Copper miners down on concerns about tariffs hitting US demand

** U.S.-listed shares of copper miners fall premarket, tracking price of the red metal

** Benchmark three-month copper CMCU3 on the London Metal Exchange (LME) down 0.8% at $9,622 a metric ton, down from the three-month peak of $10,020.50 touched on July 2

** Copper prices fell as investors worried that the 50% tariff on the metal due to be imposed on U.S. imports will erode demand, and as speculators unwound positions

** Global mining giants Rio Tinto RIO.N and BHP Group BHP.N each down marginally

** Copper miners Southern Copper SCCO.N and Freeport-McMoRan FCX.N down 1.3% and 2.6%, respectively

** Canadian miners Ero Copper ERO.TO, ERO.N falls marginally, Hudbay Minerals HBM.TO, HBM.N and Teck Resources TECKb.TO, TECK.N each fall 1.3%