Grade control stockpiles are needed to provide an appropriate blend of feed for the mill. The criteria used to classify ore is not just estimated metal content. Clay content, ore hardness, even moisture content may be among the criteria used. The different ore piles are there to be blended to optimise mill operations.
It is not appropriate to disclose estimates of the grades in these stockpiles because the level of confidence is too low. Grade estimates are appropriate for mill feed selection but that is as far as it goes
Grade control stockpiles are needed to provide an appropriate...
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