Ann: OZ Minerals satisfies 51 percent earn in - West Musgrave, page-10

Which is exactly what its for. You drill the resource to turn it from Indicated & Inferred into Proven & Measured. The results from the drilling are used for PFS with a lower (but improved) level of certainty then DFS with an eventually Bankable level of certainty.
However, we certainly don't want to be dipping into our pockets to fund any residual drilling required to get it to DFS standard. There may even be tension between what OZL thinks is DFS standard and CZI thinks is DFS standard. (In fact we got caught out a little a the end of the FFS as to what the ASX regarded as suitably certain to be included mineable tonnes for the FFS).
These are all fine points that will be teased out with the help of our resident Expert geologist Mr. Salpetie.
All being well CZI & OZL will be gung-ho to get financing.