BS Reporter / Mumbai July 04, 2008, 0:16 IST The global copper mine production will grow at an average rate of 5.2 per cent per annum to reach 23 million tonne (MT) in 2012, says an inter-governmental forum. South American and African countries will account for more than 42 per cent per annum of the mine capacity increase in next four years, according to data released by Portugal-based International Copper Study Group (ICSG). Of the total increase, copper in concentrate capacity is expected to increase by 2.7 MT (3.5 per cent per annum) and solvent extraction