Denison Mines Corp. is a uranium exploration and development company. The Company is engaged in the acquisition, exploration and development of uranium properties, extraction, processing and selling of uranium. The Company operates in three segments: the Mining segment, the Environmental Services segment, and the Corporate and Other segment. The Mining segment includes activities related to exploration, evaluation and development, mining, milling and the sale of mineral concentrates. The Environmental Services segment includes the operations of the Company's environmental services business, Denison Environmental Services (DES). The Corporate and Other segment includes its provision of general administrative and management services to Uranium Participation Corporation (UPC). The Company holds interests in exploration and evaluation projects located in Canada, Mali, Namibia and Zambia. DES provides post-closure mine and maintenance services to various industry and government clients.