Shares of US copper miners rise on Trump tariff threats

** Shares of copper miners in North America rise after President Donald Trump moved closer to imposing tariffs on imports of the red metal

** Most active May copper futures on the U.S. Comex HGc4 exchange jumped 3.8% to $4.70 a pound, having touched a 8-1/2 month peak on February 13

** Comex contract outperformed three-month copper on the London Metal Exchange CMCU3, which was up 1.2% at $9,511 a metric ton by 1030 GMT

** Copper miners Southern Copper SCCO.N and Freeport-McMoRan FCX.N up 4.7% and 2.5%, respectively

** U.S.-listed shares of Canadian miners Hudbay Minerals HBM.TO up 4.1% and Teck Resources TECKb.TO rise 2.8%