Integra Resources Corp. press release

FLORIDA CANYON FEASIBILITY STUDY DELIVERS SUBSTANTIAL INCREASE IN MINERAL RESERVE, GOLD PRODUCTION OVER AN 8-YEAR MINE LIFE AND US$0.8 BILLION IN AFTER-TAX FREE CASH FLOW; PROVIDES OPERATIONAL UPDATE

2026-06-25

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TSXV:ITR; NYSE American: ITRG www.integraresources.com

VANCOUVER, BC, June 25, 2026/CNW/ - Integra Resources Corp. ("Integra" or the "Company") (TSXV: ITR) (NYSE American: ITRG) is pleased to announce the results of its updated Technical Report Feasibility Study and Life-of-Mine Plan (the "Technical Report") for the producing Florida Canyon Mine ("Florida Canyon" or the "Project"), located in Nevada. Less than two years after acquiring Florida Canyon for $68 million ("M")1, Integra has transformed the operation into a larger, longer-life asset with a 74% increase in Proven and Probable Mineral Reserves, a 17% increase in annual gold production and active mining extended through 2033. Florida Canyon is now expected to generate over $0.8 billion ("B") from gold production in after-tax free cash flow2and total payable gold production of 685 thousand ounces ("Koz") over life-of-mine ("LOM"), including 2 years of gold production from residual leaching starting in 2033.

(All amounts in United States ("U.S.") dollars and Metric Units unless otherwise stated)

2026 Florida Canyon Technical Report Highlights:

Robust gold project economics: After-tax net present value 5% ("NPV") of $601 M using base case metal prices3; After-tax NPV of ~$723 M using spot metal prices4. Significant increase in Proven and Probable Mineral Reserve: Integra replaced gold ("Au") mined at Florida Canyon over the last two years and increased the Proven and Probable Mineral Reserve ("P&P") at Florida Canyon by 74%. The P&P increased from 685 Koz Au in the 2024 Mineral Reserve Statement5to 1.19 million ounces ("Moz") Au in the 2026 Mineral Reserve Estimate, a 506 Koz Au increase in P&P6. Substantial increase in oxide Mineral Resources:The Mineral Resource Estimate ("MRE") increased 128% in the oxide Measured and Indicated ("M&I") category and 57% in the oxide Inferred ("Inf.") category, including a MRE on the Standard Mine located south of Florida Canyon. Enhanced gold production profile and extended mine life: The annual production profile in the Technical Report has increased from 70 Koz Au to an average of 82 Koz Au over an 8-year operating mine life (inclusive of 2026), a 12 Koz Au increase in average annual production with operating mine life extending from 2030 to 2033 (not including 2 years of gold production from residual leaching starting in 2033). Strong free cash flow2supports growth: Florida Canyon is expected to generate approximately $0.8 B in LOM after-tax free cash flow and average annual after-tax free cash flow of $90 M, supporting growth capital investments at Florida Canyon to increase mine life and annual production profile. Lower LOM All-in Sustaining Costs2 and Revised 2026 Cost Guidance:Site-level all-in sustaining costs ("AISC") are expected to average approximately $2,331/oz over LOM. Due to the increase in tonnes mined, stacked and processed this year, along with inflationary pressures on diesel fuel and explosives, among others, the Company is revising its 2026 site-level AISC guidance from $2,750 to $2,950 to $3,300 to $3,500 while re-confirming and maintaining production guidance in 2026 of 70 Koz to 75 Koz Au. The updated mine plan in the Technical Report establishes a clear path toward lower long-term costs and higher annual gold production in future years. Optimized mine plan that unlocks value: Informed by two years of operating experience and a comprehensive review of historical performance and costs, the Technical Report delivers a more stable, predictable and executable mine plan for Florida Canyon. All production growth and planned heap leach pad expansion contemplated in the Technical Report can be supported within the existing Mine Plan of Operations. Cash flow to support project pipeline:Cash flow from Florida Canyon will support the advancement of the DeLamar Project through permitting, with the Final Environmental Impact Statement and Record of Decision expected in H2 2027, and the Company's Nevada North project. Creating a path for the Company to become a multi-asset, mid-tier precious metals producer in the United States. Multiple opportunities identified to increase LOM production and gold resource:The Company is evaluating several opportunities to further increase gold recoveries, production and operating efficiency at Florida Canyon, including additional crushing capacity, haul road optimization, and improved truck routing. In addition, a 42,500 m exploration program is underway to identify potential mineral resource growth adjacent to the existing operation and across the Project. These opportunities are conceptual and not included in the current Mineral Reserve Estimate or economic analysis.

