F3 Uranium Reports Final 2025 Drilling Results from JR and Tetra Zones

• F3 Uranium Corp. (TSXV: FUU) (OTCQB: FUUFF) has released final assay results from its 2025 drilling programme at the Patterson Lake North Project, including the last two holes required for the upcoming maiden resource estimate at JR Zone.
• Hole PLN25-200 at JR Zone returned 8.5 metres of 3.4% U3O8, including 2.5 metres of 10.2% U3O8 and one metre of 20.7% U3O8 starting at 234 metres depth.
• At Tetra Zone, hole PLN25-217 intersected 26.5 metres of composite mineralisation between 340.5 and 406.5 metres, including a high-grade interval of 0.5 metres at 1.04% U3O8, located 55 metres along strike from the discovery hole.
• Exploration hole PLN25-207 intersected 0.06% U3O8 at 621 metres depth, approximately 200 metres from Tetra Zone, interpreted as part of the same structural system.
• The company has completed assays for all holes designated for inclusion in the maiden resource estimate at JR Zone, with drilling now focused on expanding the Tetra Zone discovery.

F3 Uranium Corp. (TSXV: FUU) (OTCQB: FUUFF) is a uranium exploration company focused on its 100% owned Patterson Lake North Project in Saskatchewan's Athabasca Basin. The 44,613-hectare project comprises three properties: Patterson Lake North (hosting the JR Zone), Minto, and Broach (hosting the Tetra Zone). The project is located near existing uranium deposits including Paladin's Triple R and NexGen Energy's Arrow projects. All three properties are accessible via Provincial Highway 955.

High-Grade Results at JR Zone and Tetra Zone

The 2025 drilling programme at JR Zone concluded with assays from hole PLN25-200, which returned 8.5 metres grading 3.4% U3O8 from 234.0 to 242.5 metres. Within this interval, the hole intersected 2.5 metres at 10.2% U3O8, further including one metre at 20.7% U3O8. The company classifies uranium mineralisation above 1.0% U3O8 as high-grade and above 20.0% U3O8 as ultra-high-grade. The hole also intersected 5.5 metres at 0.05% U3O8 from 246.5 to 252.0 metres. These were the final two holes completed for inclusion in the upcoming maiden resource estimate at JR Zone, located approximately 23 kilometres northwest of Paladin's Triple R deposit.

At Tetra Zone, located 13 kilometres south of JR Zone, hole PLN25-217 returned multiple mineralised intervals totalling 26.5 metres of composite mineralisation. The intersections included 5.5 metres at 0.19% U3O8, 6.5 metres at 0.14% U3O8, 3.5 metres at 0.41% U3O8, and 3.5 metres at 0.30% U3O8 from 400.0 to 403.5 metres, which contained 0.5 metres at 1.04% U3O8. This hole is positioned 55 metres along strike from discovery hole PLN25-205.

Sam Hartmann, Vice President Exploration, stated:

"At the Tetra Zone, we are releasing the second batch of assays since the initial high grade discovery hole (PLN25-205) assays, including an interval with high grade mineralization with 1.04% over 0.5m, confirmation of additional high-grade uranium mineralization at the Tetra Zone, 55m along strike from the discovery hole."

The drilling programme included 17 holes at JR Zone and Tetra Zone, with samples analysed at SRC Geoanalytical Laboratories in Saskatoon, an accredited facility under ISO/IEC 17025:2005. Samples were split into half sections with 0.5-metre standardised intervals where possible. All depth measurements are down-hole, with true thickness yet to be determined.

Tetra Zone Strike Extension and Deep Mineralisation

Drilling at Tetra Zone has extended the known mineralisation 55 metres along strike from the discovery hole. Hole PLN25-217 intersected mineralisation over a 66-metre vertical extent from 340.5 to 406.5 metres depth, comprising multiple stacked intervals. The mineralised intervals within this sequence ranged from 0.05% to 1.04% U3O8, with the highest grades occurring in discrete zones.

Exploration drilling identified uranium mineralisation at depth in hole PLN25-207, which intersected 0.5 metres at 0.06% U3O8 at 621.0 metres depth. This intersection is located approximately 200 metres away from the Tetra Zone and is interpreted to be associated with the same structural system.

Mr Hartmann commented:

"Exploration geochemistry around the Tetra Zone continues to return strongly anomalous uranium values with 0.06% U3O8 at depth in PLN25-217, approximately 200m away from Tetra Zone highlighting the prospectivity and size potential of the mineralized system."

The 2025 programme included exploration holes in areas designated as A1, B1, and PW, with several holes returning no mineralisation above 0.05% U3O8. The drilling results provide information on the structural controls and distribution of mineralisation across the property.

Completion of JR Zone Drilling for Resource Estimate

The final assay results from the 2025 programme complete the drilling data required for F3's maiden resource estimate at JR Zone. The resource estimate will be prepared in accordance with National Instrument 43-101 standards.

Mr Hartmann stated:

"We are pleased to release the final assays for JR Zone, where the last two holes for inclusion into the upcoming maiden resource estimate were completed earlier this spring."

The JR Zone database includes results from multiple drilling campaigns, with assays processed using standardised protocols including 0.5-metre sampling intervals and analysis at an accredited laboratory. Composite parameters used in reporting include a minimum thickness of 0.5 metres, an assay grade cut-off of 0.05% U3O8, and maximum internal dilution of 2.0 metres. Technical information has been reviewed and approved by Raymond Ashley, P.Geo., President and COO of F3 Uranium Corp., a Qualified Person under NI 43-101.

At Tetra Zone, the company continues drilling to define the extent of mineralisation along strike and at depth. The autumn 2025 programme, announced in October, targets further expansion of the Tetra Zone discovery with an additional 3,000 metres of drilling planned.

Next Steps

F3 Uranium has completed the final assays required for the maiden resource estimate at JR Zone, which represents the next milestone for the Patterson Lake North Project. The company continues drilling at Tetra Zone to define the extent of the newly discovered mineralisation. The autumn 2025 drill programme, which commenced in October, is focused on testing strike extension and depth potential at Tetra Zone with 3,000 metres of planned drilling.

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