NexGen Energy Ltd. reported assay results for the final 28 holes from summer 2018 drill program on 100% owned, Rook I property, in the Athabasca Basin, Saskatchewan. New high grade mineralization was discovered and confirmed for the first time, northwest of the A1 shear with a geotechnical test hole and will be followed up during the winter 2018 drill program. Additionally, step-out drilling outside of the area of the current Mineral Resource estimate has resulted in the most heavily mineralized hole in the A3 shear to date. Infill drilling has continued to confirm the strong continuity of mineralization at the Arrow deposit. The A3 high-grade domains have now been largely drilled at a spacing of 25 m x 25 m. Key potential expansion areas have been identified surrounding these domains and will be followed-up during the winter 2018 drilling program.