Denison Mines holds a 30% interest in the Darby project located 10 km west of the Cigar Lake Mine in Saskatchewan’s eastern Athabasca Basin, with Cosa Resources operating and owning the remaining 70%. The joint venture targets multiple prospective conductive trends with historical and new data indicating potential unconformity-type uranium mineralization.

Winter drill hole DB26-39A on the Charlie Trend intersected strongly anomalous sandstone uranium, averaging 5.6 ppm U over 103.5 m (600.0–703.5 m) including 9.5 ppm U over 53.5 m (650.0–703.5 m), plus 0.04% U₃O₈ over 0.5 m (707.8–708.3 m) in basement. These results exceed historical hole DB-09 and confirm a high-priority follow-up corridor with several untested targets.

Hole DB26-41 on the Gamma Trend identified a 150 m wide graphitic basement fault corridor with significant sandstone alteration, uranium enrichment, and 35 m of unconformity relief relative to historical DB-17. Delta Trend hole DB26-42 returned no significant uranium but several kilometres of prospective strike remain untested, with assays for DB26-42 pending.

Cosa plans a summer drilling campaign at Darby following completion of its Murphy Lake North program, aiming to further test Charlie, Gamma and Delta trends. Positive Darby results could enhance Denison’s resource pipeline and support its uranium exploration portfolio ahead of resumption of drilling in June.