F3 - Extends Mineralization with 67.0m of Radioactivity at Tetra Zone

About this update from F3 Uranium Corp

Largest Radioactive Intervals to Date on Project Kelowna, British Columbia--(Newsfile Corp. - August 5, 2025) - F3 Uranium Corp (TSXV: FUU) (OTCQB: FUUFF) (" F3 " or " the Company ") is pleased to announce hand-held scintillometer results at Tetra Zone, where the widest intervals of radioactivity to date on the Patterson Lake North Project have been intersected with PLN25-217 , which intersected a total of 67.0m composite radioactivity between 299.5m and 414.5m, including 49.0m of continuous radioactivity between 347.5m and 396.5m. Additionally, PLN25-212 , approximately 23m up-dip of PLN25-217 and 31m along strike from the discovery hole PLN25-205, intersected the second widest interval to date with 39.5m composite radioactivity between 330.0m and 409.5m, including 27.5m of continuous radioactivity between 360.5m and 396.5m. 2025 Handheld Spectrometer Highlights: Tetra Zone PLN25-217 (line 11280S): 0.5m interval with radioactivity between 299.5m and 300.0m, and 0.5m interval with radioactivity between 315.5m and 316.0m, and 7.5m interval with radioactivity between 336.5m and 344.0m, and 49.0m interval with radioactivity between 347.5m and 396.5m, and 9.0m interval with radioactivity between 399.5m and 408.5m, and 0.5m interval with radioactivity between 414.0m and 414.5m. PLN25-212 (line 11310S): 2.5m interval with radioactivity between 330.0m and 332.5m, and 0.5m interval with radioactivity between 346.5m and 347.0m, and 0.5m interval with radioactivity between 354.0m and 354.5m, and 27.5m interval with radioactivity between 360.5m and 388.0m, and 6.0m interval with radioactivity between 394.0m and 400.0m, and 2.5m interval with radioactivity between 407.0m and 409.5m. Sam Hartmann, Vice President Exploration, commented: "The substantial radioactive widths intersected in these drill holes were truly unexpected and highlight the significant potential we see at the Tetra Zone. Despite challenging drilling conditions and the non-traditional style of mineralization, each hole provides valuable insights into deposit model generation and drill plan adaptations. Notably, PLN25-217 confirms a theorized strike direction deviating from the current conductor model, and we will continue to explore this trend. To improve our conductor modeling around the Tetra Zone area, we are planning a ground geophysical program based on a tighter grid to support larger step-outs along the Tetra Zone, which stands to reduce the number of drill holes required for targeting. Additionally, we cored two drill holes at the JR Zone using casings set last winter with PLN25-215 and -216, which tested for crosscutting structures; those assays will be included in our maiden resource estimate, expected in Q4. We are very excited and look forward to further uncovering this unique system hosting the Tetra Zone." Map 1. Broach Lake - Tetra Zone Scintillometer Results To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/8110/261242_985f0bcef4782a44_002full.jpg Map 2. Patterson Lake North - JR Zone Scintillometer Results To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/8110/261242_985f0bcef4782a44_003full.jpg Table 1: Drill Hole Summary and Handheld Spectrometer Results   Collar Information   * Hand-held Spectrometer Results  On Mineralized Drillcore  (>300 cps / >0.5m minimum)   Athabasca Unconformity Depth  (m)   Total  Drillhole Depth (m)   Hole ID   Section Line   Easting   Northing   Elevation   Az   Dip   From (m)   To (m)   Interval (m) Max CPS PLN25-211 11340S 589409 6397962 584 46 -75 160.50 161.00 0.50 320 160.9 548 PLN25-212 11310S 589368 6397970 584 40 -72 330.00 330.50 0.50 360 164.2 458 330.50 331.00 0.50 440 331.00 332.00 1.00 <300 332.00 332.50 0.50 310 346.50 347.00 0.50 330 354.00 354.50 0.50 380 360.50 361.00 0.50 410 361.00 362.00 1.00 <300 362.00 362.50 0.50 310 362.50 363.00 0.50 510 363.00 363.50 0.50 470 363.50 364.00 0.50 510 364.00 364.50 0.50 820 364.50 365.00 0.50 420 365.00 365.50 0.50 310 365.50 