Copper miners gain as red metal prices inch up on weak US dollar

U.S.-listed shares of copper miners gain premarket, tracking higher red metal prices

Benchmark three-month copper on the London Metal Exchange CMCU3 gained 1.6% to $9,867 a metric ton, its strongest since March 28

Copper prices rose, helped by a weak U.S. dollar, concerns about supply and buying by speculators after key technical levels were broken

Global mining giants Rio Tinto RIO.N and BHP Group BHP.N rise ~2% and 2.2%, respectively

Copper miners Southern Copper SCCO.N up 1.8% and Freeport-McMoRan FCX.N gain 2.9%

Canadian miner Hudbay Minerals HBM.N rise 1.6%