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.
Refer to the input text as context and select the correct relationship between 'El Abra mine' and 'copper' from the available options.
Options: distribution format, product/material produced, manufacturer, location of formation