For the Monte Carlo approach we then generated independent sets of feed, product and tailings raw assay grade values using the NORM.INV(RAND(),1, RSDG) function in MS® Excel® to apply an experimental measurement error to each assay. It is assumed that all assays across all three flow streams have normally distributed errors with the same underlying relative standard deviation RSDG (i.e. VF,i 0.5 /GF,i = VP,i 0.5 /GP,i = VT,i 0.5 /GT,i = RSDG).