IRONORE/ Heavyweights Fortescue Metals Group FMG.AX, BHP group BHP.AX and Rio Tinto RIO.AX gained between 1.5% and 1.9% to the resource-heavy bourse. Jan 11 (Reuters) - Australian shares rose on Wednesday, led by commodity stocks, supported by relief that the U.S. Federal Reserve Chair refrained from commenting on the monetary policy outlook, while investors awaited key inflation data. MKTS/GLOBFEDWATCH The focus is also on Australia's CPI data for November due later in the day, after the annual rate of inflation unexpectedly slowed to 6.9% in October from a multi-year high of 7.3%.