Utilize the input text as a context reference, choose the right relationship between 'El Abra mine' and 'Freeport-McMoRan' from the options.
Options: employer, operator, founded by, product/material produced

SANTIAGO Aug 31 A Chilean union that represents copper mine workers on Monday rejected a move to drastically cut staff at the El Abra mine owned by Freeport-McMoRan and was considering action after 700 workers had their jobs terminated at the weekend.
operator