BEIJING -(Dow Jones)- Aluminum Corp. of China, or Chinalco, is unlikely to get involved in Rio Tinto PLC's massive copper-gold Oyu Tolgoi mining project in Mongolia as a direct partner, since it may trigger political resistance from the Mongolian government, a top banker with Mongolia's largest lender said Thursday.

"That would be a real stick in the eye for the Mongolian government," said J. Peter Morrow, chief executive officer of Khan Bank, which has done extensive work in helping to develop Mongolia's mining sector.