Australian miners hit near 3-month low on falling copper, iron prices

** Australian mining stocks .AXMM slide as much as 3.6%, logging their lowest level since July 21

** Sub-index sees biggest intraday pct fall since September 11

** AXMM on course for third consecutive session of declines, if current trend holds

** Miners fall on the back of falling copper and iron ore prices MET/L IRONORE/

** Mining giants BHP Group BHP.AX and Rio Tinto RIO.AX down 3.8% and 4.2%, respectively

** Sub-index up 5.9% YTD