About 2,000 people rallied in Uruguay’s capital, demanding the government to stop London-based Zamin Ferrous's $3 billion Valentines iron ore mine and other major projects.
It is the third such attack on Cerrejon infrastructure — a joint venture between Anglo American, BHP Billiton and Xstrata — this year and follows seven incidents in 2012.
After seven years of almost no growth, copper supply expansion is set to average over 4% through 2016, but the market surplus is likely to remain marginal.