Mr. Thomas Lamb reports

MYRIAD URANIUM'S PRELIMINARY INTERPRETATION OF HIGH-RESOLUTION GEOPHYSICS AT COPPER MOUNTAIN PROVIDES STRONG ADDITIONAL VALIDATION FOR DISTRICT-SCALE URANIUM ENDOWMENT. GROUND-TRUTHING PROGRAM UNDERWAY

Myriad Uranium Corp. has completed preliminary interpretation of data from its large-scale, high-resolution airborne magnetic and radiometric survey flown over the Copper Mountain uranium project in December, 2025. The company has now commenced systematic ground truthing to validate new anomalies and refine new drill targets.

Myriad's chief executive officer, Thomas Lamb, commented: "All known historic uranium resources and almost all known targets at the Copper Mountain uranium project are located west of the major north-south structural corridor [...]. They stand out in the violet signatures just west of the corridor [...]. However, in what is entirely new information, the overwhelming majority of radiometric anomaly points generated by our recent district-scale airborne survey occur in untested ground east of that structural corridor. As soon as we saw this result, we moved quickly to secure the eastern ground, and, last week, we initiated systematic ground truthing. Initial field inspections are returning elevated radiometric counts consistent with the airborne data, and we are encouraged by these early indications. We expect to provide details regarding our expanded land position shortly, followed by results from the ongoing validation program. This process will also provide additional targets for our phase 2 drill program planned to start in Q2."

Helicopter survey results

Preliminary interpretation indicates:

• Known deposits are correlated with magnetic and radiometric signatures;
• Magnetic and equivalent uranium (eU) signatures are spatially coincident;
• Extensive radiometric anomalies occur across the district;
• Structural features, together with these anomalies, are consistent with the hydrothermal alteration model of mineralization control;
• Large number of new anomaly clusters have been identified in previously underexplored eastern extensions.

The combined magnetic and radiometric data set supports the interpretation of a large hydrothermal system capable of hosting additional uranium mineralization beyond historically drilled areas. More than 100 anomaly points have been prioritized for field validation, the vast majority of which are located to the east of the north-south structural corridor.

Ground truthing program

In response to these developments, Myriad has now commenced with fieldwork to ground truth selected radiometric anomaly points. The aim of the fieldwork is to:

• Confirm the presence and intensity of anomalous uranium mineralization;
• Characterize the geological setting, structural and alteration controls;
• Assess the relative scale and continuity of anomalies;
• Identify and refine priority drill targets.

Initial results are consistent with airborne anomaly responses. Further updates will follow as work progresses.

Geophysical survey

The survey was completed by Precision Geosurveys, based out of Reno, Nev., using an Airbus AS350 helicopter. The survey area covered an extent of approximately 191.8 square kilometres, with a total of 2,114 line kilometres completed at 100-metre line spacing and with 1,000-metre tie lines at a flying height of 30 metres in a north-south orientation.

Magnetic data were collected using a Scintrex CS-3 (or geometrics equivalent) cesium vapour airborne magnetometer sensor, sensitivity better than 0.01 nanotesla and sampling rate of 20 hertz providing sample spacings of one to two metres, in a nose-mounted stinger configuration with three-axis real-time compensation. Two or more base station magnetometers with integrated GPS (Global Positioning System) time synchronization were used for correction of temporal magnetic variations. Radiometric data were collected using a Medusa gamma spectrometer system: 21 litres of proprietary self-calibrating NaI(Tl) gamma radiation detection crystals with 512-channel output at one-hertz sampling rate. Position control was achieved using an WAAS-enabled (wide-area augmentation system) GPS navigation system integrated with pilot steering display and data logger. In good weather conditions, flight line accuracy of plus or minus eight metres from desired track was achieved. Elevation control was achieved using an Opti-Logic laser altimeter (or equivalent) and height-above-ground pilot display and recording.

After the survey was completed, several procedures were undertaken by Precision Geosurveys to ensure that the data met a high standard of quality. Magnetic and radiometric data were converted into Geosoft or ASCII file formats using Nuvia Dynamics and Medusa Gamman software. Further processing was carried out using Geosoft Oasis Montaj 2025.1 geophysical processing software, along with proprietary processing algorithms. These included position corrections, lag correction, flight height and digital terrain model corrections, magnetic processing, flight compensation, temporal variation correction, heading correction, IGRF (international geomagnetic reference field) removal, levelling and microlevelling. Outputs for magnetic data included reduction to magnetic pole (RTP), calculation of horizontal gradient (CHG), calculation of vertical gradient (CVG) and analytic signal (AS). Radiometric processing and outputs involved aircraft and cosmic background extractions, radon finder, full-spectrum elevation airborne correction, conversion to apparent radioelement concentrations, radiometric ratios and ternary radioelement image map.

Qualified person and data verification

The scientific or technical information in this news release respecting the company's Copper Mountain project has been reviewed and approved by George van der Walt, MSc, PrSciNat, FGSSA, Myriad's consulting geologist and a qualified person as defined in National Instrument 43-101, Standards of Disclosure for Mineral Projects. Mr. van der Walt has verified the information disclosed by reviewing all available data on which such information is based. There were no limits on the verification process.

About Myriad Uranium Corp.

Myriad Uranium holds a 75-per-cent interest in the Copper Mountain uranium project in Wyoming, United States, with a definitive agreement in place to acquire the remaining 25-per-cent interest from Rush Rare Metals Corp.'s Copper Mountain, which hosts multiple historic uranium deposits and past-producing mines, including the Arrowhead mine (approximately 500,000 pounds U3O8 (triuranium octoxide) produced). The district saw extensive exploration and development by Union Pacific in the late 1970s, including approximately 2,000 boreholes and advanced mine planning prior to uranium market downturn conditions in 1980. Union Pacific is estimated to have invested approximately $117-million (2024 dollars) in exploration and development at Copper Mountain, generating significant historical resource estimates. The company also holds a 100-per-cent interest in the Red Basin uranium project in New Mexico, hosting near-surface mineralization with expansion potential.

We seek Safe Harbor.