Global copper supply disruptions increased in the second quarter of 2013 as a result of the Bingham Canyon slide and the closure at Freemont's Grasberg.

But despite these and other disruptions, 2013 supply growth remains positive and is expected to remain so throughout 2013, with surplus widening in 2014.

A study by Macquarie Research expects global copper mine supply growth in 2014 to approach 7% YoY, the highest rate of supply growth in a decade.

The 10 fastest growing copper projects alone are expected to deliver up to 1Mt of additional copper in 2014. Half of these are greenfield.