Five small briquetting plants were added to the operation in 1937 to produce a marketable product from powdery, fine coal. On 31 October 1941, a large underground explosion in the No. 3 Mine killed 29 miners. Mining resumed six weeks later, and during 1942 the Nordegg mine was one of the top coal-producing mines in Alberta. The town reached a maximum population of about 2,500 in the early 1940s, and a surface mining operation was added in 1946. In 1950, a fire destroyed the tipple and five wooden briquetting plants. A new, more modern briquetting plant was then built of metal. It began operation at the end of 1951 but a large government debt had been incurred for its construction. Coal markets declined, primarily due to the decreasing use of steam coal as railroads replaced steam locomotives with diesel, and Brazeau Collieries closed permanently in 1955. Most people left after the mine closed, although a few families stayed on. The coal reserves at Nordegg had not been exhausted, but mining never resumed. Total production had been about 9.6 million tonnes of low- to medium-volatile bituminous coal. Climate Nordegg has a subarctic climate (Dfc) which can be considered a subalpine climate due to its altitude with locations on the same latitude having warmer climates. Summers are mild, with a few warm days sprinkled in here and there, while winters are cold and snowy. Demographics Nordegg recorded a population of 53 in the 1986 Census of Population conducted by Statistics Canada. Attractions Most of the surface coal handling, processing and support facilities at Nordegg are still standing. They were declared a Provincial Historic Resource in 1992, and a National Historic Site of Canada in 2002. There are guided tours of the surface facilities during the summer months. Tours of the underground mine workings are not possible because most of the tunnels have collapsed. A stretch of about into the entrances of the No. 2 and No. 3 Mines has been restored and can be entered, but beyond that the entries are blocked. A land exchange with the Province of Alberta has stimulated redevelopment of Nordegg. A mountain acreage community, the North Nordegg Subdivision, is developing north of Highway 11, adjacent to the Shunda Creek Hostel. Clearwater County has released plans for the redevelopment of downtown Nordegg, much of it on the footprint of the original townsite. See also List of communities in