Myriad Uranium Reports Initial Slurry Ablation Test Results From Copper Mountain Project

• Uranium Concentration: DISA Uranium's HPSA technology placed 83.9% of the uranium into 29.3% of the sample mass at the first testing interval, rising to 90.6% in 37.5% of the mass at the second.
• Grade Increase: The fine concentrate graded 977 parts per million (ppm) uranium at the first interval, up from a starting grade of 306 ppm.
• Coarse Fraction Results: Uranium in the coarse material fell by 74.5% to 87.9% across the two testing intervals.
• Radionuclide Reduction: Radium-226 activity in the coarse material fell by 78.8% and thorium-230 activity by 83.5%.
• Historical Leach Data: 1976 testing for Union Pacific recovered more than 92% of uranium, with most samples above 96%, using a dilute sulphuric acid leach.

Myriad Uranium Corp. (CSE: M) (OTCQB: MYRUF) (FSE: C3Q) is a Canada-based uranium exploration company that holds a 100% interest in the Copper Mountain Uranium Project in Wyoming, USA. Copper Mountain contains several historic uranium deposits and past-producing mines, including the Arrowhead Mine, which produced about 500,000 pounds of U₃O₈ (uranium oxide, the standard traded form of uranium). Union Pacific drilled around 2,000 holes and advanced mine planning at the project in the late 1970s before the 1980 uranium market downturn, investing an estimated C$125 million in 2026 dollars. Myriad also holds a 10% free carried interest in the Red Basin Uranium Project, meaning it retains a share without funding development costs, and owns the Breccia Pipe Project in Arizona, which covers at least 23 targets prospective for uranium and rare earth elements.

DISA Uranium HPSA Technology Concentrating 83.9% to 90.6% of Uranium Into 29% to 37% of Mass at Copper Mountain Demonstrating Significant Pre-Concentration Potential

Myriad supplied about 50 kilograms of sample material from its 2024 drilling at Canning to DISA Uranium, a Casper, Wyoming company that holds patented high-pressure slurry ablation (HPSA) technology. The process collides two streams of slurry (crushed rock mixed with water) at high pressure. The particles fracture along their natural grain boundaries, separating uranium minerals from waste rock so they collect in a fine fraction smaller than 53 microns (0.053 millimetres).

Samples were taken at two time intervals. At the first, 83.9% of the uranium was recovered in 29.3% of the mass. At the second, recovery reached 90.6% in 37.5% of the mass. The fine concentrate graded 977 ppm uranium at the first interval, compared with a calculated starting grade of 306 ppm.

President and CEO Thomas Lamb said:

"Simply put, initial tests confirm that the process can reduce rock mass by about 70%, while producing a 3-fold increase in grade. More testing will be required at scale, but this is a highly encouraging initial result."

70% to 88% Reduction in Uranium From Coarse Waste Fraction With Meaningful Radionuclide Activity Reduction Supporting Cleaner Waste Handling

The coarse material remaining after HPSA processing, which is typically discarded as waste, showed a 74.5% to 87.9% reduction in uranium content. Uranium in this fraction fell from 128 ppm in the untreated sample to 78 ppm at the first interval and 37 ppm at the second.

The testing also measured radionuclides, which are naturally occurring radioactive elements found alongside uranium. At the first interval, radium-226 activity in the coarse material fell by 78.8% and thorium-230 activity by 83.5%, leaving cleaner material for handling and disposal.

Uranium content was measured using ICP-MS, a laboratory technique that detects very small concentrations of elements, and radionuclide activity was also analysed. Both sets of analyses were carried out by Energy Labs, an independent third-party laboratory.

Historical High-Grade Acid Leach Recovery Data Combined With HPSA Pre-Concentration Pointing to Significant Beneficiation Cost Reduction Pathway

Beneficiation refers to the steps used to upgrade ore and extract the valuable metal. Early leach testing at Copper Mountain by Hazen Research in 1976 for Union Pacific recovered more than 92% of the uranium, with most samples above 96%, using a dilute sulphuric acid solution.

Combined with a pre-concentration method such as HPSA, these leach recoveries could result in a significant overall reduction in beneficiation costs. Under this approach, HPSA would first reduce the volume of material, and acid leaching would then be applied to the smaller concentrate stream.

Longer processing time increased uranium recovery by 6.72% while adding 8.19% more mass to the concentrate. Full-scale results are expected to align closely with the first interval from the laboratory batch unit, and the process can be engineered and optimised according to target recoveries and mass pull (the share of total material that reports to the concentrate).

Milestones and Next Steps

The initial HPSA testing campaign on Copper Mountain material is complete. Further testing at scale is required, with future work aimed at optimising the selective liberation of uranium particles to increase recovery. Myriad also intends to conduct additional work to determine whether Copper Mountain's historical estimates can be verified and supported by current mineral resource estimates.

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