Integra Resources Corp. announced the remaining drill results from the stockpile drill program at the DeLamar Project (?DeLamar? or the ?Project?) located in southwestern Idaho.

The stockpile drill program was completed in Second Quarter 2023 and totaled 12,588 meters (?m?) in 321 drill holes. This news release includes results from the remaining 145 drill holes representing 4,244 m. The stockpile drill program at DeLamar was designed to test a large portion of the estimated 60 million tonnes (?Mt?) of gold and silver mineralized material that was stockpiled and/or used as backfill at the Project by previous operators. The Company believes that oxide-and-mixed gold and silver mineralized material from the stockpiles and backfill at DeLamar has the potential to increase the heap leach mine life of the Project in future phases and further bolster the robust economics presented in the 2022 Pre-feasibility Study (?PFS?).

Integra intends to release an updated mineral resource estimate for DeLamar in Third Quarter 2023 which will include the stockpile and backfill mineralized material. In Fourth Quarter 2023, the Company expects to submit the Mine Plan of Operations (?MPO?) at DeLamar to the United States Bureau of Land Management. The MPO is the first significant step in the National Environmental Policy Act permitting process as it represents the proposed action for the Project.

Latest Drilling Highlights: The latest drilling highlights from DeLamar (North DeLamar, Stockpile 1) include: NDM-23-133: 0.23 grams per tonne (?g/t?) gold (?Au?) and 20.17 g/t silver (?Ag?) (0.49 g/t gold equivalent (?AuEq?)) over 103.63 m NDM-23-127: 0.29 g/t Au and 24.54 g/t Ag (0.61 g/t AuEq) over 30.48 m NDM-23-131: 0.24 g/t Au and 17.08 g/t Ag (0.46 g/t AuEq) over 97.54 m WD1-23-324: 0.23 g/t Au and 21.23 g/t Ag (0.50 g/t AuEq) over 27.43 m The latest drilling highlights from Florida Mountain (Jacobs Gulch) include: JG-23-024: 0.33 g/t Au and 10.22 g/t Ag (0.46 g/t AuEq) over 21.34 m JG-23-138: 0.32 g/t Au and 7.38 g/t Ag (0.41 g/t AuEq) over 41.15 m JG-23-181: 0.34 g/t Au and 11.15 g/t Ag (0.49 g/t AuEq) over 19.81 m Drill Program Highlights: The stockpile and backfill program tested 4 targets at DeLamar and 2 targets at Florida Mountain, representing approximately 49 Mt and 11 Mt of mineralized material respectively. At DeLamar, the targets included the North DeLamar and Sommercamp Backfill as well as Stockpiles 1 and 2. At Florida Mountain, the targets included the Jacobs Gulch Stockpile and Tip Top Backfill. Highlight intercepts from each target of the drill program released since December 2022 include: DeLamar North DeLamar Backfill: NDM-22-039: 0.27 g/t Au and 24.60 g/t Ag (0.59 g/t AuEq) over 111.25 m Stockpile 1 & 2: WD1-23-168: 0.65 g/t Au and 20.91 g/t Ag (0.92 g/t AuEq) over 39.62 m, including 12.51 g/t Au and 31.04 g/t Ag (12.91 g/t AuEq) over 1.52 m Sommercamp Backfill: SC-23-063: 0.50 g/t Au and 18.35 g/t Ag (0.74 g/t AuEq) over 38.10 m Florida Mountain Jacobs Gulch Stockpile: JG-23-109: 0.62 g/t Au and 9.54 g/t Ag (0.74 g/t AuEq) over 76.20 m, including 7.30 g/t Au and 9.13 g/t Ag (7.42 g/t AuEq) over 1.53 m Tip Top Backfill: TT-23-012: 0.40 g/t Au and 12.26 g/t Ag (0.56 g/t AuEq) over 57.91 m, including 6.92 g/t Au and 64.24 g/t Ag (7.75 g/t AuEq) over 1.53 m Key Observations and Next Steps: The stockpile/backfill mineralized material, a portion of which was included as a pre-stripping cost in the PFS, has the potential, subject to future studies, to significantly enhance the economics of the overall Project.

The Jacobs Gulch Stockpile (~9 Mt) is located at Florida Mountain and contains slightly higher-grade mineralized material than other stockpiles and backfill. Subject to ongoing engineering, this stockpile could be placed on the heap leach pad in early years of processing before the current location becomes a development rock storage facility (?DRSF?). This stockpile may be included in the MPO submittal.

The North DeLamar Backfill (~16 Mt) contains the most mineralized material on a tonnage basis and has the potential to contribute the greatest number of ounces of gold and silver in the upcoming mineral resource estimate. A portion of this mineralized material was included as a pre-stripping cost in the PFS and will be included in the MPO submittal. The Tip Top Backfill (~2 Mt), located at Florida Mountain, is located on top of the in-situ resource.

Subject to ongoing engineering studies, this backfill material may be included in the MPO submittal. Sommercamp Backfill (~5 Mt) is located at DeLamar and a portion of this mineralized material was included as a pre-stripping cost in the PFS mine plan. In future mine plans, this material has the potential to be mined at a lower cost since a portion of it was moved as waste in the PFS.

A portion of this backfill will be included in the MPO submittal. Stockpiles 1 (~16 Mt) and 2 (~12 Mt) are located at DeLamar. These stockpiles are not situated on top of in-situ resource which allows flexibility of processing in future mine plans.

In general, the stockpile/backfill material drilled is consistent in both grade and mineralized width, demonstrating impressive continuity. Access to mineralized material in the stockpiles and backfill are expected to provide additional flexibility to load the heap leach pad during any potential operational or weather related events once in operation. Metallurgical testwork on the mineralized material is underway with cyanide shakes complete and bottle roll tests from all areas underway.

Preliminary bottle roll testing from the DeLamar stockpiles and backfill is encouraging. At least one column leach test from each of the six areas are planned to begin before the end of the year. The mineralized stockpiles and backfill that were not included as part of pre-stripping costs in the PFS is expected to have lower overall mining costs in future economic studies since the material is located at surface and was previously mined, eliminating or limiting additional blasting costs.

An updated mineral resource estimate is expected this quarter which should demonstrate strong resource growth at the Project from the stockpiles and backfill, further growing the industry leading resource endowment in the Great Basin controlled by Integra. The Company plans to begin an updated economic study for DeLamar next year, which will include mineralized material from the stockpiles and backfill, highlighting the potential for this material to increase the heap leach mine life and overall gold and silver production in future phases.