Cerrejon, one of Colombia’s biggest coal producers, and its largest workers union on Friday concluded contract negotiations without reaching an agreement, the parties said.
Union members will now vote on whether to strike or to go to arbitration with the company.
"There was no agreement. We will call a vote between a strike and an arbitration," Igor Diaz, president of Sintracarbon, told Reuters in a message. "Right now we are closer to a strike than we are to a solution."
"Negotiations remain ongoing," Cerrejon said in a message, which is owned equally by BHP Group, Anglo American and Glencore.