What is the relationship between 'Antofagasta Plc' and 'ANTOFAGASTA' in the context of the input sentence.
Options: director/manager, location of formation, chief executive officer, distribution format

* ANTOFAGASTA : Barrick Gold Corp agreed on Thursday to sell 50 percent of its Zaldivar copper mine in Chile to copper miner Antofagasta Plc for $1 billion in cash, and both parties stressed that this was just the start of more cooperation.
location of formation