1948. Together with a discovery of the Port Radium deposits, the Eldorado company opened the Beaverlodge Mine at Uranium City, Saskatchewan. It entered production in 1953. In the 1960s the nature of sales changed when the United States military ceased purchasing of Canadian uranium ores for the purpose of atomic weapons, and from then on uranium was produced for power plants. During this period the name of the company was changed to Eldorado Nuclear Limited, with Eldorado Aviation Limited operating flights to Port Radium. The Eldorado corporate records are housed in the National Archives of Canada. Port Hope, Ontario Port Hope has the largest volume of historic low-level radioactive wastes in Canada, created by Eldorado Mining and Refining Limited and its private sector predecessors. By 2010 when it was projected that it would cost well over a billion dollars for the soil remediation project of the brownfield, it was the largest such cleanup in Canadian history. The effort is projected to be complete in 2022. According to their 2014 report, the Canadian Parliamentary Budget Officer (PBO) noted that the liability for the Port Hope, Ontario contaminated site was $1 billion, whereas the Big Five other polluters (namely Faro mine, Colomac mine, Giant mine, Cape Dyer-DEW line, Goose Bay Air Base) had a combined liability of $1.8 billion. Former mine sites (partial list) Eldorado Mine (Northwest Territories) Umisk Island References Defunct mining companies of Canada Uranium mining companies of Canada Former Crown corporations of Canada Uranium City, Saskatchewan 1988 mergers and acquisitions Canadian companies established in 1926 Non-renewable resource companies disestablished in 1988 Non-renewable resource companies established in 1926 Canadian companies disestablished in 1988