¹The stated potential quantity and grade is conceptual in nature, and there has been insufficient exploration to define a mineral resource, and it is uncertain if further exploration will result in the target being delineated as a mineral resource; Conclusions from a third-party updated Technical Report (with an effective date November 25, 2024) establish a baseline Exploration Target Model for the Lac 50 Deposit, ranging between 60.8 M lbs U3O8 and 98.2 M lbs U3O8, with an average grade range of 0.37% U3O8 and 0.48% U3O8; a copy of which is available on the Company’s SEDAR+ profile at www.sedarplus.ca; The QP provided ranges for potential uranium quantity and grade as a target for further exploration on the Lac 50 Deposit using the available verified diamond drillhole data, including the 2024 drill program results.  The ranges were derived from conceptual vein wireframes, drill core assays, grade interpolation, and applied uncertainty ranges.

²HISTORICAL DRILLING AND OUTCROP SAMPLES

Certain noted technical information provided herein has been derived exclusively and without independent verification from the following reports. Such information is historical in nature and is not considered by the Company to be current. In each case, the reliability of the historical information is considered reasonable by the Company. The historical information provides an indication of the exploration potential of the properties but may not be representative of expected results. Readers should read the entirety of such noted reports to fully understand the nature of the information referenced herein. Samples, including, without limitation, outcrop samples, by their nature, are selective in nature and significant variations may be seen from sample to sample. Accordingly, sample information may not be representative of the true underlying mineralization.

For additional information regarding ATHA’s Angilak project please refer to the Technical Report entitled “NI 43-101 Technical Report for the Angilak Property, Kivalliq Region, Nunavut, Canada” with an effective date of February 5, 2024 prepared by Michael B. Dufresne, M.Sc. P. Geol., P.Geo. and Philo Schoeman, M.Sc., P.Geo., Pr.Sci.Nat. , each of whom is a “qualified person” under NI 43-101, available under ATHA’s SEDAR+ profile at www.sedarplus.ca.

³DOWNHOLE GAMMA PROBE

A Mount Sopris 40TGU-1000 Triple Gamma Geiger down hole probe was utilized for radiometric surveying.

The Company considers high-grade mineralization to be any interval with radioactivity derived from downhole gamma probe >10,000 CPS. The total gamma results provided were selected using an average cutoff of 500 CPS over intervals of 0.1 metre width. All drill intercepts are core width and true thickness is yet to be determined. Core samples are submitted to the Saskatchewan Research Council (SRC) Geoanalytical Laboratories in Saskatoon. The SRC facility is ISO/IEC 17025:2005 accredited by the Standards Council of Canada (scope of accreditation #537). The samples are analyzed for a multi-element suite using partial and total digestion inductively coupled plasma methods, for boron by Na2O2 fusion, and for uranium by fluorimetry.

⁴EXPLORATION TARGET MODEL

For additional information regarding ATHA’s Angilak project please refer to the Technical Report entitled “Technical Report on the Angilak Property, Nunavut, Canada” with an effective date of November 25, 2024 prepared by Matt Batty, MSc, P. Geo, who is a “qualified person” under NI 43-101, available under ATHA’s SEDAR+ profile at www.sedarplus.ca.