Mr. Dominique Doucet reports

SIRIOS DISCOVERS HIGH-POTENTIAL GOLD HALO IN WESTERN SECTOR OF AQUILON PROJECT IN EEYOU ISTCHEE JAMES BAY, QUEBEC

Sirios Resources Inc. has released assay results from the 2025 summer diamond drilling campaign on its Aquilon gold project, located in Eeyou Istchee James Bay, Quebec.

Thirteen drill holes totalling 5,420 metres were completed in the summer of 2025. Targets were grouped in a previously underexplored area located west of the historical gold showings.

Highlights

Discovery of a strongly anomalous gold halo hosted in felsic volcanic rocks

The anomalous zone extends over more than one kilometre in length and several hundred metres in width and remains open in all directions, indicating significant potential for expansion.

The halo is defined by 538 core samples from six drill holes, totalling 601 metres of discontinuous intervals.

Gold grades are locally up to 10.3 grams per tonne gold, with a weighted average grade of 0.26 g/t Au across the halo.

The gold-mineralized halo forms a north-south-trending corridor dipping eastward, consistent with the geological and structural interpretation for this sector of the Aquilon project.

Key drill intervals:

• Hole AQ25-119:
  • 2.55 g/t Au over 4.8 m, including 10.3 g/t Au over 1.0 m;
  • 5.51 g/t Au over 1.0 m;
  • 2.34 g/t Au over 1.1 m;
  • 0.95 g/t Au over 3.7 m, including 2.32 g/t Au over 0.9 m;
• Hole AQ25-118:
  • 1.12 g/t Au over 4.0 m, including 3.01 g/t Au over 1.0 m;
  • 2.85 g/t Au over 1.2 m;
  • 0.92 g/t Au over 5.1 m, including 2.31 g/t Au over 1.1 m;
  • 1.08 g/t Au over 4.0 m, including 2.81 g/t Au over 1.0 m;
• Hole AQ25-113: 2.78 g/t Au over 1.2 m;
• Hole AQ25-123: 2.09 g/t Au over 1.0 m.

Metallogenic review and additional sampling

The 2025 drilling results outline a new mineralization context on the Aquilon project, characterized by a few high-grade gold intervals surrounded by a lower-grade but broadly distributed halo within a large rock volume. Sirios has initiated a review of lithogeochemical data and metallogenic models applicable to Aquilon.

Following the drilling results, an additional core sampling program totalling 1,496 metres was completed last week to infill unsampled intervals within the gold corridor. These forthcoming assay results will help refine the corridor's geometry and average grades.

The western sector of Aquilon had already emerged as a priority area following the delineation of gold-in-soil anomalies during 2023 and 2024 sampling campaigns. The integration of these soil surveys with detailed geological interpretation and a high-resolution drone magnetic survey completed in 2025 led to the definition of the targets tested in the current drilling program.

The drilling program is financed by Sumitomo Metal Mining Canada (Sumitomo), with Sirios as operator. By completing this program, Sumitomo is entitled to gain a 51-per-cent interest in the Aquilon project as its commitment in Aquilon then exceeding $4.8-million (see press release dated Dec. 19, 2022).

About the Aquilon project

The Aquilon gold project consists of 140 mineral claims covering an area of 68 square kilometres. It is located in Eeyou Istchee James Bay, Quebec, 10 kilometres 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) (see press releases dated June 26, 2008, and Jan. 19, 2011). Additional information is available on the recently updated Aquilon web page.

Analytical quality control

All NQ-calibre 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 quality assurance/quality control program was implemented, incorporating blanks and certified reference standards into the sample sequence. Gold assays were performed by ALS Global using fire assay with an atomic absorption finish on a 50-gram subsample. Samples returning greater than one g/t Au as well as those containing visible gold, were reassayed by fire assay with metallic screening on a one-kilogram sample.

Dominique Doucet, PEng, and Roger Moar, PGeo, qualified persons under National Instrument 43-101, have reviewed and approved the scientific and technical information in this press release.

About Sirios Resources Inc.

Sirios Resources is a mining exploration company based in Quebec, focused on developing its portfolio of high-potential gold projects in the Eeyou Istchee James Bay, Canada.

We seek Safe Harbor.