http://www.mongoliaonline.com/Mining/rio-tinto-beefs-up-position-in-canadas-ivanhoe/ MELBOURNE (Reuters) - Global miner Rio Tinto (RIO.L) will increase its stake in Canada's Ivanhoe Mines (IVN.TO) by 2.7 percent to 22.4 percent for $233 million, in a move tied to plans to jointly develop the giant Oyu Tolgoi copper mine in Mongolia. Sun, 28 Feb 2010 13:58:13 EST en