GDN is a good broad bet because of the use of its technology in...

GDN is a good broad bet because of the use of its technology in many areas;at worst something will rub off on it because it will be nearby to any discoveries. Gravity surveys are the way to go because all the easy discoveries have been made. The difficult ones have to be found and will be found,but at depth and expense.The expense means that good surveys are essential to cut exploration costs. The only downside is the deal that BHP cuts,but as they own the technology,thats life.