCKPILE DRILLING PROGRAM AT DELAMAR, INCLUDING 0.67 G/T AUEQ OVER 81 M AND 0.58 G/T AUEQ OVER 49 M

Integra Resources Corp. has provided drill results from 21 additional drill holes, representing 860 metres, from the recently completed stockpile drilling program at the DeLamar project located in southwestern Idaho. The company is also pleased to provide an update on the previously announced share consolidation which, following the receipt of final regulatory approvals, is now expected to become effective on May 26, 2023.

The stockpile drilling program at DeLamar was designed to test a large portion of the estimated 60 million tonnes (Mt) 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.

Integra is currently focused on achieving several key milestones in 2023, including an updated mineral resource estimate and the submission of the mine plan of operations at DeLamar, as well as an updated mineral resource estimate and preliminary economic study at the Wildcat and Mountain view projects, located in western Nevada.

Drilling highlights

• The stockpile drilling program at DeLamar was completed in April, 2023, and consisted of 321 holes, totalling 12,588 metres.
• The latest drill results from DeLamar (North DeLamar, Sommercamp, Stockpile 1 and 2) include:
  • NDM-23-118: 0.38 gram per tonne (g/t) gold (Au) and 22.52 g/t silver (Ag) (0.67 g/t gold equivalent (AuEq)) over 80.77 m;
  • WD1-23-299: 0.31 g/t Au and 20.63 g/t Ag (0.58 g/t AuEq) over 48.77 m;
  • NDM-23-199: 0.29 g/t Au and 14.34 g/t Ag (0.48 g/t AuEq) over 85.34 m;
  • NDM-23-021: 0.21 g/t Au and 22.61 g/t Ag (0.50 g/t AuEq) over 54.87 m;
  • NDM-23-053: 0.26 g/t Au and 20.91 g/t Ag (0.53 g/t AuEq) over 50.29 m.
• The latest drill results from Florida Mountain (Jacobs Gulch and Tip Top) include:
  • JG-23-027: 0.38 g/t Au and 11.85 g/t Ag (0.53 g/t AuEq) over 27.43 m;
  • JG-23-075: 0.34 g/t Au and 15.25 g/t Ag (0.54 g/t AuEq) over 21.34 m;
  • JG-23-100: 0.33 g/t Au and 6.04 g/t Ag (0.40 g/t AuEq) over 70.10 m.
• Observations are consistent with previously reported results from the stockpile drilling program, with results demonstrating excellent gold equivalent grade and drill intercept widths with strong continuity throughout the material.
• Final drill samples have been shipped to the assay lab and estimation work has commenced for the updated mineral resource estimate at DeLamar, including results from the stockpile drilling program.
• Results from 8,229 m, representing 226 drill holes, have yet to be released. The company will continue to release results as they are received from the lab.

Integra's president, chief executive officer and director, Jason Kosec, commented: "The successful completion of the stockpile drilling program this winter required a monumental effort and we are extremely thankful for our industry-leading team at site. Over all, the drill program was a resounding success with the results exceeding our original estimates and modelling in terms of grade and continuity. The updated resource estimate, including results from the stockpile drill program, is expected to demonstrate the potential for the material to significantly increase the heap leach mine life in future phases as well as enhance the overall project economics at DeLamar."

Detailed drill results

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

                                                                                                  AuCN
                    From           To         Int.           Au           Ag         AuEq     recovery
Drill hole            (m)          (m)          (m)        (g/t)        (g/t)        (g/t)          (%)
                                                                                                      
NDM-23-021          1.52        56.39        54.87         0.21        22.61         0.50        73.72
NDM-23-053          0.00        50.29        50.29         0.26        20.91         0.53        71.13
NDM-23-118          0.00        80.77        80.77         0.38        22.52         0.67        58.22
NDM-23-199          0.00        85.34        85.34         0.29        14.34         0.48        71.60
SC-23-024           0.00        13.72        13.72         0.27        20.84         0.54        58.61
SC-23-032           1.52        28.96        27.44         0.25        18.05         0.48        67.68
SC-23-034           0.00        15.24        15.24         0.24        26.34         0.57        74.72
SC-23-119           1.52         9.14         7.62         0.30        39.79         0.81        84.07
WD1-23-066          0.00        41.15        41.15         0.13        21.32         0.40        46.77
WD1-23-220          0.00        50.29        50.29         0.18        13.18         0.35        74.39
WD1-23-229          0.00        48.77        48.77         0.31        20.63         0.58        72.47
WD1-23-247          0.00        16.76        16.76         0.21        34.98         0.66        89.30
WD2-23-107          0.00        21.34        21.34         0.39        14.60         0.58        80.51
WD2-23-133          0.00        44.20        44.20         0.17        14.36         0.35        75.83
WD2-23-208          1.52        41.15        39.63         0.26         9.76         0.39        70.13
WD2-23-226          1.52        30.48        28.96         0.18        18.27         0.41        78.05

(1) Downhole thickness is true thickness.
(2) Intervals reported are uncapped.
(3) AuEq is g/t Au plus (g/t Ag divided by 77.70). Rounding may cause minor discrepancies in the AuEq 
    column.
(4) Au recovery based on cyanide shakes (AuCN) run on all intervals with Au assay values over 0.1 g/t.

