• Australian heavyweight miners down over 4%; mining sub-index set for weekly loss of 3.9%

• Copper prices fall after Reuters reported the White House was yet to decide on refined copper tariffs amid concerns over higher prices and manufacturing cost impact [MET/L]

• World's top miner BHP sheds as much as 4.1% to A$60.79, headed for a 2.5% weekly drop

• Rio Tinto sheds 3% to A$169.3; pure-play copper producer Sandfire Resources plunges as much as 8.3%, biggest intra-day pct loss since June 9

• YTD, AXMM up 14.5%

(Reporting by Nichiket Sunil in Bengaluru)