** U.S.-listed shares of copper miners slide premarket, tracking prices of the red metal, which was headed towards its worst month since November MTL/

** Benchmark copper CMCU3 on the London Metal Exchange falls 2.2% to $9,231 a metric ton, as data from top metals consumer China showed the country's factory activity contracted at the fastest pace in 16 months in April

** Also adding to pressure was a lack of progress in de-escalation of the U.S.-China trade conflict

** U.S. shares of global mining giants Rio Tinto RIO.N and BHP BHP.N fall 2.5% and 2.3%, respectively

** Freeport-McMoRan FCX.N drops 4.3% and Southern Copper SCCO.N down 3.3%

** Canadian miner Teck Resources TECK.N falls ~3%

(Reporting by Vallari Srivastava in Bengaluru)

((Srivastava.Vallari@thomsonreuters.com;))