Drill Results
Cosa Reports 5.0 metres of Anomalous Radioactivity up to 13,900 CPS Intersected at Murphy Lake North Joint Venture with Denison Mines
Denison’s Phoenix progress gains momentum as uranium JV activity widens in the Athabasca Basin
Executive Summary
- The most recent news release in the provided data is from Cosa Resources Corp. dated 2026-03-24 reporting a first winter 2026 drill hole at the Murphy Lake North project (MLN) that intersected 5.0 metres of continuously anomalous radioactivity, peaking at 13,900 cps, within a 1,200-metre gap between fences in the Murphy Lake North–Cyclone trend. The MLN is a 70% Cosa / 30% Denison Mines joint venture. Assays are pending, and the mineralization is described as open in all directions with drill results 600 metres away along strike to the east and west. Follow-up drilling is planned for the remainder of the winter program.
- Context: This update sits in a broader Denison-centric narrative around Phoenix ISR developments and regional JV activity. Prior to this, Denison and partners had multiple material progress milestones in early 2026:
- 2026-02-19: CNSC final regulatory approval for Phoenix ISR (Environmental Assessment and Licence to Prepare Site & Construct) with construction readiness proceeding, keeping first production targeted for mid-2028.
- 2026-02-17 and 2026-02-24: Construction management contracts (Wood Canada) announced for Phoenix, signaling ramp-up toward actual site work pending regulatory approvals.
- 2026-02-24: Denison reiterates readiness to proceed with Final Investment Decision (FID) and construction after approvals, with a post-FID capital cost update indicating a CAD 600 million estimate (vs. CAD 419 million in the 2023 FS), reflecting inflation and project refinements.
- 2025-12 to 2026-01: Denison expanded JV footprint around Wheeler River with the Skyharbour deals and Nuhénéné/Indigenous benefit agreements, highlighting a broader strategic push in the region alongside continued project execution (Phoenix ISR and Gryphon/Darby/Midwest exploration).
- Synthesis: The March 24 Cosa drill result adds incremental exploration validation in a nearby region of Denison’s Wheeler River assets. It is positive for regional uranium potential and for the JV’s exploration value, but is not a direct material update to Denison’s near-term construction or production plan. It complements the ongoing regulatory, financing, and contract execution activity around Phoenix ISR and related assets.
Material Impact
- Direct materiality to Denison (short term): Low to modest. The MLN drill result is a positive drill intercept from a JV in which Denison has a 30% stake, and it signals potential upside in the Murphy Lake North area. However, the assay data are pending, and the discovery is early-stage without an updated resource estimate or immediate production implications. The key near-term catalysts remain the CNSC and provincial approvals for Phoenix, the Final Investment Decision (FID), and the start of construction (targeted mid-2028 first production for Phoenix). So the immediate stock impact is likely muted, with a placeholder for potential upside if assays and follow-on drilling define a meaningful resource.
- Alignment with prior expectations: The news aligns with Denison’s broader strategy of expanding a regional exploration portfolio around Wheeler River (e.g., Darby, Murphy Lake North, Orion expansions) and with the ongoing push to advance Phoenix ISR through regulatory approvals and construction readiness. It reinforces the notion of a growing, multi-asset pipeline in the Athabasca Basin, which investors have expected given Denison’s stated strategy and recent JV activity.
- Hidden/risks to note:
- Assays are pending; there is no immediate resource estimate or economic study tied to MLN yet.
- The significance of a single shallow 5.0 m interval at 13,900 cps is encouraging but not indicative of a deposit-scale resource.
- JV dynamics: Denison’s share remains 30% in MLN; the ultimate economic impact depends on whether follow-up hits define a viable resource and how it interacts with the overall Wheeler River project economics.
- Broader macro risk remains uranium price and the regulatory timeline for Phoenix and CNSC license/EA approvals.
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Company Overview
- Denison Mines Corp. is a uranium-focused developer/operator with a multi-asset pipeline in the Athabasca Basin, Saskatchewan. Its flagship Wheeler River project centers on the Phoenix In-Situ Recovery (ISR) mine, planned as a large-scale uranium operation leveraging ISR technology. Phoenix ISR has progressed through regulatory processes with provincial EA approvals and CNSC hearings, and Denison has indicated readiness to proceed to construction pending federal approvals and the final FID. Wheeler River also hosts Gryphon, with additional joint-venture projects surrounding the broader region (e.g., Murphy Lake North, Darby, Orion, and Midwest) which are being advanced through expanded JV structures with partners such as Denison’s long-standing collaborator Orano Canada and other regional players.
- Flagship project: Phoenix ISR at Wheeler River (Denison 90% operator; JCU 10%). Targets first production by mid-2028, with a 2-year construction timeline once approvals are secured. The project is designed to be cost-competitive within global ISR operations, and the company has presented updated capital cost and project readiness figures in early 2026.
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Jul 15, 2026 · 08:01