She says her other kids -- ages 15, 9 and 7 -- know the "safety drill" by heart: When Michael starts to go off, they run into the car and lock the doors.
As players like Chesapeake Energy have been churning through expensive capital to drill up newly acquired acreage before their leases run out, Chevron has the option to just bide its time.
Andre Sougarret, mines manager for state-run copper company Codelco and on-site rescue coordinator, said that operation was stopped Tuesday while thedrill head was changed.