Internal records show North Dakota has kept silent on scores of oil spills over the past two years. According to the Associated Press, North Dakota has recorded nearly 300 oil spills since January 2012, but none have been publicly disclosed. It took 11 days before North Dakota just recently announced the Tesoro oil spill that dumped more than 20,000 barrels of crude. North Dakota is the nation’s second largest oil producer, with more than 17,500 miles of pipelines.