Xstrata. Currently, the Cerrejón South Zone is under exploration. Description Cerrejón was at one point the tenth largest coal mine in the world and the biggest in Latin America. Production started in 1985, when the mine was operated by Carbocol, a Colombian state company and Intercor, a subsidiary of ExxonMobil. The proven reserves in 2009 were and the probable reserves . The coal is low-ash, low-sulphur bituminous coal, mined from the Paleocene Cerrejón Formation in the northeastern part (Cerrejón Sub-basin) of the Cesar-Ranchería Basin. The coal seams reach a thickness of . The total production in 2016 was . Operator As of 2017 Cerrejón was owned in equal parts by subsidiaries of three international mining companies BHP, Anglo American and Glencore. These 3 companies sell the coal through their business named CMC, headquartered in Dublin. The mine produces over of thermal coal a year and has estimated reserves of over . From 1985 to 2011, it produced 508.8 million tonnes of coal and generated US$2,006 million in royalties. In 2011 alone, sales generated US$336.60 million for the country as a whole and the region of La Guajira. By the end of 2011, it had reached a historical production figure of 32.03 million tonnes to the following markets: Europe (58%), the Mediterranean and Asia (21%), Central and South America (12%), and North America (9%). These external sales represent 40% of Colombia's coal sales and 4.6% of global coal sales. Integrated operation The open-pit coal mine has maintenance workshops of over . Workforce Carbones del Cerrejón's directly employed 5,373 workers (62% from La Guajira, 28% from other parts of the Caribbean coast, and 10% from the rest of the country). In addition, a further 4,497 workers are employed indirectly through contractor firms for the operation. Mushaisa Residential Unit offers complete infrastructure for housing, commercial shops, and services for 2,200 residents, 297 houses, 430 apartments, and a hotel for over 200 people. Albania School is a bilingual school with a very high ICFES ranking at 23 out of 12,273 educational institutions in the country. Mining fleet Carbones del Cerrejón has a mining fleet comprising 493 pieces of equipment: 258 trucks with a load capacity of 190, 240, and 320 tonnes, 50 hydraulic shovels, and 185 pieces of auxiliary equipment. A truck can haul a load equivalent to approximately 10 tractor trailers. In Colombia, a tractor trailer hauls 30 to 35 tonnes.A P&H 2800XPC