I've really got my thinking hat on...
As of May 2015 the projections were...
Considering the kicking the Brazilian currency has taken since then, and the increase in value of the USD (BRLUSD down about 30% since May http://bigcharts.marketwatch.com/advchart/frames/frames.asp?symb=BRLUSD&insttype=&time=8&freq=1), how much has this offset the fall in copper price (down about 30% since May)
Hmmmmm