Utilize the input text as a context reference, choose the right relationship between 'El Abra mine' and 'Freeport-McMoRan' from the options.
Options: chairperson, owned by, operator, industry

SANTIAGO Aug 31 (Reuters) - A Chilean union that represents copper mine workers rejected a move by Freeport-McMoRan Inc to drastically cut staff at its El Abra mine and said on Monday it was considering action.
operator