Thanks to Andrea Fiss for this link:

At Work: Historical Images of Labour in Saskatchewan

The caption for this image reads:

Construction crew for the Uranium City road. The crew appears to be made up entirely of First Nations men, employed to clear a route through the forest. Date: 1951

The collection includes 5 photos under the search ‘uranium’ (but not, curiously, ‘uranium city’), the road crew, miners in a railroad cart in the mine and coming off their shift, a geologist somewhere near Lake Athbasca, and a school bus driver. The collection is put together by the University of Saskatchewan, and is drawn from labour all over the province.