Argyle Resources samples 99.9% SiO2 at Saint Gabriel

Executive Summary

• Argyle Resources Corp. reported high-purity silica assay results from its 2025 prospecting program at the 100%-owned Saint Gabriel Project in Quebec, with four grab samples returning SiO2 values above 99%.
• The highest result was 99.90% SiO2 from a quartzite sample near the historical Lac Rigo showing, while all assays in that locality exceeded 97% SiO2.
• A new high-purity silica zone was identified approximately 800 meters west of the Lac Rigo showing, prompting plans for expanded follow-up work to define the continuity, scale, and lateral extent of the mineralization.

Key Details

• Project Location & Tenure: Saint Gabriel Project, 100%-owned, ~1,312.90 hectares across 23 contiguous claims, Gaspe Peninsula, Quebec (~42 km east of Rimouski).
• Program Scope: Four-day prospecting and sampling campaign completed in Fall 2025 targeting quartz-rich lithologies (arenite, quartz arenite, quartzite, quartz interbedded siltstone).
• Sampling & Analysis: 17 grab samples submitted to ALS Canada Ltd. for whole rock geochemical analysis using 48-element four-acid ICP MS (ME MS61) and whole rock package ICP AES (ME ICP06).
• Top Assay Results:
• Sample 6 (quartzite): 99.90% SiO2
• Sample 14 (quartz mudstone): 99.70% SiO2
• Sample 13 (quartzite): 99.50% SiO2
• Sample 11 (quartz arenite): 99.20% SiO2
• New Western Zone: High-purity silica zone identified ~800m west of Lac Rigo showing, yielding a cluster of high-grade results (99.2%, 99.5%, 99.7% SiO2), confirming mineralization outside historical showings.
• Lac Rigo Showing: Consistent high silica values across all sampled areas, with all assays exceeding 97% SiO2.
• QA/QC Protocols: Certified reference standards (OREAS 232b) and blanks inserted at regular intervals; samples prepared in Ontario and analyzed by ALS (ISO/IEC 17025 accredited).
• Next Steps: Expanded field reconnaissance, detailed mapping, and sampling to evaluate continuity and scale of both the Lac Rigo and newly identified western zones. Surface access managed parcel-by-parcel due to private landowner surface rights.
• Qualified Person: George Yordanov, PGeo, Director, reviewed and approved technical disclosures per NI 43-101.

Notable Quotes

• "These results reinforce the high-purity silica potential at Saint Gabriel, with multiple samples returning greater than 99 per cent SiO2, including a peak value of 99.9 per cent SiO2 near Lac Rigo," said Jeffrey Stevens, president and chief executive officer. "Importantly, the identification of additional high-grade material in a previously unexplored area west of Lac Rigo strengthens our confidence that Saint Gabriel may host more than one high-quality silica zone, and we look forward to advancing targeted follow-up work to better define continuity and scale."