Aluminum Corp. Of China, or Chinalco, will soon sign a $19.5 billion deal with Rio Tinto Ltd. (RTP) to raise its stake in the miner, Chinalco Deputy General Manager Lu Youqing told Dow Jones Newswires Thursday.

"We will hold a joint press briefing with Rio later today in Australia," he said.

Lu declined to provide further details on the deal.

Chinalco is the parent of Hong Kong-listed Aluminum Corp. Of China Ltd. (2600.HK).

-Chen Juan contributed to this story, Dow Jones Newswires; 86-21-6120-1200; juan.chen@dowjones.com