** Shares of Australian miners .AXMM fall as much as 2.2%, hitting their lowest level since May 6
** Sub-index on track for a fifth consecutive session of fall
** Iron ore prices fell overnight as top user China's stricter plan to tame overcapacity in the steel industry dampened demand prospects for feedstocks IRONORE/
** Mining giants BHP Group BHP.AX down 1.6% and Rio Tinto RIO.AX slips 1.6%
** AXMM up nearly 12% this year, including the day's move
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))