Shockwaves from Washington’s decision to impose a 50 per cent tariff on copper imports are still rippling across the Pacific, and China, the world’s largest consumer of the metal, is feeling the effects.Copper futures traded in the US rallied on the tariff threat, expanding a price gap with the London and China markets, where prices fell.The most active copper futures contracts traded on the Shanghai Futures Exchange fell by 1.36 per cent on Wednesday following US President Donald Trump’s...