 VANCOUVER, BC, July 26, 2021 PRNewswire - NexGen Energy Ltd. NexGen or the Company TSX: NXE NYSE: NXE ASX: NXG is pleased to announce commencement of field programs focused on detailed geotechnical site confirmation studies on the Project and regional exploration drilling at the 100 owned, Rook I property the Property, in the Athabasca Basin, Saskatchewan. 