Utilize the input text as a context reference, choose the right relationship between El Abra mine and copper from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

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.

Answer: product_or_material_produced