Viridian Confirms Basin-Scale Plumbing Systems and Copper-Bearing Chemical Traps at the Sedna Project

Executive Summary

• Viridian Metals demonstrated a basin‑scale, crustal‑scale “plumbing” system beneath the Sedna Project that links deep‑sourced copper‑rich fluids to extensive reduced horizons at surface.
• Integrated magnetotelluric (MT) data and surface mapping identified north‑south deep structural breaks and east‑west corridors extending >100 km, defining large copper traps across >2,600 km² of the Seal Basin.
• The results de‑risk the project, shifting focus from a single target to an emerging district‑scale sediment‑hosted copper system, and support next‑phase permitting and airborne geophysical work.

Key Details

• Plumbing System: MT survey imaged deeply rooted north‑south structural breaks interpreted as primary fluid highways; surface mapping identified laterally extensive east‑west corridors (>100 km).
• Copper Traps: Delineated reduced stratigraphic horizons extending tens of kilometres, providing fertile traps for copper precipitation.
• Disseminated Mineralization: Fine‑grained chalcopyrite disseminated throughout these horizons explains historic under‑recognition and aligns with large sediment‑hosted districts.
• Project Scale: Sedna Project now covers >2,600 km², securing dominant control of the Seal Basin – one of Canada’s largest contiguous exploration footprints.
• Survey Execution: 71 MT stations collected in fall 2025 using Phoenix instrumentation (10 kHz–0.001 Hz). Data processed by Moombarriga Canada Inc.; 3‑D inversion achieved nRMS ≈ 1.6, indicating high data quality.
• Next Steps – Access & Targeting: Permitting underway for trail and central staging area; initial focus on the Kendall target (≈ 600 m strike). Planning a basin‑scale airborne geophysical survey to map reduced horizons and intersect plumbing structures.
• Technical Review: Qualified Person Tyrell Sutherland, P.Geo., President & CEO, reviewed and approved all technical disclosures per NI 43‑101.

Notable Quotes

“We have moved from a theoretical model to a proven framework… By confirming both the deep‑rooted plumbing systems and the extensive copper‑bearing horizons, we have significantly de‑risked the project.” – Tyrell Sutherland, President & CEO

Materiality Assessment: Material – Positive (the release provides substantive new geological evidence that materially enhances the valuation outlook for Viridian’s flagship Sedna Project).