The Rook 1 project, which is a proposed uranium mining and milling operation that will be 100% owned and operated by TSX-listed uranium mine development company NexGen Energy, in the south-western Athabasca Uranium Basin region in northern Saskatchewan, has been given permission to begin environmental assessments, NexGen said in a statement on Monday. The assessment will be conducted through a coordinated process between the Saskatchewan Ministry of Environment and the Canadian Nuclear Safety Commission (CNSC), it said.