VANCOUVER, BC, Aug. 21, 2023 /PRNewswire/ – NexGen Energy Ltd. (“NexGen” or the “Company”) (TSX: NXE) (NYSE: NXE) (ASX: NXG) is pleased to announce a major milestone in the advancement of regulatory approvals for the 100% owned Rook I Project (“Rook I” or the “Project”) with the…