Aluminum Corporation of China Ltd., the nation’s biggest producer of the metal, suspended its shares from trading pending an announcement on an “important discussion.”

Shares of the company that’s known as Chalco are expected to resume trading in Hong Kong and Shanghai on July 30, the Beijing-based company said in a statement. Parent Aluminum Corp. of China, also known as Chinalco, said it will hold a signing ceremony tomorrow in Beijing, without giving details.

Chinalco in March signed a non-binding accord to pay $1.35 billion for a stake in Rio Tinto Group’s Simandou iron ore project in Guinea. The state-owned company is “watching closely” for opportunities to invest in other overseas projects, including Rio’s Oyu Tolgoi copper project in Mongolia, Xiong Weiping, chairman of both Chinalco and Chalco, said March 29.