carajas copper exploration update ..., page-51

Nice try red, this on AVB website "The Rio Verde and Serra Verde properties were previously explored to a reconnaissance level by Barrick and Noranda, these activities were directed at deep sulphide targets leaving surface oxide mineralisation largely untested." and "Avanco?s strategy in the Carajas Province is firmly focussed on the development of shallow, open pit and potentially free digging copper oxide deposits that are amenable to traditional low cost heap/vat leaching with SX-EW copper cathode production. This strategy is now being fast tracked."
So where do you get that this area is uneconomical? Avanco doesn't think so.