Updated Mineral Resource Estimate At The DeLamar And Florida Mountain Deposits

VANCOUVER - Integra Resources Corp. announced an updated Mineral Resource Estimate (MRE) for the DeLamar and Florida Mountain Deposits located in southwestern Idaho that incorporates the results from the highly successful stockpile drill program completed in April 2023. The stockpile drill program added a Measured and Indicated (M&I) resource of 504,000 ounces (oz) gold equivalent (AuEq) and an Inferred resource of 46,000 oz AuEq. The mineralized stockpile and backfill material that was incorporated into the updated DeLamar MRE demonstrates the potential for this material to significantly increase the heap leach mine life in future phases. The updated DeLamar MRE increased the total heap leachable oxide-and-mixed ounces within the M&I category by ~25% and increased the total Inferred ounces by ~31%. In total, ~90% of the updated MRE falls within the M&I category, highlighting the quality and scarcity of projects such as DeLamar in the prolific Great Basin mining district.

Including the 2023 DeLamar MRE, Integra now controls a total M&I resource of 6.2 million ounces (Moz) AuEq and a total Inferred resource of 0.9Moz AuEq across its key projects located in Idaho and Nevada, representing one of the largest resource endowments in the Great Basin not controlled by a major mining company. The maiden stockpile resource estimate contains a M&I resource of 504 thousand ounces (“koz”) AuEq at 0.37 grams per tonne (“g/t”) AuEq, including 296koz gold (“Au”) and 16.1Moz silver (“Ag”) and an Inferred resource of 46koz AuEq at 0.30 g/t AuEq, including 26koz Au and 1.5Moz Ag. The Company allocated a total of ~US$4.6 million toward the stockpile drill program which successfully resulted in the addition of >500kozs AuEq (M&I), representing the lowest discovery cost per ounce in the history of DeLamar. A portion of the mineralized stockpile and backfill material was moved as a pre-stripping cost in the 2022 Pre-feasibility Study (“PFS”), however this material is expected to be processed in future economic studies. The stockpile and backfill material is also expected to reduce the overall mining cost as the material is located at surface and was previously mined, reducing or eliminating additional blasting costs.

The total DeLamar M&I resource contains 4.8Moz AuEq at 0.60 g/t AuEq, including 2.9Moz Au and 142.7Moz Ag. The total DeLamar Inferred resource contains 621koz AuEq at 0.45 g/t AuEq, including 428koz Au and 15.0Moz Ag.

The oxide and mixed heap leach portion of the M&I resource contains 2.6Moz AuEq at 0.50 g/t AuEq, including 1.6Moz Au and 73.9Moz Ag. The oxide and mixed heap leach portion of the Inferred resource contains 284koz AuEq at 0.36 g/t AuEq, including 199koz Au and 6.6Moz ounces Ag. The significantly increased oxide and mixed resource at DeLamar demonstrates the potential for an extended heap leach mine life in future phases of operations.

The Company anticipates filing the Mine Plan of Operations (MPO) for DeLamar in Q4 2023, making DeLamar one of the only precious metal development projects in the Western United States that is actively being advanced towards a production permit.

Notes:

President, CEO & Director, Jason Kosec said, “We are extremely proud of our entire team for the combined effort that delivered the DeLamar MRE on time and above expectations. The updated MRE at DeLamar represents a significant milestone for the Company and further solidifies Integra’s position as an industry leading exploration and development company focused in the Great Basin. The highly successful stockpile drill program and subsequent MRE have increased the oxide-and-mixed M&I resource at DeLamar by ~25%, validating the Company’s belief that the mineralized stockpile and backfill material at surface has the potential to significantly expand the heap leach mine life in future phases of operations. This mineralized material, a portion of which was included as a pre-stripping cost in the Company’s 2022 PFS, is expected to provide important operational flexibility for the potential heap leach operation. The Company has begun optimization work on the mineralized stockpile material to evaluate its potential inclusion in future phases of heap leaching at DeLamar which will be formally included in a Feasibility Study expected to be released in late 2024 or early 2025. The focus of the team now shifts to finalizing the MPO for DeLamar which will be submitted in Q4 2023, representing another important step toward the Company’s vision of becoming a leading USA focused gold and silver producer.”