Denison Mines Corp is engaged in uranium mining-related activities, including the acquisition, exploration, development, and mining of uranium-bearing properties, as well as the processing, sale, and investment in uranium. The company's key properties include Wheeler River, Waterbury Lake, McClean Lake, Midwest, and others. It operates through two segments: the Mining segment and the Corporate and Other segment. The majority of the company's revenue is generated from the Mining segment, which includes activities related to exploration, evaluation, and development, mining, milling (including toll milling), and the sale of mineral concentrates.