Cerrejon is made up of four zones: the North Zone, the Central Zone, the Patilla area and the South Zone.
In December 1976, an Association Contract was signed between Carbocol S.A., a state owned coal company, and Intercor, an ExxonMobil affiliate, for the development of Cerrejón North Zone. In January 1999, an agreement with the Government of Colombia extended this phase an additional 25 years more, until 2034.
In November 2000, the Colombian Government sold Carbocol S.A.’s (50%) participation in Cerrejón North Zone Association Contract, to a consortium made up of subsidiary companies of BHP Billiton plc, Anglo American plc and Glencore International AG. In February of 2002, the consortium acquired the remaing 50% from Intercor and merged Intercor with Carbones del Cerrejón S.A to create Carbones del Cerrejón LLC, Cerrejón.