** Australian mining stocks .AXMM fall 1.4%, slashing gains from the previous session

** Sub-index tracks global sentiment on mounting worries over the economic impact of U.S. President Donald Trump's multi-front tariff war MKTS/GLOB

** Shares of BHP Group BHP.AX, Rio Tinto RIO.AX and Fortescue FMG.AX fall between 1.6% and 2.5%

** Sub-index down 3.5% this year, as of last close

(Reporting by Sherin Sunny in Bengaluru)

((Sherin.Sunny@thomsonreuters.com;))