Integra Resources Corp. announced an exploration program to expand the Oxide and Mixed resource at its DeLamar Project while advancing the heap leach stage of the project into permitting and development on a stand-alone basis. The simple, low-cost, low-risk strategy to focus on the financial engine of the Project, the heap leach, does not negate the strong optionality of the project in multiple areas.

Exploration efforts going forward will target heap leachable material to expand the heap leach life-of-mine. Advancing the DeLamar gold-silver project towards permitting and development of the heap leach stage as a stand-alone mining operation, is a far lower cost, lower risk option for the Company and its shareholders, creating strong economic returns and rapid payback. In these inflationary times, with increased scrutiny on permitting of all resource projects, this is the optimal strategy for the Company and its shareholders, as it vastly reduces execution risk.

The Company will continue to assess timing for development of the mill and related operations based on market factors and other variables in the future, once the heap-leach mine is fully operational. Additional enhancements to the future Non-oxide processing as well as potential high-grade gold-silver from Florida Mountain will continue to be studied and explored; however, incorporating these options after permitting for the heap leach stage presents a much lower-risk investment scenario for the Company and its shareholders. The ability to advance a simple, low-capital intensity and highly economic heap leach stand- alone gold-silver mine operation while preserving future optionality will be the focus of permitting, development and exploration on the Project in the near term.

Permitting work at DeLamar has been initiated and is focused on a fully developed stand-alone heap leach gold-silver operation. Baseline study work is well underway to support the submittal of a Plan of Operations in H1 2023. Integra expects many ancillary benefits by focusing on the heap leach stand-alone mine permitting, including: Mill expansion capital requirements will no longer be a project requirement, leading to a savings of over USD 235 million on life of mine capital.

In this scenario, estimated site level AISC costs also drop from USD 955/oz to USD 814/oz, on a co-product basis, thus significantly reducing future financing risk. Funds generated from the successful future operation of the heap leach will not be initially committed to Non-oxide mill processing construction, but instead used to reduce the payback period of the mine and deployed for other purposes such as expanded resource development The heap leach stand-alone mine will no longer require the permitting and construction of a mill or a 97-hectare tailings storage facility, significantly reducing land disturbance and permitting risk The amount of waste rock produced from the heap leach stand-alone scenario will be far less. Significant reduction in tailings, waste dumps and potential pit lakes.

Development of the heap leach only mine at DeLamar will lead to significant decreases in water and power usage, further simplifying permitting and development. West of Florida Mountain in the areas of Rich Gulch and Blue Gulch, soil geochemistry and Induced Polarization ("IP") Chargeability has delineated a large, mineralized area of which the upper has potential to provide additional Oxide and Mixed resource for the proposed heap-leach operation. This consists of several 50 m wide zones with a combined strike length of 2,000 m with historical drilling in the area showing very encouraging grades.

Based on the historical drilling, the depth of partial to complete oxidation is expected to range between 50 m and 70 m. Exploration in the BlackSheep District, to the north of DeLamar, is in its early stages. However, two extensive areas of outcropping mineralization have been identified based on soil geochemistry, IP Chargeability, and historical drilling. At Slaughterhouse Gulch, a 2,000 m long by 70 m to 100 m wide mineralized corridor has been delineated and is ready to be drill tested.

Similarly, at Lucky Days, a 1,000 m long by several hundred-meter-wide zone of mineralization will be drill tested this year to better define the mineralized structures prior to delineating a resource. There is also an opportunity, through the evaluation of the historical low-grade stockpiles and backfill, for gold and silver to be processed using similar heap leach methods outlined in the PFS. Kinross Gold Corp.

("Kinross"), the previous operator of the Project, halted production and began reclamation efforts in 2001 at very low gold and silver prices as compared to current prices. The average grade of the approximately 22 Million tonnes ("Mt") of mill feed processed during the life of the Nerco Kinross operation was 1.2 g/t Au and 75 g/t Ag, with approximately 70Mt of lower-grade material being stockpiled in low-grade stockpiles and pit back-fill. During the 20-year long mining operation, Kinross mine staff clearly viewed that this material might someday become economic at higher gold-silver prices and improved low-grade gold-silver processing techniques.

The Company estimates that approximately 60Mt of this run-of-mine low-grade waste could be available for processing via heap-leaching, subject to further confirmatory studies. Based on preliminary in-house calculations and limited historic drilling of the low-grade stockpiles, the Company is optimistic that the average grade of the low-grade dumps and back-fill is likely to be above the 0.2 g/t AuEq used as the Heap Leach cut-off grade in Integra's recent PFS. The Company continues to pursue the high-grade potential below Florida Mountain.

To date, the Company has drilled more than 110 intercepts of high-grade gold and silver at Florida Mountain. The high- grade structures at Florida Mountain extend 7,000 m on strike in the North-South direction and to a depth of 400 m. The Company intends to complete surface drilling along this strike length to further identify the location of high-grade shoots that dip steeply below Florida Mountain. The Company is in the process of compiling all the high-grade drill intersects to date to further study continuity at Florida Mountain and the potential for an Inferred Resource Estimate.

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, Nevada for preparation and analysis. Analysis of gold is performed using fire assay method with atomic absorption (AA) finish on a 1 assay ton aliquot.

Gold results over 5 g/t are re-run using a gravimetric finish. Silver analysis is performed using ICP for results up to 100 g/t on a 5 acid digestion, with a fire assay, gravimetric finish for results over 100 g/t silver.