F3 Uranium Intersects 2.30m Exceeding 10,000 cps at Tetra Zone in 15-Metre Step-Out Drilling

• Drill hole PLN25-219A intersected 2.30m of material exceeding 10,000 counts per second (cps), with a peak reading of 30,500 cps, representing the highest radioactivity recorded to date at the Tetra Zone.
• The drill hole successfully intersected mineralization 15 metres down-plunge from hole PLN25-217, confirming the northwest plunge direction of the mineralised structures.
• A continuous 27.5m radioactive interval was recorded between 392.0m and 419.5m depth, containing six separate intervals exceeding 10,000 cps.
• The mineralisation occurs in altered and sheared gneissic units with clay, hematite, sericite and bleaching alteration, whilst graphite and sulphides are absent.
• The Fall 2025 programme aims to define the orientation of shears hosting the Tetra Zone, with drilling planned to continue in both up-plunge and down-plunge directions.

F3 Uranium Corp. (TSXV: FUU) (OTCQB: FUUFF) is a uranium exploration company focused on the Patterson Lake North Project in Saskatchewan's Athabasca Basin. The company's 42,961-hectare project comprises three properties: Patterson Lake North (hosting the JR Zone), Minto, and Broach (hosting the Tetra Zone located 13 kilometres south of the JR Zone). The properties are accessed via Provincial Highway 955 and are located near Paladin's Triple R and NexGen's Arrow deposits in the western Athabasca Basin.

High-Grade Radioactive Intercept at Tetra Zone

Drill hole PLN25-219A encountered a total radioactive interval of 29.5m, of which 27.5m was continuous between 392.0m and 419.5m depth. Within this interval, six sections exceeded 10,000 cps. The highest reading occurred in a 0.75m section between 398.50m and 399.25m, peaking at 30,500 cps. Other intervals exceeding 10,000 cps included 0.35m at 22,800 cps, 0.60m at 14,500 cps, 0.20m at 12,800 cps, 0.20m at 11,000 cps, and 0.20m at 10,200 cps. An additional 2.0m radioactive zone was intersected between 384.0m and 386.0m.

Counts per second (cps) measurements are taken using a handheld Radiation Solutions RS-125 spectrometer calibrated by Radiation Solutions Inc. The company designates readings exceeding 300 cps as "anomalous" and readings above 10,000 cps as "highly radioactive". The company notes that spectrometer measurements do not directly or consistently correlate with uranium grades and should be regarded as a preliminary indicator of radioactive material presence. Laboratory assay results are pending.

The radioactivity occurs within altered and sheared gneissic units displaying clay, hematite, sericite and bleaching alteration features. Sam Hartmann, Vice President Exploration, stated that graphite and sulphides are absent in the system, correlating with weak conductive responses from ground electromagnetic surveys. Samples from drill core are sent to SRC Geoanalytical Laboratories in Saskatoon for analysis, including a 63-element suite with uranium measured by ICP-MS.

Step-Out Drilling Confirms Northwest Mineralization Orientation

Drill hole PLN25-219A was designed to test mineralization 15 metres down-plunge from hole PLN25-217, which was reported in August 2025. The successful intersection of the mineralised zone confirms the northwest plunge direction of the uranium mineralisation within the sheared structures.

Sam Hartmann, Vice President Exploration, stated:

"This fall drill program is intended to confirm the orientation of the shears hosting the Tetra Zone. These initial drill intercepts validate a plunge direction of the uranium mineralization to the northwest, with PLN25-219A successfully intercepting 15m down-plunge from PLN25-217."

The confirmation of structural orientation provides a framework for planning additional drill holes.

Sam Hartmann, Vice President Exploration, stated:

"We will continue drilling this system in both directions - up-plunge and down-plunge."

A second hole, PLN25-218, experienced excessive dip and azimuth deviation and did not intersect the target zone. The hole encountered minor radioactive intervals at various depths but did not reach the main mineralised structure.

The company has provided geological cross-sections and a long-section diagram to illustrate the spatial relationship between drill holes and the interpreted plunge direction. All depth measurements reported are down-hole, and true thicknesses have not yet been determined. The company notes that mineralization on neighbouring properties is not necessarily indicative of mineralization on the Patterson Lake North Project.

Fall 2025 Drill Programme at Broach Property

The current drilling takes place on the Broach Property, which covers 19,022 hectares and is part of the Patterson Lake North Project. The Broach Property hosts the Tetra Zone, located 13 kilometres south of the JR Zone on the Patterson Lake North Property. The Patterson Lake North Project is situated on the south-western edge of the Athabasca Basin, approximately 23 kilometres northwest of Paladin's Triple R deposit.

The Fall 2025 programme focuses on the Tetra Zone, with drilling aimed at confirming the orientation of uranium-bearing structures. The company has reported initial scintillometer results from this ongoing programme, with two holes (PLN25-218 and PLN25-219A) completed on lines 11265S and 11250S. Hole PLN25-219 was abandoned at 41 metres depth, and hole PLN25-219A was drilled as a replacement from the same collar location.

All three properties comprising the Patterson Lake North Project are accessed by Provincial Highway 955. The technical information has been reviewed and approved by Raymond Ashley, P.Geo., President and COO of F3 Uranium Corp., who serves as the Qualified Person under National Instrument 43-101.

Conclusion

F3 Uranium has reported scintillometer results from drill hole PLN25-219A at the Tetra Zone, including 2.30m exceeding 10,000 cps within a 27.5m continuous radioactive interval. The successful 15-metre step-out from previous drilling confirms the northwest plunge direction of mineralization. The company plans to continue drilling in both up-plunge and down-plunge directions to further define the extent of the mineralised system. Laboratory assay results from the drill core are pending and will provide uranium grade information to complement the preliminary scintillometer readings.

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