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Tesoro Corp. buys struggling oil refinery in North Dakota

BISMARCK, N.D. (AP) — Texas-based Tesoro Corp. has bought an oil refinery in southwestern North Dakota that has struggled to turn a profit due to a dramatic fall in demand and low diesel prices. North Dakota-based MDU Resources Group Inc. and Indianapolis-based Calumet Specialty Products Partners LP spent $430 million on the Dakota Prairie Refinery in Dickinson. It has not ...

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