DICKINSON, N.D. (AP) — Bismarck-based MDU Resources Group Inc. and Indianapolis-based Calumet Specialty Products Partners have broken ground for a diesel refinery in North Dakota.

The $300 million Dakota Prairie Refinery on 318 acres west of Dickinson will process up to 20,000 barrels of oil daily.

Officials including North Dakota's governor and members of the state's congressional delegation broke ground for the project Tuesday. Construction is expected to take about 20 months. The plant eventually will employ about 100 people, with hiring expected to begin this year.

North Dakota has only one oil refinery, the Tesoro Corp. facility in Mandan. Several other projects have been proposed in the state in recent years, including a Dakota Oil Processing facility proposed near Trenton in northwestern North Dakota that would be similar to the refinery near Dickinson.