F3 Uranium Corp (TSX-V: FUU) (OTCQB: FUUFF) is pleased to announce the assay results of Tetra Zone Discovery Hole PLN25-205 which returned a 1.0m high grade interval with 2.50% U₃O₈ within a 22.5m mineralized main interval averaging 0.26% U₃O₈ from 384.5m to 407.0m. A secondary mineralized zone above the main zone averaged 0.125% U₃O₈ over 3.5m from 377.5m to 381.0m.

Strong radioactivity in discovery hole PLN25-205 was first announced on April 15, 2025, on the Broach Lake Property, part of F3’s PLN Project. Drilling on the Tetra Zone is ongoing with one diamond drill and one sonic drill.

Tetra Zone Discovery Assay Highlights:

PLN25-205 (line 11310S):

• 0.5m @ 0.056% U₃O₈ (373.0m to 373.5m), and
• 3.5m @ 0.125% U₃O₈ (377.5m to 381.0m), and
• 22.5m @ 0.26% U₃O₈ (384.5m to 407.0m), including
• 0.5m @ 1.25% U₃O₈ (389.5m to 390.0m), and
• 1.0m @ 2.50% U₃O₈ (398.0m to 399.0m)

Map 1. Tetra Zone I Assay Results PLN25-205

Table 1. Drill Hole Summary and Uranium Assay Results

Samples from the drill core are split into half sections on site. Where possible, samples are standardized at 0.5m down-hole intervals. One-half of the split sample is sent to SRC Geoanalytical Laboratories (an SCC ISO/IEC 17025: 2005 Accredited Facility) in Saskatoon, SK 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 % U₃O₈ as “high grade” and results greater than 20.0 weight % U₃O₈ as “ultra-high grade”.

All depth measurements reported are down-hole and true thicknesses are yet to be determined.

About the Patterson Lake North Project:

The Company’s 42,961-hectare 100% owned Patterson Lake North Project (PLN) is located just within the south-western 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 23km northwest of Paladin’s Triple R deposit, the 19,864-hectare Minto Property, and the 19,022-hectare Broach Property hosting the Tetra Zone, F3’s newest discovery 13km 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, P.Geo., President & COO of F3 Uranium Corp, 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 (PLN) Project in the Western Athabasca Basin. F3 Uranium currently has 3 properties in the Athabasca Basin: Patterson Lake North, Minto, and Broach. The western side of the Athabasca Basin, Saskatchewan, is home to some of the world’s largest high grade uranium deposits including Paladin’s Triple R and Nexgen’s Arrow.