NexGen Energy Ltd., formerly Clermont Capital Inc., is a Canada-based exploration-stage company. The Company operates in the segment of acquisition, exploration and development of uranium properties. It operates as a mineral exploration and development company with a portfolio of projects that span the Athabasca Basin in Saskatchewan, Canada. The Company's projects include Arrow, Rook I; Bow/Regional, Rook I, and Thorburn Lake. Rook I is its owned flagship property, which hosts the land-based, basement hosted and Arrow deposit consisting of a series of over four sub-vertical mineralized shear zones, A1 to A4, which vary in thicknesses between 4 and 25 meters. The Rook I property also hosts the Bow discovery, which is located approximately 3.7 kilometers northeast into the Athabasca Basin from Arrow. The Company owns the Thorburn Lake property, which is located over seven kilometers east of and on trend with the Cigar Lake mine. It has not generated any revenues.