Take context from the input text and decide on the accurate relationship between 'Chuquicamata' and 'Codelco' from the options provided.
Options: location of formation, publisher, operator, parent organization

SANTIAGO, July 28 World no.1 copper miner Codelco halted operations Tuesday at its key Chuquicamata mine as a week-long contract workers' strike intensified, chief executive Nelson Pizarro said.
operator