Shanghai copper higher

The most-traded copper contract on the Shanghai Futures Exchange finished 0.5 percent higher at 54,340 yuan ($8,239) a tonne on Friday. However other ShFE metals were mixed, with only tin and nickel finishing in positive territory, up 0.9 percent and 1.3 percent, respectively. Unionized workers at Chile's Escondida copper mine, the world's largest, started a 24-hour strike on Thursday to protest against recent layoffs.
Workers for the two largest unions at Southern Copper Corp in Peru started an indefinite strike, though the company said operations were unaffected.