Coal extraction is a lucrative industry in Colombia for the transnational corporations operating in the country. One of the most aggressive projects against local communities today is the Cerrejon coal mine in la Guajira, which has been a site for large-scale coal extraction since 1970. In 1976 the Colombian government signed a contract with Intercor (a subsidiary of Exxon) to explore, exploit and commercialize the Northern Zone. Under this agreement, both the exploitation and commercialization of coal would have a duration of 23 years, from which both the mine and the railroad, the port, the buildings, other properties, contracts and fixed assets that are necessary for the development of the business would return to Carbocol, a state-owned enterprise.