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.
Refer to the input text as context and select the correct relationship between 'El Abra mine' and 'copper' from the available options.
Options: operator, product/material produced, founded by, chief executive officer