NexGen Energy Ltd. said June 7 that recent drilling further expanded the Arrow deposit on its Rook I property in Saskatchewan's Athabasca Basin.

Stepout drilling focused on the Southwest Gap, near Arrow's southwestern margin, expanded mineralization to the southwest, southeast and updip, while drilling focused on the Northeast Gap also expanded mineralization to the northeast.

The company also reported that exploration drilling 300 meters to the southeast of the Arrow deposit identified visible pitchblende mineralization. Pitchblende, also known as uraninite, is a radioactive, uranium-rich mineral.

NexGen noted that the Southwest Gap was not included in its March update to resources, which upgraded 89% of inferred resources to the indicated category.

The company is planning further drilling focused on the Arrow deposit this summer, while an initial preliminary economic assessment is anticipated by early in the third quarter.