Base and precious metal deposits are positively skewed. Consequently, if you reduce the cut-off grade slightly the tons tend to increase much more than you would expect, but the grade also drops. Net effect obviously is more metal.
Dropping the cut-off from 1 to 0.2 g/t would probably result in tonnes increasing by 10-20 fold, but contained metal probably not going up by more than 2-3 times.
pressure mounting, page-18
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