The Ontario Northland Railway (reporting mark ONT) is a Canadian railway operated by the Ontario Northland Transportation Commission, a provincial Crown agency of the government of Ontario. Originally built to develop the Lake Timiskaming and Lake Nipissing areas, the railway soon became a major factor in the economic growth of the province. After decades of difficult construction through the Canadian Shield, workers reached James Bay in 1932. While blasting the route through the shield, geologists discovered deposits of valuable minerals such as gold, silver, copper and nickel. The railway also made it possible to exploit the timber resources of Northern Ontario.