Sirios Files Cheechoo Gold Project MRE Report on SEDAR: 1.3 Moz Indicated at 1.12 g/t Au, 1.7 Moz Inferred at 1.23 g/t Au

Executive Summary

• Sirios Resources filed a NI 43‑101 Technical Report on SEDAR announcing an updated 2025 Mineral Resource Estimate for the Cheechoo Gold Deposit.
• The estimate shows a material increase in both grade and ounces versus the 2022 MRE: 1.3 Moz indicated at 1.12 g/t Au and 1.7 Moz inferred at 1.23 g/t Au, including a new underground component of 446,000 oz at 3.09 g/t Au.
• The company outlined a two‑phase follow‑up work program (PEA and additional drilling) to further advance the project toward economic evaluation.

Key Details

• Resource Summary – Pit‑constrained:
• Indicated: 34,993,000 t @ 1.12 g/t Au = 1,262 koz
• Inferred: 38,222,000 t @ 1.01 g/t Au = 1,242 koz
• Underground Component – Stope‑constrained inferred: 4,493,000 t @ 3.09 g/t Au = 446 koz.
• Total Resources (combined cut‑offs) – Indicated 34.99 Moz; Inferred 42.72 Moz; total 1,688 koz at 1.23 g/t Au.
• Grade Improvements vs. 2022 MRE – Open‑pit indicated grade up 19% (0.94 → 1.12 g/t); inferred grade up 38% (0.73 → 1.01 g/t).
• Strip Ratio: Low at 2.9:1 for open‑pit scenario.
• Exploration Target: Conceptual 31–40 Moz of mineralization grading 1.27–1.45 g/t Au.
• Drill Data Basis: 345 holes, 82,717 m total (8,660 m drilled since 2022), 56,337 assays; composites created at 1.5 m intervals with capping (25 g/t for high‑grade zones).
• Modelling Details: Ordinary Kriging and inverse distance methods used; block size 5 × 5 × 5 m (sub‑blocks to 0.625 m); pit optimization via Deswik pseudoflow algorithm, underground via Deswik.SO.
• Qualified Persons: Pierre Luc Richard, P.Geo. (PLR Resources) – QP for the MRE; contributions from Stephen Coates (Evomine) and Christian Laroche (Synectiq).
• Follow‑up Work Program:
• Phase 1: Completion of a Preliminary Economic Assessment (PEA) on the Cheechoo Deposit.
• Phase 2: Additional drilling to expand the resource, identify new targets, and conduct metallurgical testwork.
• Forward‑Looking Statements: The release contains forward‑looking information regarding future drilling, PEA results, permitting, financing, and market conditions.

Notable Quotes

“I congratulate our technical team and consultants for the excellent work showcased in this technical report… Cheechoo continues to deliver: gold ounces are up, grades are up, and the exploration targets remain numerous and highly promising.” – Dominique Doucet, President & CEO, Sirios Resources

All figures are presented as reported in the NI 43‑101 Technical Report; resources are not reserves and have no demonstrated economic viability.