Feb 17 (Reuters) - Rio Tinto (LON:RIO) Ltd RIO.AX :
* ANNOUNCES CHANGES IN ESTIMATES OF ORE RESERVES & MINERAL RESOURCES AT RIO TINTO ALUMINIUM PACIFIC OPERATIONS' WEIPA AND GOVE ASSETS
* RTA PACIFIC OPERATIONS ORE RESERVE ESTIMATE HAS DECREASED BY 305 MT TO 1,224 MT
* NO MATERIAL CHANGE TO ECONOMIC CUT-OFF METHODOLOGY OR PROCESS
* RTA PACIFIC OPERATIONS MINERAL RESOURCES EXCLUSIVE OF ORE RESERVES HAS INCREASED BY 128 M TO 2,077 MT