Big times ahead, page-22

It will work but the problem with gold recovery from Sulphide ore is how may a mill get the maximum recovery of gold from a sulphide ore.  The biggest issue is that the extraction  process has in various degrees very high operating costs.This means that they are economic only on a high grade deposit. The majority of refractory gold deposits are of lower grade and whilst many could contain enough reserves to sustain a high cost extraction process,invariably extensive drilling to determine this does not justify the risk/reward scenario.