During the late 1930s Port Radium was one of the few sources of radium.[1][2][3]
During World War II, the mine was the main source for the uranium used by the atomic bomb program.
Other than the air charter, goods and personnel could only be conveyed to and from the northernmost terminus of the North American railway grid, at Waterways, Alberta, was by water, a 1,450 miles (2,330 km) trip that took weeks. The rivers are frozen almost eight months of the year, closing down the initial leg of the trip.
^ abc"Wreck of the Eldorado Radium Silver Express". Western Canada Aviation Museum. Archived from the original on 2011-08-21. The waterborne segment of the route (1450 miles) not only had limits to its capacity, but for the bulk of the year, the lakes and rivers were frozen. Eldorado's owners sought an all-season transportation mode to bridge the gap between mine and railhead.