| 1. See news release dated July 29, 2024. 2. This is a non-GAAP financial measure, please refer to the "Cautionary Note Regarding Non-GAAP Measures" disclosure at the end of this news release for a description of this measure. 3. NPV discounted to January 1, 2026, and includes cash flows from January 1, 2026 to May 31, 2026. Base case gold prices: 2026 ($4,344/oz), 2027 ($4,414/oz), 2028 ($4,169/oz), 2029 ($3,824), 2030 to 2035 ($3,600/oz). 4. Assuming a gold price of $4,200/oz from mid-2026 to 2035. 5. Based on the technical report entitled, "NI 43-101 Technical Report, Florida Canyon Gold Mine, Pershing County, Nevada, USA" dated July 1, 2024, with an effective date of June 28, 2024 (the "2024 Technical Report") with additional production depletion through December 31, 2025. In the 2024 Technical Report, the P&P was 861 Koz. 6. Please see notes for Mineral Resource Estimate and notes for Mineral Reserve Estimate below. |

George Salamis, President, CEO and Director of Integra commented: "Since acquiring Florida Canyon in late 2024, the team has developed a deep understanding of the operation and systematically addressed the opportunities identified during the acquisition. Through disciplined investment, exploration drilling, operational improvements and detailed mine planning, Florida Canyon has been transformed into a fundamentally stronger asset with higher gold production, lower future costs, a longer mine life and a substantially larger mineral reserve base. Florida Canyon is now expected to generate approximately $0.8 billion in after-tax free cash flow over an 8-year mine life, establishing Florida Canyon as the cash flow engine of Integra and providing the financial foundation to advance our development pipeline in Idaho and Nevada."

Mr. Salamis added: "Based on the updated mine plan, we are intentionally investing to drive future growth. The higher costs expected in 2026 are short-term in nature and are tied to increased mining rates at the mine this year. As Florida Canyon transitions to a more stable operation, we expect to benefit from lower costs and enhanced economics."

"The updated Mineral Resource Estimate demonstrates the significant value created at Florida Canyon since its acquisition. Despite two years of mining depletion, the Company has increased Proven and Probable Mineral Reserves by 74%, extended mine life by 3-years and increased annual gold production by 17%. Importantly, this growth has been achieved within a producing, self-funding mine and reinforces the Company's belief that Florida Canyon remains significantly underexplored with substantial upside. Combined with the advancement of DeLamar and Nevada North, Florida Canyon provides a strong foundation for Integra's long-term growth as a U.S.-focused precious metals producer."

Integra will host a conference call and webcast to discuss the Technical Report on June 26, 2026, at 8am Pacific Time / 11am Eastern Time, featuring a presentation from the senior management team and a live Q&A session. A recording will be available on Integra's corporate website at www.integraresources.com. To register for the webcast, please use the following link (call details are listed below):

https://events.q4inc.com/attendee/752689074

Technical Report Summary

The Technical Report reflects the evolution of Florida Canyon from a project with limited mine life and flat annual gold production into a project with an increased production profile and an extended mine life. The enhanced mine plan utilizes existing infrastructure and the current crushing circuit to support an 8-year operating mine life with a LOM site-level AISC of $2,331/oz. Annual gold production increases 17% from 70 Koz to 82 Koz, resulting in LOM gold sold of 685 Koz.

The mine plan outlined in the Technical Report represents a material transformation of Florida Canyon. To realize this growth, Integra plans to use its existing cash flow to invest approximately $92 M towards growth capital investments, including $55 M towards the expansion of heap leach capacity within the existing Mine Plan of Operations footprint and $37 M towards the modernization and replacement of the legacy fleet. These investments allow the Company to execute on the updated mine plan outlined in the Technical Report. The Technical Report highlights a base case after-tax NPV of $601 M (see Table 1 for base case gold price assumptions and Table 2 for after-tax NPV and LOM cumulative cash flows at various gold prices).

