Fusion Fuel Highlights Jaguar Uranium's Surface Uranium-Copper-Vanadium Findings at Huemul Project; Planned Royal Uranium Acquisition Expected to Provide 1.0% NSR Royalty Exposure

Huemul Project is centered on Argentina's first producing uranium mine; Jaguar reports visible surface mineralization, a potential 4-kilometer copper trend, first-ever sampling of historic mine dumps, and 200 rock samples submitted for assay Dublin, Ireland, June 04, 2026 (GLOBE NEWSWIRE) -- Fusion Fuel Green PLC (NASDAQ: HTOO) (“Fusion Fuel” or the “Company”), a leading provider of full-service energy engineering, advisory, and utility solutions, today highlighted exploration progress reported by Jaguar Uranium Corp. (“Jaguar”) at the Huemul Uranium-Copper-Vanadium Project (the “Huemuel Project”) in Mendoza Province, Argentina, a project in which Royal Uranium Inc. (“Royal Uranium”) is believed to hold a 1.0% net smelter return (“NSR”) royalty interest. Fusion Fuel's previously announced planned acquisition of a controlling interest in Royal Uranium is expected to provide the Company with royalty exposure to the Huemul Project, a 27,350-hectare district-scale project centered on Argentina's first producing uranium mine.