GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 97 Figure I.10 TSF3 Theis model outputs Theis sensitivity analysis Sensitivity testing is covered by the above analysis, which indicates the solution is sensitive to the range of K (and therefore T) measured at site. A graphed comparison of the results to assess for sensitivity presented above are presented below in Figure I.11. This indicates that: – For ZOI, the solution is sensitive to both S and T. – For inflows, the solution is not very sensitive to changes in adopted S values, but is sensitive to the applied T. The upper end of the results range is expected to be overly conservative, given that only four test locations from a total of 27 locations reported a result greater than 3 x 10-5 m/s (estimated results of 1 x 10-4 m/s), likely due to localised fracturing. The geomean of all results was 5 x 10-7 m/s. Based on the CGM, an applied T of 20 m2/day is expected to be more representative of the bulk permeability of the geology influenced by dewatering and is therefore adopted for the assessment. To maintain conservatism for the ZOI, an S of 0.01 has been adopted. The drawdown results there adopted for this assessment is the blue graph line presented in Figure I.12.
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