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

                  From         To       Int.         Au         Ag       AuEq
Drill hole          (m)        (m)        (m)      (g/t)      (g/t)      (g/t)
                                                                             
JG-23-027         0.00      27.43      27.43       0.38      11.85       0.53
JG-23-075         0.00      21.34      21.34       0.34      15.25       0.54
JG-23-100         0.00      70.10      70.10       0.33       6.04       0.40
JG-23-106         0.00      48.77      48.77       0.33       6.38       0.41
TT-23-036         0.00      21.34      21.34       0.34      10.37       0.47

(1) Downhole thickness is true thickness.
(2) Intervals reported are uncapped.
(3) AuEq is g/t Au plus (g/t Ag divided by 77.70). Rounding may cause minor 
    discrepancies in the AuEq column.

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.

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.

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 grams per tonne on a five-acid digestion, with a fire assay, gravimetric finish for results over 100 g/t silver.

Share consolidation update

In connection with the previously announced at-market merger of Integra and Millennial Precious Metals Corp. by way of a court-approved plan of arrangement that was completed on May 4, 2023, the company will consolidate all of its common shares on the basis of one new postconsolidation common share for every 2.5 existing preconsolidation common shares.

The board of directors of the company has approved the consolidation, which will be effective as of May 26, 2023. The consolidation reduces the number of outstanding common shares from 171,943,828 to approximately 68,777,531. Proportionate adjustments will be made to the company's outstanding stock options, restricted share units and deferred share units. No fractional common shares will be issued pursuant to the consolidation and any fractional common shares that would have otherwise been issued will be rounded to the nearest whole common share.

A letter of transmittal with respect to the consolidation will be mailed to the company's registered shareholders. All registered shareholders will be required to send their certificate(s) or direct registration system advices (DRS advices) representing preconsolidation common shares, along with a properly executed letter of transmittal, to the company's registrar and transfer agent, TSX Trust Company, in accordance with the instructions provided in the letter of transmittal. Shareholders who hold their common shares through a broker, investment dealer, bank or trust company should contact that nominee or intermediary for their postconsolidation positions. A copy of the letter of transmittal is posted on the company's issuer profile on SEDAR. It is anticipated that the postconsolidation common shares will commence trading on the TSX Venture Exchange and the NYSE American under its new Cusip No. 45826T509 (ISIN CA45826T5098) on May 26, 2023. The company's TSX Venture Exchange ticker symbol ITR and NYSE American ticker symbol ITRG will remain the same.

Millennial warrants

Pursuant to the arrangement, each Millennial warrant to purchase common shares will, upon the exercise of such rights, entitle the holder thereof to be issued and receive for the same aggregate consideration, upon such exercise, in lieu of the number of Millennial common shares to which such holder was theretofore entitled upon exercise of such Millennial warrants, the kind and aggregate number of common shares that such holder would have been entitled to be issued and receive if, immediately prior to the effective time of the arrangement, such holder had been the registered holder of the number of Millennial shares to which such holder was theretofore entitled upon exercise of such Millennial warrants. All other terms governing the warrants, including, but not limited to, the expiry date, exercise price, and the conditions to and the manner of exercise, will be the same as the terms that were in effect immediately prior to the effective time of the arrangement, and shall be governed by the terms of the applicable warrant instruments. Pursuant to the consolidation, proportionate adjustments will be made to the aggregate number of common shares that such holder is entitled to upon exercise of such Millennial warrants and to the exercise price of the Millennial warrants.

Prior to the completion of the arrangement, Millennial had outstanding a class of Millennial warrants listed on the TSX Venture Exchange under the trading symbol MPM.WT. The listed Millennial warrants will continue trading on the TSX-V as Millennial warrants, under its existing trading symbol, and will remain listed on the TSX-V until the earliest to occur of their exercise, expiry or delisting. Pursuant to the consolidation, the exercise price of the listed Millennial warrants will be adjusted from 55 cents to $1.375 and every one listed Millennial warrant will be exercisable to acquire 0.092 of a common share.

As required by the warrant indenture in respect of the listed Millennial warrants, Integra has entered into a supplemental warrant indenture in respect of such warrant indenture governing the listed Millennial warrants. A copy of the supplemental warrant indenture is available on Millennial's and Integra's respective SEDAR profiles.

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.

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 USA-focused mid-tier gold and silver producer.

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