29 April 2015. An empty asphalt tank caught fire at the Calumet oil refinery in Superior on Tuesday afternoon, prompting the evacuation of nonessential personnel at the facility and creating a dark plume of smoke visible for miles.

DULUTH NEWS TRIBUNE

http://www.duluthnewstribune.com/news/superior

At industryabout.com: Calumet - Superior Oil Refinery

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