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.
What is the relationship between 'Chuquicamata' and 'Codelco' in the context of the input sentence.
Options: parent organization, publisher, operator, location of formation