NDrefineryDICKINSON, N.D. (AP) – The owners of a new oil refinery in western North Dakota plan to operate it at only 75 percent capacity due to continued losses tied to the slumping oil industry. MDU Resources Group Inc. says the Dakota Prairie Refinery at Dickinson lost $7.2 million in the first quarter, due in part to low demand for diesel fuel. MDU Resources and Calumet Specialty Products Partners spent $430 million on the refinery.