The company has expanded the summer program by 5,000m to 30,000m in order to drill test the 210m southwest extension of Arrow to include a maiden NI 43-101 resource estimate in the first half of next year.

NexGen returned visible mineralization and off-scale radioactivity from all six drill holes at the Arrow zone.

Step-out drilling in AR-15-54c1 has intersected high grade mineralization in the A2 shear and widespread high grade mineralization was intersected in the A3 shear during step-out drilling in AR-15-56c1.

The company said the Arrow zone remains open in all directions and its focus for the rest of the summer season will be on defining the extensions of high-grade mineralization in both shear zones.

NexGen Energy vice-president of exploration and development Garrett Ainsworth said: "These latest results from our Arrow zone continue to impress us with four of the six reported drill holes encountering >61,000 cps radioactivity associated with dense accumulations of massive pitchblende.

"Of note, hole AR-15-54c1 drilled at a dip of -62° through the sub-vertical A2 high grade core zone, and returned 42 m of mineralization including 9.4 m of off-scale in the A2 shear demonstrating the high grade cores within Arrow continue to prove up well."

Rook I property also hosts the early-stage Bow discovery which is situated 3.7km northeast into the Athabasca Basin from Arrow.