Aluminum Corp. of China, or Chinalco, remains committed to its planned US$19.5 billion investment in Rio Tinto PLC (RTP), a senior official from the Chinese firm said Wednesday.

Wang Wenfu, president of Chinalco Overseas Holding Ltd., Chinalco's acquisition arm, told Dow Jones Newswires he had noted that Rio issued a statement Wednesday reaffirming the Anglo-Australian miner's support for the deal.

"We are committed to the same course, and we have not considered any alternatives," Wang said.

Rio's share price fell Tuesday on reports it is planning a rights issue of about US$8 billion if its deal with Chinalco falls through.

-By Chuin-Wei Yap, Dow Jones Newswires; 8610 6588 5848; chuin-wei.yap@dowjones.com