Florida Canyon feasibility study shows US$0.8 billion after-tax free cash flow over 8-year mine life

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 PR Newswire TSXV:  ITR ; NYSE American: ITRG www.integraresources.com VANCOUVER, BC , June 25, 2026 /PRNewswire/ - 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 flow 2 and 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 prices 3 ; After-tax NPV of ~$723 M using spot metal prices 4 .

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 th