The Company retained Global Resource Engineering ("GRE") as lead consultants, along with other engineering consultants, to complete the Technical Report and prepare the Technical Report in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101"). The Technical Report is derived from the updated mineral reserve estimate effective May 31, 2026. The effective date of the Technical Report is June 25, 2026, and the Technical Report prepared in accordance with NI 43-101 will be filed on the Corporation's website and under its SEDAR+ profile within 45 days of this news release.

Table 1: Florida Canyon Technical Report Highlights1

| Mining | | | Total Tonnage Mined (K tonnes ("Kt")) | 211,199 | | Total Ore Mined (Kt) | 116,935 | | Strip Ratio (Waste: Ore) | 0.81 | | Mine Life (Mining Yrs) | 8.0 | | Contained Gold (Koz Au) | 1,156 | | Production | | | LOM Average Gold Recovery (%) | 56.7 % | | LOM Gold Recoverable Placed (Koz Au) | 656 | | LOM Gold Sold (Koz Au) | 685 | | Average Annual Gold Sold (Koz Au) - Mining Yrs | 81.8 | | Costs per Tonne (Mining Years 2026 to 2033) | | | Mining Costs ($/t mined) | $3.04 | | Mining Costs ($/t placed) | $5.50 | | Crushing & Processing Costs ($/t placed) | $3.03 | | G&A Costs ($/t placed) | $1.24 | | Total Site Operating Cost ($/t placed) | $9.77 | | LOM Site-Level Cash Costs ($/oz Au) | | | LOM Cash Cost, net-of-silver by-product | $1,940 | | LOM Site-Level AISC, net-of-silver by-product 2 | $2,331 | | LOM Capital Expenditure ($ M) | | | Sustaining Capital | $130.2 | | Capitalized Stripping | $86.5 | | Development Drilling | $7.9 | | Financing Leases - Sustaining | $42.8 | | Growth Capital | $91.8 | | Financing Leases - Growth Capital | $8.6 | | Salvage Value | ($16.9) | | Reclamation Cost | $40.2 | | Bonding Cash Collateral Return | ($11.4) | | Gold Price Assumptions ($/oz) | | | Gold Price 2026 | $4,344 | | Gold Price 2027 | $4,414 | | Gold Price 2028 | $4,169 | | Gold Price 2029 | $3,824 | | Gold Price 2030 to 2035 | $3,600 | | Project Economics ($ M) | | | After-Tax NPV5% | $600.6 | | Average Annual Net Free Cash Flow (Mining Yrs) | $90.0 | | Total Net Free Cash Flow | $769.5 |

| | | | (1) | Please refer to "Cautionary Note Regarding Non-GAAP Measures" for a description of non-GAAP financial measures included in this table. | | (2) | Excluding closure costs. |

Figure 1: Florida Canyon Annual Production and Operating Cost Profile1

| (1) | Please refer to "Cautionary Note Regarding Non-GAAP Measures" for a description of non-GAAP financial measures included in this figure. |

Figure 2: Florida Canyon LOM After-tax Free Cash Flow1

| (1) | Please refer to "Cautionary Note Regarding Non-GAAP Measures" for a description of non-GAAP financial measures included in this figure. |

Table 2: Florida Canyon After-Tax NPV and LOM After-tax Net Cash Flow ("CF") Sensitivity to Gold Price1

| | | | | Gold Price Estimate ($/oz) | | | | | | Change in Gold Price | After-Tax NPV (5%) $M | After-Tax LOM CF $M | | 2026 | 2027 | 2028 | 2029 | 2030 to 2035 | | (25 %) | $203.8 | $275.3 | | $3,535 | $3,311 | $3,127 | $2,868 | $2,700 | | (20 %) | $283.5 | $374.8 | | $3,697 | $3,531 | $3,335 | $3,059 | $2,880 | | (15 %) | $363.2 | $474.1 | | $3,859 | $3,752 | $3,544 | $3,250 | $3,060 | | (10 %) | $443.1 | $573.5 | | $4,021 | $3,973 | $3,752 | $3,442 | $3,240 | | (5 %) | $522.3 | $672.1 | | $4,183 | $4,193 | $3,961 | $3,633 | $3,420 | | Base | $600.6 | $769.5 | | $4,344 | $4,414 | $4,169 | $3,824 | $3,600 | | 5 % | $676.5 | $864.2 | | $4,506 | $4,635 | $4,377 | $4,015 | $3,780 | | 10 % | $752.3 | $958.7 | | $4,668 | $4,855 | $4,586 | $4,206 | $3,960 | | 15 % | $828.0 | $1,053.2 | | $4,830 | $5,076 | $4,794 | $4,398 | $4,140 | | 20 % | $903.6 | $1,147.3 | | $4,992 | $5,297 | $5,003 | $4,589 | $4,320 | | 25 % | $978.0 | $1,239.4 | | $5,154 | $5,518 | $5,211 | $4,780 | $4,500 |