366.00 0.50 410 366.00 366.50 0.50 510 366.50 367.00 0.50 910 367.00 367.50 0.50 1100 367.50 368.00 0.50 1500 368.00 368.50 0.50 900 368.50 369.00 0.50 990 369.00 369.50 0.50 2500 369.50 370.00 0.50 3100 370.00 370.50 0.50 1400 370.50 371.00 0.50 560 371.00 371.50 0.50 1000 371.50 372.00 0.50 480 372.00 372.50 0.50 470 372.50 373.00 0.50 420 373.00 373.50 0.50 1100 373.50 374.00 0.50 680 374.00 374.50 0.50 3100 374.50 375.00 0.50 1700 375.00 375.50 0.50 930 375.50 376.00 0.50 370 376.00 376.50 0.50 330 376.50 377.00 0.50 320 377.00 377.50 0.50 390 377.50 378.00 0.50 460 378.00 378.50 0.50 2000 378.50 379.00 0.50 3000 379.00 379.50 0.50 3300 379.50 380.00 0.50 2500 380.00 380.50 0.50 700 380.50 381.00 0.50 960 381.00 381.50 0.50 3100 381.50 382.00 0.50 390 382.00 382.50 0.50 700 382.50 384.00 1.50 <300 384.00 384.50 0.50 310 384.50 385.00 0.50 670 385.00 385.50 0.50 320 385.50 386.00 0.50 670 386.00 387.50 1.50 <300 387.50 388.00 0.50 560 394.00 394.50 0.50 400 394.50 395.00 0.50 430 395.00 395.50 0.50 660 395.50 396.00 0.50 680 396.00 396.50 0.50 340 396.50 397.00 0.50 <300 397.00 397.50 0.50 380 397.50 398.00 0.50 340 398.00 398.50 0.50 2000 398.50 399.00 0.50 3000 399.00 399.50 0.50 1000 399.50 400.00 0.50 520 407.00 407.50 0.50 360 407.50 408.00 0.50 320 408.00 408.50 0.50 <300 408.50 409.00 0.50 360 409.00 409.50 0.50 350 PLN25-213 11325S 589359 6397959 584 45 -73 Pilot hole for wedged hole below 154.3 224 PLN25-213W1 11325S 589359 6397959 584 45 -73 278.00 278.50 0.50 750 154.3 434 278.50 279.00 0.50 430 279.00 279.50 0.50 550 326.00 326.50 0.50 530 326.50 328.50 2.00 <300 328.50 329.00 0.50 300 346.00 346.50 0.50 380 389.50 390.00 0.50 530 392.50 393.00 0.50 300 PLN25-214 11340S 589404 6397978 584 46 -75 342.00 342.50 0.50 860 155.7 507 342.50 343.00 0.50 430 382.50 383.00 0.50 360 PLN25-215 090S 587849 6410603 546 348 -59 249.00 249.50 0.50 370 194.4 281 249.50 250.00 0.50 710 250.00 250.50 0.50 330 252.50 253.00 0.50 350 257.50 258.00 0.50 320 PLN25-216 075S 587778 6410712 546 55 -64 169.50 170.00 0.50 310 194.3 239 211.50 212.00 0.50 2900 213.00 213.50 0.50 370 PLN25-217 11280S 589393 6398026 585 34 -85 299.50 300.00 0.50 300 160.1 575 315.50 316.00 0.50 460 336.50 337.00 0.50 310 337.00 338.00 1.00 <300 338.00 338.50 0.50 480 338.50 340.00 1.50 <300 340.00 340.50 0.50 450 340.50 341.00 0.50 650 341.00 341.50 0.50 320 341.50 343.00 1.50 <300 343.00 343.50 0.50 330 343.50 344.00 0.50 330 347.50 348.00 0.50 570 348.00 348.50 0.50 580 348.50 349.00 0.50 <300 349.00 349.50 0.50 340 349.50 350.00 0.50 <300 350.00 350.50 0.50 340 350.50 351.00 0.50 470 351.00 351.50 0.50 320 351.50 352.00 0.50 <300 352.00 352.50 0.50 700 352.50 354.50 2.00 <300 354.50 355.00 0.50 400 355.00 355.50 0.50 5100 355.50 356.00 0.50 730 356.00 356.50 0.50 910 356.50 357.00 0.50 <300 357.00 357.50 0.50 1000 357.50 358.00 0.50 910 358.00 358.50 0.50 1100 358.50 359.00 0.50 490 359.00 359.50 0.50 360 359.50 360.00 0.50 630 360.00 360.50 0.50 680 360.50 361.00 0.50 350 361.00 361.50 0.50 540 361.50 362.00 0.50 1200 362.00 362.50 0.50 430 362.50 363.00 0.50 680 363.00 363.50 0.50 540 363.50 364.00 0.50 330 364.00 364.50 0.50 810 364.50 365.00 0.50 610 365.00 365.50 0.50 1000 365.50 366.00 0.50 1100 366.00 367.00 1.00 <300 367.00 367.50 0.50 510 367.50 368.00 0.50 420 368.00 368.50 0.50 <300 368.50 369.00 0.50 340 369.00 369.50 0.50 820 369.50 370.00 0.50 1900 370.00 370.50 0.50 3300 370.50 371.00 0.50 2200 371.00 371.50 0.50 3500 371.50 372.00 0.50 8500 372.00 372.50 0.50 4500 372.50 373.00 0.50 1100 373.00 373.50 0.50 630 373.50 374.00 0.50 1200 374.00 374.50 0.50 1300 374.50 375.00 0.50 1300 375.00 375.50 0.50 800 375.50 376.00 0.50 310 376.00 376.50 0.50 300 376.50 377.00 0.50 620 377.00 377.50 0.50 760 377.50 378.00 0.50 1700 378.00 378.50 0.50 2100 378.50 379.00 0.50 2600 379.00 379.50 0.50 2700 379.50 380.00 0.50 1400 380.00 380.50 0.50 720 380.50 381.50 1.00 <300 381.50 382.00 0.50 2600 382.00 382.50 0.50 520 382.50 383.00 0.50 1500 383.00 383.50 0.50 360 383.50 384.00 0.50 680 384.00 384.50 0.50 450 384.50 385.00 0.50 <300 