IRONORE/ Rio Tinto RIO.AX, BHP Group BHP.AX and Fortescue Metals FMG.AX slumped between 1.7% and 2.3%. By Upasana Singh Sept 16 (Reuters) - Australian shares closed on Friday at their lowest level in more than a week, with miners leading the losses amid tepid iron ore prices, while risk appetite took a hit after the central bank flagged more interest rate hikes to tame inflation. O/R Meanwhile, a raft of U.S. economic data further dented sentiment as it failed to alter the expected course of aggressive tightening by the Federal Reserve.