This excerpt taken from the NGD 6-K filed May 7, 2007.
Table 19-18: Summary Results from PC-BC Modelling
188.8.131.52 Modeling Using Cave-Sim
As Cave-Sim does not schedule an optimum extraction rate from each draw point, a schedule developed using PC-BC was therefore used to control the rate of extraction, except that in the Expected and Best Credible cases, extraction from each draw point was allowed to continued until 90% of the scheduled tonnage had been drawn. Extraction then continue only as long as the drawpoint grade (NSR Value) remained above the shut-off value. In the Worst Credible case, an 80% cap was applied before grade control took over.
Eight different particle flow domains were assigned for numerical analysis. These domains were selected on the basis of their particle flow parameters, principally the D50 size fraction. Within each domain, three sets of primary (P) and secondary (S) fragmentation estimates were applied for each case. The fragmentation estimates used are shown in Table 19-19 and Table 19-20.