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.
product_or_material_produced: Codelco, copper; operator: Chuquicamata, Codelco; product_or_material_produced: Chuquicamata, copper