| (1) | Please refer to "Cautionary Note Regarding Non-GAAP Measures" for a description of non-GAAP financial measures included in this table. |

Property Description, Location and Access

Florida Canyon is located 125 miles (~201 kilometers) east of Reno, Nevada, and immediately south of Interstate 80. The nearest towns are Winnemucca, 40 miles northeast (~64 kilometers) with a population of 8,388 (2022) and Lovelock, 33 miles southwest, with a population of 1,854 (2022). The highway exit for the Florida Canyon Mine from I-80 is at Imlay, Nevada. Access is reliable via the Interstate year-round.

Commercial mining operations at Florida Canyon began in 1986 using conventional open-pit mining and heap-leach processing methods. The mine operated continuously through 2011 before entering a period of intermittent production until 2015. Florida Canyon was subsequently restarted in mid-2016 following new investment and operational improvements and has remained in operation since. Since the restart, Florida Canyon has undergone modernization and expansion efforts, including upgrades to equipment, heap-leach infrastructure, permitting expansions, and long-term mine planning initiatives.

Figure 3: Florida Canyon Location Map

Updated Mineral Resource Estimate

Mineral resources were re-estimated from the resource model released in 2024 and include historic waste rock stockpiles whose grade exceeds current cut-off grades for the Project. The updated Mineral Resource Estimate ("MRE") incorporates a revised geological interpretation that includes structural domains and shear controls. These changes improved grade continuity within mineralized zones and reduced dilution associated with previous estimation domains. The revised geological model includes infill, confirmatory and exploration drilling completed since 2024, together with historical drilling completed by previous operators. In total, the MRE is based on 5,454 drill holes totaling 665,423 meters ("m"). The updated MRE for Florida Canyon was modeled following industry-standard and Canadian Institute of Mining, Metallurgy & Petroleum ("CIM") compliant protocols.

Key steps included:

Verification of the drill hole database; Generation of drill hole intercepts for each shear zone; Statistical analysis of assay data; Compositing of assay intervals; Capping of outlier composite values; Geostatistical analysis, including variography; Construction of the block model and grade interpolation; Classification of the Mineral Resources; Validation of the block model; Calculation of cut-off grades; Pit optimization; Confirmation that reported blocks meet the RPEEE criteria; and Preparation of the Mineral Resource statement.

The MRE is constrained within an optimized pit shell generated using updated metal prices, metallurgical recoveries, operating costs and slope assumptions consistent with reasonable prospects for eventual economic extraction.

