News: GCY Gascoyne Resources Says Co To Undertake Share Purchase Plan To Raise Up To $5 Million, page-33

Critically they need to be open with grade reconciliation through their mill.
They do not have huge margins with the grades they quote in their reserves - if what they think is 1.24 g/t dirt ends up reconciling as 1.1g dirt then it makes a huge difference to AISC.
They quoted "pre-production" mining tonnes / grade of 700kt @ 1.04 g/t in their reserve statement. To date (end of July) they say they have milled 436kt at 0.71 g/t.
Early days and reserves are always a work in progress but they need that reconciliation to go positive.