Northwire Canada EditionSunday, July 26, 2026
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Drill Results Routine +

Cosa Reports Anomalous Radioactivity in Multiple Drill Holes at the Murphy Lake North Joint Venture with Denison Mines

Tagline: Denison Mines Advances Phoenix Construction While JV Partner Cosa Delivers Drill Hits

By The Northwire Desk — AI Analysis Apr 13, 2026 · 08:01 DML · 4.93 Denison Mines Corp.
Executive Summary
  • The most recent release (April 13, 2026) reports anomalous radioactivity in three of five drill holes at the Murphy Lake North (MLN) Joint Venture.
  • Hole MLN26-013 intersected a continuous 5-metre interval (>1,000 cps) with a peak >13,000 cps, consistent with the March 24 announcement.
  • Additional holes (MLN26-014 and MLN26-016) also showed anomalous radioactivity (>350 cps), confirming the trend is not isolated to a single hole.
  • Radioactive zones remain open for at least 600 metres to the east and west within the Cyclone alteration corridor.
  • Chemical assays are pending; summer drilling is planned for 2026.
  • A marketing services agreement was entered with Northern Venture Group (C$10,000/month).
  • Context: Denison Mines holds a 30% interest in this JV; Cosa Resources Corp. operates the project (70%).
Material Impact
  • The news is positive but classified as Routine because it follows up on the March 24, 2026 announcement which already reported the initial high-grade intercept from Hole MLN26-013.
  • Confirming multiple holes intersected radioactivity reduces the risk of a single-hole anomaly, supporting the geological model for the Cyclone trend.
  • However, without assay grades (U3O8 %), the economic significance remains unproven. The market likely priced in exploration upside following the March release and the broader sector momentum.
  • For Denison Mines (the primary entity with provided stock data), this represents a 30% interest asset update. It does not materially alter the valuation of the flagship Phoenix project, which is the main value driver.
  • The news reinforces the strategic partnership between Denison and Cosa but does not constitute new capital or production guidance for Denison itself.
DML · Price
Company Overview
  • Company: Denison Mines Corp. is a uranium mining and exploration company focused on the Athabasca Basin, Saskatchewan.
  • Flagship Project: Phoenix In-Situ Recovery (ISR) Uranium Mine at Wheeler River.
    • Status: Final Investment Decision (FID) made February 2026; construction started March 2026.
    • Timeline: First production targeted mid-2028.
    • Economics: Post-tax NPV $1.57 billion CAD (at base case uranium prices); IRR ~73%.
  • Other Assets: McClean Lake JV (production resumed July 2025), Midwest JV (PEA released August 2025), and exploration JVs with Cosa Resources (Murphy Lake North, Darby).
Read the original news release →

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