Jaguar Uranium Reports Final Copper Assay Results Including up to 8.54% Copper, Potential 4-km Trend Identified from Huemul Uranium-Copper-Vanadium Project

Channel and rock chip samples from areas of visible uranium-copper-vanadium mineralization observed at surface returned final assay results for copper (up to 8.54%), uranium (up to 2.27%), silver (up to 708 g/t) and vanadium (up to 1.27%) 1 .

Sampling of strike extensions along the Uryco/Rosa and Black zone trends has identified a potential 4-kilometre-long trend of copper mineralization exposed at surface One over-limit sample result for uranium (>25,000 ppm) is still pending.

Table 1 Highlights for Cu above 2.0%, based on final assay results at Huemul, include:

TORONTO , Aug. 18, 2026 /PRNewswire/ -- Jaguar Uranium Corp. (NYSE-AM: JAGU) ("Jaguar") is pleased to announce final assay results for copper from its initial rock sampling program (announced on July 20, 2026) at the Huemul Uranium-Copper-Vanadium (U-Cu-V) Project, located in Malargüe, Mendoza Province, Argentina across the more than 27,000-hectare district-scale project.

The Company is planning a maiden drill campaign at the project which includes a past producing mine.

Table 1 Highlights for Cu above 2.0%, based on final assay results at Huemul, include:

Figure 1 Huemul Project Target and Surface Sampling Locations.

Figure 2 Uranium and copper surface sampling results along the Huemul Mine – Agua Botada Trend.

Figure 3 Uranium and copper surface sampling results along the Uryco-Rosa, Black Zone and Vega Larga Trend.

______________________________ 1 Because sampling was selective and targeted areas of visible mineralization, the results may be biased high and should not be considered representative of grade distribution, continuity or mineralization across the Huemul Project

One Management Commentary

"These results reinforce what drew us to Huemul in the first place. Copper grades as high as 8.54%, paired with strong uranium and vanadium values across multiple target areas, support our view that this historic district has considerable exploration potential. We're moving quickly toward a maiden drill campaign to test these targets at depth," said Steven Gold, President & Chief Executive Officer.

A District with Documented Historical Production

The Huemul Project is anchored by Argentina's first-ever producing uranium mine, commissioned in 1955 and operated continuously until 1975 by the Comisión Nacional de Energía Atómica (CNEA). Historical records report that approximately 130,000 tonnes of mineralized material, historically described as ore, were processed at the Malargüe plant, with reported average head grades of 0.21% uranium, 2.0% copper and 0.11% vanadium (source: Guillermo Rojas, 1999. Distrito Uranìfero Pampa Amarilla, Mendoza. En Recursos Minerales de la Republica Argentina. Pag.1135-1140).

The Company has not independently verified the historical production records or historical head-grade information, and such information should not be interpreted as current exploration results, a mineral resource estimate, a mineral reserve estimate or evidence of current economic viability.

The project hosts uranium-copper-vanadium mineralization in a classic sandstone-hosted deposit setting. The broader Malargüe Mining District remains largely untested by modern exploration methods. Based on the presence of a former producing mine, historical exploration data, and the extent of the Company's land package, management believes the project warrants further systematic exploration.

Sampling Program

Jaguar conducted targeted sampling included outcrop, subcrop, rock chip composite, channel and float samples, across areas of visible surface mineralization. Field observations were generally consistent with the presence of mineralization described in historical reports, particularly around the former Huemul mine, as described previously here. Samples were collected from eight target areas, namely, Huemul Mine, Agua Botada, Uryco, Rosa, Vega Larga, Black Zone, Cerro Mirano and Lucy (Figure 1). Channel samples were collected over intervals ranging from 50 cm to 280...