WMC took three holes to discover Olympic Dam, the rest is...

WMC took three holes to discover Olympic Dam, the rest is history with over 10b tonnes of ore at 0.8% copper. Even OD contains a barren core, the mineralisation occurs in a Breccia which is a fractured iron stone (hematite/magnetite), this creates an issue for explorers as chasing these bodies can create a hit and miss approach until mineralisation is found and a geological model is determined as not all of the target may be mineralised. The size of these deposits creates a tantalising target and hence worthy to chase after.