The oil field, and the Heglig field further north, were discovered by Chevron Corporation in 1982, and was to become one of the most productive fields in Sudan. Chevron spent almost $880 million in exploration, but suspended operations soon after the Second Sudanese Civil War (1983-2005) began. The trigger was the killing in 1984 of three Chevron workers by Anyanya II rebels. Chevron demanded a special oilfield protection force in addition to the army. Dissatisfied with security, by 1988 Chevron had closed its operations in Unity province.
- "Fact Sheet Two: A History of Oil in the Sudan" (PDF). Understanding Sudan. University of California, Berkeley. Retrieved 2011-09-14.