Cosa identifies two km of sandstone alteration at MLN
Executive Summary
- Cosa Resources’ summer drilling identified ~2 km of strong sandstone alteration and graphitic faulting along the Cyclone trend at the Murphy Lake North (MLN) joint‑venture project.
- The drill program intersected up to 30 m of unconformity relief and extensive basement‑rooted fault zones, with six of seven holes showing positive structural/alteration results.
- Cosa has satisfied its $1.5 M financing obligation, retains a 70 % irrevocable interest in MLN, and plans follow‑up drilling in early 2026.
Key Details
- Project Overview: Murphy Lake North is a 70 % (Cosa) / 30 % (Denison Mines) JV located in the eastern Athabasca Basin, Saskatchewan.
- Drilling Summary: 3,323 m drilled in eight holes; focus on Cyclone trend after winter‑2025 Hurricane results.
- Cyclone Trend:
- Four sections over 2.4 km strike length; six of seven holes intersected positive alteration/structure.
- Up to 30 m of unconformity relief identified.
- Section 2600E showed a 70‑m interval with strong fracturing, fault gouges, clay increase, bleaching, desilicification and decimeter‑scale radioactivity spikes.
- Graphitic basement fault zone extends through the full 220‑m sandstone thickness.
- Hurricane Trend Follow‑up: Hole MLN25‑006 (400 m stepout) intersected improved alteration (93 m of lower sandstone with bleaching, clay alteration, and fault‑controlled basement alteration).
- Exploration Space: Alteration zone remains open in multiple directions; untested strike length up to 1.2 km identified for future drilling.
- Financial Commitment: Cosa met its sole financing obligation of $1.5 M for summer exploration, confirming its irrevocable 70 % interest.
- Future Plans: Pending geochemical results will guide a follow‑up drill program slated for early 2026.
Notable Quotes
“The results of the Murphy Lake North summer drill program… are the most significant to date for Cosa… further support our thesis that ample search space remains for the next uranium discovery in the infrastructure‑rich eastern Athabasca basin.” – Keith Bodnarchuk, President & CEO, Cosa Resources
“Summer drilling at Cyclone identified over two kilometres of highly prospective strike length… The intensity and continuity of sandstone alteration and structure… is an encouraging indicator of the trend’s prospectivity.” – Andy Carmichael, Vice‑President, Exploration, Cosa
“We are excited to continue working with Cosa to plan and execute a follow‑up drill program at Murphy Lake North in early 2026.” – Chad Sorba, VP Technical Services & Project Evaluation, Denison (technical adviser)