NEW YORK, Jan 4 (Reuters) - US copper futures ended the first trading session of the year sharply higher on Monday, as a combination of dollar weakness, strong manufacturing data, and supply threats in Chile drove prices up to a new 16-month peak. ...http://in.reuters.com/article/rbssIndustryMaterialsUtilitiesNews/idINN0424547820SANTIAGO, Jan 4 (Reuters) - Workers at Chile's Chuquicamata, the world's second biggest copper complex, began a strike over pay early on Monday, hitting output from glob...