Hey tlc, the estimates of what is going to the stockpiles will...

Hey tlc,

the estimates of what is going to the stockpiles will be based largely on blasthole drilling assays, with a production block model being developed internally based on that data. This has certainly been the case in all of the mines I have worked on. There are always issues reconciling the resource block model with the production block model when you get down to a block-by-block reconciliation as the resource model is necessarily based on a much coarser drill spacing than the blast-hole drilling (although this will not neccessarily be the case with parts of ROcklands South, Wilgar and Fairfield, which CDU appears to be attempting to mine with a drill rig).

Blasthole assays will (should?) be the main dataset used to determine what is being mined and it going to the stockpiles. There will also be a sampling regimen post crushing and blending as well to ensure a consistent DSO product.