Sirios intercepts 2.4 g/t Au over 48.5 m at Cheechoo

More than 13,000m of drilling and 33 holes completed since the start of summer 2026 drilling

Montreal, Quebec--(Newsfile Corp. - August 20, 2026) - Sirios Resources Inc. (TSXV: SOI) (OTCQB: SIREF) (FSE: 377A) ("Sirios" or "the Company") announces the assay results of the first 5 holes totaling 1,753 m of Phase 1 drilling at its Cheechoo gold project, located in the Eeyou Istchee Baie-James region of Quebec, Canada.

Highlights from these first results include:

2.40 g/t Au over 48.5 m , including 77.65 g/t Au over 1.1 m (CH26-326)

1.49 g/t Au over 37.6 m (CH26-326)

1.16 g/t Au over 32.2 m , including 12.88 g/t Au over 1.5 m (CH26-327)

2.28 g/t Au over 10.3 m, including 10.39 g/t Au over 1.5 m (CH26-327)

0.77 g/t A u over 10.3 m (CH26-300E)

Visible Gold in 8 Drill Holes Visible gold has been observed in several locations in 8 drill holes, including drill hole CH26-326, and 7 others for which assay results are pending. To date, 33 holes have been completed and four more are in progress for a total drilled length of 13,555 meters, including the extension of hole #300 (CH26-300E). Four drill rigs remain in operation at Cheechoo.

"We are pleased with the initial results of our 2026 summer drilling program," said Dominique Doucet, Head of Exploration for Sirios. "From the very first holes, good results were obtained both outside and within the conceptual pit of our resources, confirming the potential for expansion of the deposit in the tonalite as well as the depth extension of the metasedimentary zone to the east."

"These preliminary results, which represent less than 10% of the planned drill holes, support our thesis that the resource at Cheechoo has the potential to become more significant than indicated in the 2025 resource estimate," said Jean-Félix Lepage, CEO of Sirios. "With four active drill rigs, we anticipate completing Phase 1 in S