New High-Grade Assay Results Reinforcing Resource Expansion Potential

ORONTO – I-80 Gold Corp. reported on 2025 drilling campaign at the Granite Creek Underground Project. New assay results from 40 holes continue to demonstrate robust high-grade mineralization throughout the South Pacific Zone (SPZ) confirming expansion of the mineralized envelope and potential for mineral resource expansion to the north and at depth.
The Project is i-80 Gold’s first underground gold operation and ramp-up activities continue to advance toward steady-state gold output. The Company is currently mining the top of the southern portion of the SPZ. Granite Creek Underground hosted a measured and indicated gold mineral resource estimate of 261,000 ounces at 10.5 grams per tonne and an inferred gold mineral resource of 326,000 ounces at 13.0 grams per tonne. Granite Creek Underground is located along the prolific Getchell Trend in northern Nevada, approximately 10 kilometers south of Nevada Gold Mines’ Turquoise Ridge Complex which currently hosts an estimated 18 million ounces of measured and indicated gold mineral resources and 2.5 million ounces of inferred gold mineral resources.
A total of 16,000 meters were drilled over 46 holes as part of the 2025 drilling program at Granite Creek Underground, which began in June 2025 and concluded in December 2025. The overall program included an additional six infill holes relative to the original plan to test and confirm continuity of mineralization ahead of the planned feasibility study. The results of seven step-out holes, as part of the overall program, reinforced the Company’s belief in the potential to expand mineralization at SPZ and ultimately extend the Project’s mine life.
“The 2025 infill drilling results at Granite Creek Underground successfully support our geological model, confirming the continuity and high-grade nature of the deposit. The South Pacific Zone remains open to the north and at depth and will continue to be tested through additional drilling in the coming years,” stated Tyler Hill, Vice President Geology. “The drill program was a key step in advancing the upcoming Granite Creek Underground feasibility study. Importantly, these drill results reinforce our view that similar success could be achieved with the planned 2026 drill programs at Archimedes underground and Mineral Point open pit on the Ruby Hill property. This confidence is supported by comparable results from our Cove underground project, which shares a similar structural framework and sedimentary rock-hosted disseminated mineralization present within each of these projects.”