BISMARCK, N.D. — North Dakota’s Oil and Gas Division says nearly 24,000 gallons of saltwater and 420 gallons of oil spilled at a saltwater disposal well in Dunn County.

Officials say most of the fluids remained inside diking at the site about 25 miles north of Killdeer. A state inspector has been to the site and will monitor any additional cleanup.

Officials say the spill happened Jan. 30 when automatic shut-off devices failed and caused tanks to overflow. Deep Creek Adventures Co. verbally notified the state of the incident the day it happened and filed a spill report Monday.