Announcement • Jun 04

Fusion Fuel Green PLC Highlights Jaguar Uranium Surface Uranium-Copper-Vanadium Findings at Huemul Project and Reports Planned Royal Uranium Acquisition for 1.0% NSR Royalty Exposure

Fusion Fuel Green PLC highlighted exploration progress reported by Jaguar Uranium Corp. at the Huemul Uranium-Copper-Vanadium Project in Mendoza Province, Argentina, a project in which Royal Uranium Inc. is believed to hold a 1.0% net smelter return royalty interest. According to a press release issued by Jaguar on June 2, 2026, its recent field campaign at the Huemul Project observed visible uranium-copper-vanadium mineralization at surface, identified a potential 4-kilometer copper trend, and indicated that uranium, copper, and vanadium mineralization appear, based on visual inspection and historical data, to be contained in historic mine dumps that were assessed for the first time. Jaguar also reported that 200 rock samples have been collected and submitted for laboratory analysis, with assay results pending. Key developments reported by Jaguar include: Visible uranium-copper-vanadium mineralization observed at surface, with assay results pending; 200 rock samples collected and submitted for laboratory analysis across prospective targets; A potential 4-kilometer copper trend identified at the Uryco zone; Historic mine dumps sampled for the first time, representing a previously untested area for further evaluation; Historical records indicating average head grades of approximately 0.21% uranium, 2.0% copper, and 0.11% vanadium, subject to Jaguar's caution that these historical results have not been independently verified; and Project location within a district anchored by Argentina's first producing uranium mine, which operated from 1955 to 1975. Through Fusion Fuel's previously announced planned acquisition of a controlling interest in Royal Uranium, the Company expects to gain capital-efficient royalty exposure to potential future production from the Huemul Project. Under the NSR royalty structure, following completion of the planned Royal Uranium transaction, Fusion Fuel would be positioned to receive a percentage of revenue from any future mineral production at the Huemul Project, net of certain deductions, without bearing direct exploration, development, or operating costs at the project. Jaguar also noted that the Huemul Project is supported by a broader critical minerals policy backdrop, including the U.S.-Argentina Critical Minerals Framework and Jaguar's 2026 collaboration agreement with the Province of Mendoza. Jaguar cautioned that visual observations are qualitative in nature, that assay results remain pending, and that historical results, including historical head grades, have not been independently verified by Jaguar and should not be treated as current mineral resources or mineral reserves. Jaguar further stated that no conclusions can be drawn regarding grade, continuity, or economic potential pending receipt of assay results and further analysis.

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