Look. it is possible (but unlikely) that they did discover...

Look. it is possible (but unlikely) that they did discover economics were not looking as good as hoped now that they've devised this new ore sorting and milling/floating circuit. In this case, there's no doubt that the new higher grade infill holes will boost economics significantly.

However, there's almost no doubt at all Estelle will become some kind of profitable mine. Worst case they return back to a smaller scale valley fill heap leach operation, similar to Kinross's Fort Knox. There is actually a very high certainty Estell would be quite profitable as such an operation.