The attack occurred late on Monday in northern La Guajira province where the open-pit coal mine is located.
Cerrejón Mining News
The largest union at Cerrejon has reached an 11th-hour salary and benefits deal with the company, avoiding a strike, the union said on Thursday.
Colombian coal miner, the world's 4th largest exporter, suffering from strikes and sabotage.
FARC rebels target Colombia's largest coal producer.
It is the third such attack on Cerrejon infrastructure — a joint venture between Anglo American, BHP Billiton and Xstrata — this year and follows seven incidents in 2012.
Company offered 5% pay hike; union wants 9%.