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NexGen Energy Ltd. reported high-grade chemical assay results from its ongoing diamond drilling campaign targeting deep basement extensions of the Arrow uranium deposit within the Rook I project area in Saskatchewan. Deep directional diamond drill holes testing the southern and down-plunge extensions of the primary mineralized shear zones encountered dense uraninite and pitchblende mineralization hosted within silicified pelitic gneisses.
Drill hole AR-26-248 intersected continuous mineralization grading 7.85 percent U3O8 over a core length of 24.5 meters, including a higher-grade sub-interval returning 22.40 percent U3O8 over 6.0 meters. Downhole gamma radiometrics and directional gyro surveys confirmed that the newly discovered mineralized shoot remains completely open down-dip and along strike toward the southwest.
Geological core logging identifies intense chlorite and hematite alteration halos flanking competent graphitic shear zones, validating predictive structural models developed by NexGen s exploration team. The preservation of intense hydrothermal mineral assemblages within impermeable crystalline basement rocks reinforces the high preservation potential of exceptional uranium grades without structural displacement.
All drill core recovered from the campaign is systematically scanned with calibrated scintillometers, logged in secure on-site core facilities, and dispatched under chain-of-custody protocols to SRC Geoanalytical Laboratories in Saskatoon. Quality assurance and quality control procedures include the regular insertion of certified uranium reference standards, field duplicates, and blank samples.
NexGen stated that these exceptional drill intercepts highlight substantial resource growth potential beyond the mineral reserves defined in the Rook I Feasibility Study. The company continues to operate multiple diamond drill rigs testing priority basement electromagnetic conductors identified across the broader SW2 and SW3 corridors.
NexGen Energy noted that directional drilling techniques allow multiple deep intersections to be completed from single surface drill pads, substantially mitigating environmental surface footprints across northern Saskatchewan forests. Ongoing exploration programs will test additional structural extensions during the upcoming winter exploration season.
Detailed structural analysis demonstrates strong geologic continuity between basement shear corridors, validating long-term resource potential.