There's no mandatory requirement to update. I think the issue relates to schedule. If you drill then you would like value for the data. If it's not incorporated into a revised RE then you can't claim value for a larger resource. That would add time to update the geomodel( probably months). The inferred resource within the pit shell could be upgraded to indicated or measured, which can then be upgraded to proven or probable reserve. But that requires an update to the feasibility study where the resource must be demonstrated to be economically mineable. While I've only been following this story for a month, I gather from a number of comments that adding another 6 months to the release of the feasibility study would be "expletive deleted" unacceptable.