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When up-blocking a resource model to a mining model it's fairly simple to weight average the qualities and RD's, but what happens to the rock types and confidence indexes (measured, indicated, inferred)... e.g. when one block is banded ironstone, and the other block is shale, what do you call the weighted average of this new block? Same goes for when you have a measured block and add it to an indicated block, you can downgrade according to the SAMREC code so that both blocks are indicated, but what if you have an indicated block and an inferred block, then you can't just downgrade anymore... I normally just keep the original tonnages from the resource model in the up-blocked model, but I would like to hear from industry if there is a "cleverer" way of up-blocking character fields...

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