NexGen Energy Ltd., an exploration and development stage company, engages in the acquisition, exploration, evaluation, and development of uranium properties in Canada. It holds a 100% interest in the Rook I project that consists of 32 contiguous mineral claims totaling an area of approximately 35,065 hectares located in the southwestern Athabasca Basin of Saskatchewan. NexGen Energy Ltd. was founded in 2011 and is headquartered in Vancouver, Canada.