Mr. Dev Randhawa reports

F3 - HITS RADIOACTIVITY IN 32M STEP OUT - EXTENDING ZONE AT BROACH LAKE

F3 Uranium Corp. has grown the strike of the radioactivity at the PW area on the Broach property -- now named the Tetra zone -- with PLN25-210, which intersected a total of 21.0 metres of composite radioactivity in a 32-metre stepout along strike to the northwest from discovery hole PLN25-205, which intersected radioactivity over a total of 33.0 m, including 0.56 m of high radioactivity (greater than 10,000 counts per second) with a peak of 37,700 cps at 398.34 m (see news release dated April 15, 2025). The Tetra zone remains open in both directions and drilling is continuing.

Geophysical and structural modelling of the Tetra zone is advancing, and F3 is now mobilizing an LS600 Sonic drill to the zone; this will improve the pace of overburden casing and increase targeting accuracy -- a technique deployed successfully at the JR zone during delineation drilling.

2025 hand-held spectrometer highlights

Broach Lake -- Tetra zone, PLN25-210 (Line 11280S):

• 0.5 m interval with radioactivity of 700 cps between 165.0 and 165.5 m;
• 0.5 m interval with radioactivity of 450 cps between 308.0 and 308.5 m;
• 0.5 m interval with radioactivity of 690 cps between 332.0 and 332.5 m;
• 2.0 m interval with radioactivity of 340 cps between 349.0 and 351.0 m;
• 3.0 m interval with radioactivity of 1,500 cps between 354.5 and 357.5 m;
• 0.5 m interval with radioactivity of 920 cps between 364.0 and 364.5 m;
• 3.5 m interval with radioactivity of 900 cps between 367.5 and 371.0 m;
• 3.5 m interval with radioactivity of 1,200 cps between 380.0 and 383.5 m;
• 7.0 m interval with radioactivity of 2,600 cps between 388.5 and 395.5 m.

Sam Hartmann, vice-president, exploration, commented: "Bringing a sonic drill back to site will allow us to more efficiently define, delineate and expand the highly radioactive core seen in PLN25-205. PLN25-210 represents a 32 m stepout grid west and validated our geological and structural models, which will be used for further along-strike drilling. The sonic drill will help reduce drill trace deviation as seen in PLN25-207 and allow for intersection of the target areas exactly where intended. Assays from the discovery hole PLN25-205 are being rushed and the results will be released once complete and reviewed. Over all, we are very encouraged by the geology in these initial drill holes at Tetra, which is currently the best exploration target in the F3 portfolio."

The natural gamma radiation detected in the drill core, as detailed in this news release, was measured in counts per second using a hand-held Radiation Solutions Inc. RS-125 spectrometer, which has been calibrated by Radiation Solutions. The company designates readings exceeding 300 cps on the hand-held spectrometer (occasionally referred to as a scintillometer in industry parlance; this colloquial usage stems from historical naming conventions and the shared functionality of detecting gamma radiation a scintillometer) as anomalous, readings above 10,000 cps as highly radioactive and readings surpassing 65,535 cps as off scale. However, readers are cautioned that spectrometer or scintillometer measurements often do not directly or consistently correlate with the uranium grades of the rock samples and should be regarded solely as a preliminary indicator of the presence of radioactive materials.

Samples from the drill core are split into half sections on site. Where possible, samples are standardized at 0.5-metre downhole intervals. One-half of the split sample is sent to SRC Geoanalytical Laboratories (an SCC ISO/IEC 17025:2005-accredited facility) in Saskatoon, Sask., while the other half remains on site for reference. Analysis includes a 63-element suite including boron by ICP-OES, uranium by ICP-MS and gold analysis by ICP-OES and/or AAS.

The company considers uranium mineralization with assay results of greater than 1.0 weight per cent U3O8 as high grade and results greater than 20.0 weight per cent U3O8 as ultrahigh grade.

All depth measurements reported are downhole and true thicknesses are yet to be determined.

About the Patterson Lake North project

The company's 42,961-hectare, 100-per-cent-owned Patterson Lake North (PLN) project is located just within the southwestern edge of the Athabasca basin in proximity to Paladin's Triple R and NexGen Energy's Arrow high-grade uranium deposits, an area poised to become the next major area of development for new uranium operations in Northern Saskatchewan. The PLN project consists of the 4,074-hectare Patterson Lake North property hosting the JR zone uranium discovery approximately 23 kilometres northwest of Paladin's Triple R deposit, the 19,864-hectare Minto property and the 19,022-hectare Broach property hosting the Tetra zone, F4's newest discovery 13 kilometres south of the JR zone. All three properties comprising the PLN project are accessed by Provincial Highway 955.

Qualified person

The technical information in this news release has been prepared in accordance with the Canadian regulatory requirements set out in National Instrument 43-101 and approved on behalf of the company by Raymond Ashley, PGeo, president and chief operating officer of F3 Uranium, a qualified person. Mr. Ashley has reviewed and approved the data disclosed.

About F3 Uranium Corp.

F3 Uranium is a uranium exploration company, focusing on the recently discovered high-grade JR zone on its Patterson Lake North project in the western Athabasca basin. F3 Uranium currently has three properties in the Athabasca Basin: Patterson Lake North, Minto and Broach. The western side of the Athabasca basin in Saskatchewan is home to some of the world's largest high-grade uranium deposits, including Paladin's Triple R and Nexgen's Arrow.

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