Denison Mines Corp is a Canadian uranium exploration and development company. The company's primary focus is on the exploration and development of uranium properties in Canada's Athabasca Basin. Denison Mines Corp also has interests in exploration projects in Zambia and Mongolia. The company's flagship project is the Wheeler River Uranium Project, which is located in the Athabasca Basin in northern Saskatchewan. The project is a joint venture between Denison Mines Corp and Cameco Corp, with Denison Mines Corp holding a 90% interest in the project. The company was founded in 1997 and is headquartered in Toronto, Canada.