Reading between the lines I'd say that the geological model (the wireframe shapes) has changed with the additional information from infill drilling IMO. That means different geometry and volumes (i.e. tonnage) and different grade distribution (ounces). Given that they're using Leap(of faith)frog's implicit modelling, i.e. an algorithm instead of a geologist to build the geological model, infill drilling can bring about drastic changes. Infill drilling reveals more geological complexities with more information and the assumed grade continuity between drillholes in the previous model can disappear, so the tonnage disappears with it. Happens all the time.
https://www.linkedin.com/pulse/implicit-modelling-disasters-making-part-1-ron-reid/
https://www.linkedin.com/pulse/implicit-modelling-disasters-making-part-2-ron-reid/
Ann: Carlow Castle Update and Proposed Capital Raise, page-72
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