Freeport Indonesia workers fear for safety after Grasberg deaths

"While a large number of countries around the world continue to talk about securing raw material supply, China is actually doing something about it."

CFIUS said on Monday that allowing Nippon Steel to take over US Steel could result in lower domestic steel production.

Rival Young Poong and private equity firm MBK Partners have been trying to take over the world's biggest zinc refiner.

The group said it will consider the base metals business demerger at a later stage.