Myriad Uranium Tests High-Pressure Slurry Ablation Success

Columbia, (Newsfile Corp. - September 22, 2026) - Myriad Uranium Corp. (CSE: M) (OTCQB: MYRUF) (FSE: C3Q) ("Myriad" or the "Company") is pleased to announce the results of an initial testing campaign conducted by DISA Uranium™ Corporation ("DISA Uranium") in 2026 with samples from Myriad Uranium. The primary objective of testing was to determine how efficiently DISA's high-pressure slurry ablation technology ("HPSA™") could concentrate uranium and improve recovery of uranium from the concentrated mass fraction.

HPSA™ test results indicate the following: - Effective particle size reduction (setting up the size-based separation that follows). - Meaningful reduction of uranium in the clean coarse material achieved (74.5% to 87.9%). Most of the uranium was successfully stripped out of the coarse rock, which is typically discarded as waste. - 78.8% reduction in Ra-226 activity and an 83.5% reduction in Th-230 activity, leaving cleaner waste material for handling and disposal. - Calculated recoveries of uranium in the fines concentrate were 83.9% (over the first-time interval sample) and 90.6% (over the second time interval sample). This is only a marginal increase in recovery over a longer period of ablation. - HPSA™ test results indicate that with minimal particle collisions, the process concentrated 83.9% of the uranium into 29.3% of the overall mass, i.e., a roughly 70% reduction in mass requiring further processing, while keeping most of the uranium.

The results of the testing campaign indicated that HPSA™ processing was successful in uranium liberation and recovery. Meaningful size reduction was also achieved. The percent reduction of uranium in the clean coarse material ranged from 74.5% to 87.9%. Meaningful reduction in radionuclide activity was also achieved. Significant amounts of uranium were recovered in the fines concentrate. ICP-MS indicated that HPSA™ technology was able to concentrate 83.9% of the uranium in 29.3% at the first time interval, and 90.6% of the uranium was concentrated in 37.5% of the mass at the second time interval sample. Uranium concentration in the fines concentrate was found to increase with additional turnovers.

Testing by Hazen Research (1976) for Union Pacific found greater than 92% uranium recovery (with most samples >96%) using a dilute sulphuric acid leach. This, combined with a preconcentration method such as HPSA™, could result in significant overall reduction in beneficiation costs.

DISA Uranium's HPSA™ Methodology and Results Myriad provided approximately 50 kg of sample material from its 2024 drilling campaign at Canning to DISA Uranium for HPSA™ testing. The HPSA™ process involves the collision of two slurry streams at high pressures to liberate minerals from gangue material for recovery in the fines concentrate. As particles collide at high velocities inside the HPSA™ collision chamber, they fracture at their natural grain boundary lines, which allows minerals to be liberated and recovered. Samples were collected at various time intervals in the unit to show increased liberation and recoveries over time.

The objectives of testing were to: - Provide elemental analysis before and after HPSA™ processing. - Analyse uranium and overall mass shifts at different collision intervals throughout HPSA™ processing. - Determine elemental recoveries in the minus 53-micron size fraction post-HPSA™ processing.

The composite sample was subjected to initial material characterization to determine particle size distribution (PSD), ICP-MS for uranium, and radionuclide activity analysis for Ra-226 and Th-230. This was followed by HPSA™ testing in a batch-style HPSA™ unit (Figure 1) under set parameters and variable testing times. Collected samples were then characterized by a PSD and ICP-MS for uranium. The elemental analysis by ICP-MS for uranium and radionuclide activity analysis for Ra-226 and Th-230 was performed by a third-party laboratory (Energy Labs).

Figure 1 HPSA test unit.

To view an enhanced version of this graphic, please visit: [provided link]

ICP-MS results indicated that the total percent reduction of uranium concentration ranged from 74.5% to 87.9%; the total percent recovery to the fines concentrate ranged from 83.9% to 90.6%. At the first time interval, 83.9% of the uranium was recovered in 29.3% of the mass. At the second time interval, the recovery of uranium increased by 6.72%, with an additional 8.19% of the mass in the fines concentrate relative to first (Table 1).

Table 1 Results summary of ICP-MS for uranium (bulk feed and HPSA products).