** Shares of copper miners listed on the Australian bourse gain as copper prices hit a three-week high amid easing trade tensions between the U.S. and China MET/L
** ASX-listed shares of Capstone Copper CSC.AX CS.TO gain as much as 8.6% to hit A$7.620, their highest levels since April 3
** Copper miner Sandfire Resources SFR.AX climbs as much as 2.1% to reach A$10.095, its highest level since April 10
** CSC and SFR ahead of the local mining .AXMM index, which is up 1.3%
(Reporting by Nichiket Sunil in Bengaluru)
((nichiket.sunil@thomsonreuters.com))