Emerald Oil Inc. (NYSE MKT: EOX) increased the borrowing base under its revolving credit facility, the company said Dec. 1.

The bank syndicate increased it to $250 million from $200 million in its semiannual redetermination. The next redetermination is scheduled to occur April 1, 2015, the company said.

Denver-based Emerald Oil Inc. operates in the U.S. portion of the Williston Basin.