Table 3: Florida Canyon and Standard Mine MRE

| Mineral Resources | | Measured | Indicated | Measured & Indicated | Inferred | | | | | | | | | | GOLD (Au) | | Tonnes (kt) | Grade (g/t) | Ounces (koz) | Tonnes (kt) | Grade (g/t) | Ounces (koz) | Tonnes (kt) | Grade (g/t) | Ounces (koz) | Tonnes (kt) | Grade (g/t) | Ounces (koz) | | Florida Canyon Mine | Oxide | - | - | - | 171,842 | 0.31 | 1,706 | 171,842 | 0.31 | 1,706 | 53,312 | 0.25 | 433 | | Sulphide | - | - | - | - | - | - | - | - | - | 104,004 | 0.86 | 2,876 | | | Standard Mine | Oxide | - | - | - | - | - | - | - | - | - | 8,532 | 0.49 | 135 | | Sulphide | - | - | - | - | - | - | - | - | - | 30 | 1.47 | 1 | | | TOTAL | Mixed | - | - | - | 171,842 | 0.31 | 1,706 | 171,842 | 0.31 | 1,706 | 165,879 | 0.65 | 3,446 | | | | | | | | | | | | | | | | | Mineral Resources | | Measured | Indicated | Measured & Indicated | Inferred | | | | | | | | | | SILVER (Ag) | | Tonnes (kt) | Grade (g/t) | Ounces (koz) | Tonnes (kt) | Grade (g/t) | Ounces (koz) | Tonnes (kt) | Grade (g/t) | Ounces (koz) | Tonnes (kt) | Grade (g/t) | Ounces (koz) | | Florida Canyon Mine | Oxide | - | - | - | - | - | - | - | - | - | - | - | - | | Sulphide | - | - | - | - | - | - | - | - | - | - | - | - | | | Standard Mine | Oxide | - | - | - | - | - | - | - | - | - | - | - | - | | Sulphide | - | - | - | - | - | - | - | - | - | - | - | - | | | TOTAL | Mixed | - | - | - | - | - | - | - | - | - | - | - | - |

| Notes for Florida Canyon Mineral Resource Estimate

1. Mineral resources are reported, using the 2014 CIM Definition Standards, with an effective date of May 31, 2026. The qualified person as defined under NI 43-101 for the estimate is Ms. Terre Lane, MMSA QP, a Global Resource Engineering, Ltd. employee. Ms. Terre Lane is independent of the Company. 2. Mineral resources are reported inclusive of those mineral resources converted to mineral reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability. 3. Mineral resources are constrained within a conceptual open pit shell that uses the following assumptions: gold price of $2,650/oz; gold recoveries ranging from 43% to 67% for oxides and 80% for sulfides; reference mining cost of $2.79/t mined in-situ and $2.47/t mined fill; processing cost of $6.51/t processed for oxide crushed material and $4.23/t processed for oxide ROM material; processing cost of $26.30/t processed for sulfide material; general and administrative costs of $1.14/t processed; treatment and refining costs of 38.73/oz Au recoverable; royalty of $132.00/oz Au recoverable, and pit slope overall angles ranging from 30–36°. 4. Mineral resources are reported at a cut-off grade ranging from 0.13 g/t to 0.14 g/t for oxides and is 0.46 g/t for sulfides. 5. Mineral Resources include a stockpile of 1,094 kt at an average grade of 0.21 g/t and total contain gold of 6.78 Koz. 6. Mineral Resources include Heap Leach Inventory of 6,648 kt at an average grade of 0.29 g/t and total contained gold of 56.5 Koz. 7. Numbers have been rounded and may not sum. 8. The estimate of mineral resources may be materially affected by geology, environment, permitting, legal, title, taxation, sociopolitical, marketing, or other relevant issues.

Notes for Standard Mine Mineral Resource Estimate

1. Mineral Resources are reported, using the 2014 CIM Definition Standards, with an effective date of May 31, 2026. The Qualified Person for the estimate is Mr. Antoine Teixeira de Carvalho, P.Geo., an employee of BT Africa Mining Services. Mr. Antoine Teixeira de Carvalho is independent of the Company. 2. Mineral Resources are reported inclusive of those Mineral Resources converted to Mineral Reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. 3. Mineral Resources are constrained within a conceptual open pit shell that uses the following assumptions: gold price of US$2,650/oz; gold recoveries ranging from 43% to 66.7% for oxides and 80% for sulfides; reference mining cost of $2.79/ton mined in-situ and $2.47/ton mined fill; processing cost of $5.37/ton processed for oxide crushed material and $3.09/ton processed for oxide ROM material; processing cost of $25.16/ton processed for sulfide material; general and administrative costs of $1.14/ton processed; treatment and refining costs of $38.73/oz Au recoverable; royalty of $145.75/oz Au recoverable, and pit slope overall angles ranging from 30–43°. 4. Mineral Resources are reported at a cut-off grade ranging from 0.0038 oz/ton to 0.0071 oz/ton for oxides and is 0.0133 oz/ton for sulfides. 5. Numbers have been rounded and may not sum. 6. The estimate of mineral resources may be materially affected by geology, environment, permitting, legal, title, taxation, sociopolitical, marketing, or other relevant issues. |