The next Disallowed??, page-171

Looks to me like that is what will happen. If they don't have a provisional mine schedule off the back of it for the current grade they expect they shouldn't be in mining and would heavily suggest they know exactly what they'll be moving into production-wise once they get the proof.

I don't think the grades are in doubt - just proof that what they've drilled through has a much higher grade (in accordance with historical). Face sampling will have shown them what to expect, hence mining a good bit.