385.00 385.50 0.50 300 385.50 386.00 0.50 520 386.00 387.00 1.00 <300 387.00 387.50 0.50 350 387.50 388.00 0.50 370 388.00 388.50 0.50 440 388.50 389.00 0.50 480 389.00 389.50 0.50 2100 389.50 390.00 0.50 6400 390.00 390.50 0.50 4400 390.50 391.00 0.50 4500 391.00 391.50 0.50 2400 391.50 392.00 0.50 3200 392.00 392.50 0.50 750 392.50 393.00 0.50 <300 393.00 393.50 0.50 420 393.50 394.00 0.50 400 394.00 394.50 0.50 550 394.50 395.00 0.50 350 395.00 395.50 0.50 680 395.50 396.00 0.50 700 396.00 396.50 0.50 360 399.50 400.00 0.50 360 400.00 400.50 0.50 3600 400.50 401.00 0.50 5800 401.00 401.50 0.50 2000 401.50 402.00 0.50 500 402.00 402.50 0.50 <300 402.50 403.00 0.50 420 403.00 403.50 0.50 530 403.50 404.00 0.50 320 404.00 405.00 1.00 <300 405.00 405.50 0.50 300 405.50 406.00 0.50 <300 406.00 406.50 0.50 370 406.50 407.00 0.50 400 407.00 407.50 0.50 310 407.50 408.00 0.50 <300 408.00 408.50 0.50 300 414.00 414.50 0.50 420   Handheld spectrometer composite parameters: 1: Minimum Thickness of 0.5m 2: CPS Cut-Off of 300 counts per second 3: Maximum Internal Dilution of 2. 0m The natural gamma radiation detected in the drill core, as detailed in this news release, was measured in counts per second (cps) using a handheld Radiation Solutions RS-125 spectrometer which has been calibrated by Radiation Solutions Inc. The Company designates readings exceeding 300 cps on the handheld 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 between a spectrometer and 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 0.5m 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. 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 is a uranium exploration company, focusing on the high-grade JR Zone and new Tetra Zone discovery 13km to the south in the PW area on its Patterson Lake North (PLN) Project in the Western Athabasca Basin. F3 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 project and NexGen's Arrow project. Forward Looking Statements This news release contains certain forward-looking statements within the meaning of applicable securities laws. All statements that are not historical facts, including without limitation, statements regarding future estimates, plans, programs, forecasts, projections, objectives, assumptions, expectations or beliefs of future performance, including statements regarding the suitability of the Properties for mining exploration, future payments, issuance of shares and work commitment funds, entry into of a definitive option agreement respecting the Properties, are "forward-looking statements." These forward-looking statements reflect the expectations or beliefs of management of the Company based on information currently available to it. Forward-looking statements are subject to a number of risks and uncertainties, including those detailed from time to time in filings made by the Company with securities regulatory authorities, which may cause actual outcomes to differ materially from those discussed in the forward-looking statements. These factors should be considered carefully and readers are cautioned not to place undue reliance on such forward-looking statements. The forward-looking statements and information contained in this news release are made as of the date hereof and the Company undertakes no obligation to update publicly or revise any forward-looking statements or information, whether as a result of new information, future events or otherwise, unless so required by applicable securities laws. The TSX Venture Exchange and the Canadian Securities Exchange have not reviewed, approved or disapproved the contents of this press release, and do not accept responsibility for the adequacy or accuracy of this release. F3 Uranium Corp. 750-1620 Dickson Avenue Kelowna, BC V1Y9Y2 Contact Information Investor Relations Telephone: 778 484 8030 Email: [email protected] ON BEHALF OF THE BOARD "Dev Randhawa" Dev Randhawa, CEO To view the source version of this press release, please visit https://www.newsfilecorp.com/release/261242

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