Sirios Intercepts 0.26 g/t Gold over 298.2 Metres at Aquilon

Sampling assay results confirm continuity of the high-potential gold-bearing halo at project in Eeyou Istchee Baie-James, Québec

Sirios Resources Inc. (TSXV: SOI,OTC:SIREF) reports assay results from an additional sampling program performed on 1,496 metres of drill core from its Aquilon gold project in the Eeyou Istchee Baie-James region of Québec. Results from six drill holes that were continuously sampled along their entire core length further define a gold-bearing halo that was discovered in 2025. The halo extends laterally for more than 700 metres from south to north and over a width of 300 metres dipping eastward, according to the geological and structural interpretation of the area.

"These results remind me of the very first drilling results we obtained in 2012 on our Cheechoo project," said Dominique Doucet, founder and Chief Executive Officer of Sirios. "Among others, the first drill hole at Cheechoo returned 0.21 g/t Au over 191.4 metres, from surface to the end of the hole. This only highlights the strong potential of Aquilon."

The recent assay results confirm the continuity of the gold-bearing halo and define significant thicknesses reaching up to 298.2 metres along the drill hole (apparent thickness). The anomalous gold corridor extends to a vertical depth of 373 metres in drill hole AQ25-119. It remains open in all directions, including at depth, indicating strong potential for further extension. In addition, other anomalous gold intervals, which cannot be correlated with the main corridor and are located to its north, were identified through the sampling program. These intervals may correspond to one or more additional gold-bearing zones.

Updated key drill Intercepts incorporating results from the additional sampling program

Note: *Already published on 12/04/2025
** Historical drill holes included in the additional sampling program
*** Reported thicknesses are along the drill hole

Thirteen drill holes totaling 5,420 metres were completed in 2025 (see press release dated December 4, 2025). This led to the discovery of a new mineralization setting on Aquilon, characterized by several high-grade gold intervals surrounded by a lower-grade halo. The mineralization occurs continuously within a large rock volume in a sparsely explored area located west of the historical gold showings.

The 2025 drilling program was funded by Sumitomo Metal Mining Canada (Sumitomo), with Sirios acting as operator. By completing this program, Sumitomo fulfilled the Phase 1 requirements of the option agreement and earned a 51% interest in the project, having invested more than C$4.8 million in Aquilon. Going forward, all exploration programs on the Aquilon project will now be jointly funded by Sumitomo and Sirios in proportion to their respective ownership interests, according to the joint venture agreement.

Figure 1: Location of 2025 drilling program at Aquilon Project

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Figure 2: Final results from 2025 exploration program at Aquilon Project

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Figure 3: New interpreted gold anomalous area (vertical section) at Aquilon Project

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Parameters of the 2025 drilling program

About the Aquilon Project
The Aquilon gold project consists of 140 mineral claims covering an area of 68 km². It is in Eeyou Istchee James Bay. Quebec, 10 km south of the Laforge-1 hydroelectric power station and is easily accessible by all-season roads. To date, 32 gold showings have been discovered on the project. Some drill intercepts from the Aquilon project are among the highest grades obtained in Quebec, including 12,906.5 g/t Au over 0.2 m (Lingo showing), 3,527.4 g/t Au over 0.4 m (Moman showing) and 133.67 g/t Au over 0.8 m (Fleur-de-Lys showing) (ref. press releases of 26/06/2008 and 19/01/2011). Additional information is available on the recently updated Aquilon webpage at sirios.com/en/aquilon.

About Sirios Resources
Sirios Resources is a Canada-based mining exploration company focused on the development of the Cheechoo gold deposit and on the exploration of its portfolio of high-potential gold projects in the Eeyou Istchee James Bay region of Quebec.

Qualified person, quality assurance, and quality control
Dominique Doucet, P.Eng., CEO of Sirios and Roger Moar, P.Geo., qualified persons under National Instrument 43-101, have reviewed and approved the scientific and technical information in this press release. Mr. Moar was acting, since 2004, as Qualified Person on Aquilon on behalf of a previous partner and is full time senior geologist at Sirios since 2017.

All NQ caliber drill cores from the Aquilon project were logged and sampled by Sirios personnel. The cores were split in half, with one half sent to a certified commercial laboratory for analysis and the other half retained for future reference. A strict QA/QC program was implemented, incorporating blanks and certified reference standards into the sample sequence. Gold assays were performed by ALS Global Val-d'Or laboratory, Qc, Canada using fire assay with an atomic absorption finish on a 50 g subsample.

Cautionary Note Regarding Forward-Looking Statements
This press release contains "forward-looking statements" within the meaning of applicable Canadian securities laws based on expectations, estimates and projections as of the date of this press release. Forward-looking statements involve risks, uncertainties and other factors that could cause actual events, results, performance, expectations and opportunities to differ materially from those expressed or implied by such forward-looking statements. Factors that could cause actual results to differ materially from those indicated in such forward-looking statements include, but are not limited to: capital and operating costs that differ materially from estimates; the tentative nature of metallurgical test results; delays or failures in obtaining required governmental, environmental or other approvals; uncertainties related to the availability and cost of necessary financing in the future changes in financial markets; inflation; fluctuations in metal prices; delays in project development; other risks relating to the mineral exploration and development industry; and risks disclosed in public filings of the Company on SEDAR+ at www.sedarplus.ca. Although the Company believes that the assumptions and factors used in preparing the forward-looking statements contained in this news release are reasonable. Readers should not place undue reliance on this information, which speaks only as of the date of this news release, and there can be no assurance that such events will occur or occur within the time periods presented. The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law.

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