F4 Identifies Multiple Prospective Trends at Grey Island

Rhea-AI Summary

F4 Uranium (FFUCF) completed an airborne Mobile Magnetotellurics (Mobile MT) survey over the Grey Island Project in the southern Athabasca Basin on February 3, 2026. The survey identified multiple large-scale linear resistivity low features that define prospective conductive corridors and priority target areas.

The property lies ~70km west of Key Lake mine and ~60km east of Cameco's Centennial deposit. Nearby historic results include a 707ppm U sandstone sample 12km west and 0.015% U3O8 assays ~10km east. Only one documented drill hole exists on Grey Island, which showed alteration and basement graphite/pyrite.

Positive

• Mobile MT mapped multiple large-scale resistivity low corridors
• Property located ~70km of Key Lake mine and ~60km of Centennial deposit
• Nearby historic uranium occurrences: 707ppm U at 12km and 0.015% U3O8 at 10km
• Historic on-property drill hole reported sandstone bleaching and basement alteration

Negative

• Only one documented historic drill hole on the Grey Island property
• No follow-up ground geophysics or drilling completed on new MT targets yet

News Market Reaction – FFUCF

+6.86%

1 alert

+6.86% News Effect

On the day this news was published, FFUCF gained 6.86%, reflecting a notable positive market reaction.

Data tracked by StockTitan Argus on the day of publication.

Airborne MT Provides Modern Geophysics

Kelowna, British Columbia--(Newsfile Corp. - February 3, 2026) - F4 Uranium Corp (TSXV: FFU) ("F4" or "the Company") is pleased to announce that an airborne Mobile Magnetotellurics (Mobile MT) survey over the Grey Island Project in the southern Athabasca Basin has yielded very favorable geophysics results indicating multiple large scale linear resistivity features (Figure 1) which represent prospective corridors and provide promising target areas. The Grey Island Project is located 70km to the west of the Key Lake Mine owned by Cameco and Orano and 60km to the east of Cameco's Centennial uranium deposit.

The survey was completed by Expert Geophysics Surveys Inc and provided an up-to-date dataset characterizing the property's subsurface features and establishing an initial framework for future geological evaluation and follow-up exploration.

The Grey Island has seen very limited historical exploration; it is located near the Cable Bay Shear Zone (see Figure 1), a regional structural feature that is interpreted to be a prospective conductive corridor with known mineralized occurrences such as drill hole ND0801 drilled by Nuinsco, intersected 707ppm Uranium in a sandstone sample at the unconformity, just 12km to the west of the Grey Island Project. To the east, CanAlaska's Cree East property has seen assays up to 0.015% U₃O₈ approximately 10km from Grey Island. Only one documented drill hole FLM-08-05 (see Figure 1) has been completed on the property itself. This hole reported bleaching and alteration in the sandstone, along with pyritic and graphitic alteration in the basement rocks - the early geological signatures we look for within conductive packages as indicators of possible uranium bearing systems.

Erik Sehn, VP Exploration, commented:

"Grey Island represents our largest, and most underexplored land package in the southern Athabasca Basin. With only a single historic drill hole and outdated geophysical data available, we consider the Mobile MT survey as an important first step to assess the property for conductive trends. The results of this survey display large, linear resistivity low anomalies and merit further target generation, initially with detailed ground geophysics and eventually drilling."

About Grey Island:

F4 Uranium's 100% owned Grey Island Project lies within the Southern Athabasca Basin is located approximately 60km Northeast of the Key Lake Mine and approximately 10km to the east of the Cable Bay Shear Zone. The property consists of twenty-two claims spanning an area of 47,913 ha, but despite the large size is primarily unexplored with only one drill hole being completed on the property.

Figure 1. Grey Island 2025 Mobile MT Coverage.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10832/282459_2515cd09e45f1ace_002full.jpg

Qualified Person

The technical information in this news release has been reviewed and approved on behalf of the Company by Sam Hartmann, P.Geo., President & Chief Operation Officer of F4, and a qualified person as defined by National Instrument 43-101 - Standards of Disclosure for Mineral Projects.

This news release also refers to neighboring properties in which F4 Uranium has no interest, and the Qualified Person has been unable to verify the information from those properties. Mineralization on those neighboring properties is not necessarily indicative of mineralization on the Grey Island Property.

About F4 Uranium Corp:

F4 Uranium is a Canadian uranium exploration company focused on the Athabasca Basin in northern Saskatchewan, and the latest uranium explorer, lead by the same management and exploration team with a legacy of discovery successes. The project portfolio includes 17 wholly owned properties totaling roughly 157,000 ha, many of which are near uranium deposits including Paladin's Triple R, Nexgen Energy's Arrow and IsoEnergy's Hurricane projects. The assets were spun out of F3 Uranium in 2024, where the technical and management team made their third, and more recently fourth uranium discoveries at Patterson Lake North and Broach Lake. F4's core focus will be split between the west and east sides of the Athabasca Basin as the company is establishing itself as an explorer and project generator providing shareholders renewed exposure at an early stage.

Contact Information

F4 Uranium Corp.
750-1620 Dickson Avenue
Kelowna, BC V1Y9Y2

Investor Relations
Telephone: 778 484 8030
Email: ir@F4uranium.com

ON BEHALF OF THE BOARD,
"Ray Ashley"
Raymond Ashley, CEO
F4 Uranium Corp.

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.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/282459

FAQ

What did F4 Uranium (FFUCF) announce about the Grey Island Mobile MT survey on February 3, 2026?

F4 announced the Mobile MT survey identified multiple large-scale linear resistivity lows across Grey Island, marking prospective conductive corridors. According to the company, these anomalies provide initial target areas for detailed ground geophysics and eventual drilling to test for uranium mineralization.

How close is the Grey Island Project (FFUCF) to major Athabasca uranium deposits and why does that matter?

Grey Island lies about 70km west of Key Lake mine and 60km east of Centennial, indicating regional geological relevance. According to the company, proximity to known deposits places the property within a prospective structural setting for uranium-bearing conductive corridors.

What historic uranium results near Grey Island support FFUCF's exploration potential?

Historic nearby results include a 707ppm uranium sandstone sample 12km west and assays up to 0.015% U3O8 about 10km east. According to the company, these nearby occurrences increase the geological context supporting further target evaluation on Grey Island.

What is the current exploration status of Grey Island for FFUCF and what are the next steps?

Grey Island has only one documented historic drill hole and limited modern data; new Mobile MT results are first-step targets. According to the company, next steps are detailed ground geophysics for target refinement followed by targeted drilling to confirm mineralization.

Will the Mobile MT survey results for FFUCF guarantee uranium discovery at Grey Island?

No—geophysical anomalies indicate prospective corridors but do not confirm mineralization. According to the company, the Mobile MT results justify further ground work and drilling, which are required to establish any definitive uranium occurrences and resource potential.