1502 GMT [Dow Jones] Rio Tinto's (RTP) arbitration process with Ivanhoe Mines Ltd (IVN.T) is unlikely to have any material effect on the development of the Mongolian Oyu Tolgoi copper project, says a London-based analyst. He says Rio Tinto is referring Ivanhoe's shareholder rights plan to arbitration because it believes the plan restricts Rio's ability to increase its stake in Ivanhoe, the analyst says. He notes that Rio is trying to keep its options open in the event it decides to increase its stake in the company beyond the 46.6% cap. Rio currently owns 29.6% in Ivanhoe. Rio Tinto -2.2% at 3102p. ([email protected]) Contact us in London. +44-20-7842-9464 [email protected] (END) Dow Jones Newswires July 12, 2010 11:02 ET (15:02 GMT)