GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 49 . The likely upper bound of the extent of unsaturated andesite in the deep groundwater system is presented in plan view in Figure 3.14. The maximum extent perpendicular to the vein system was informed by the results presented in Table 3.7, while the assessment of the extent along the strike of the vein considered: – The interpreted site setting using existing groundwater monitoring levels, and the impacts experienced during dewatering of Favona. It is assumed that groundwater within the veins and surrounding andesite at Gladstone will respond in a similar manner to that at Favona. – Favona mine dewatering is predicted to have resulted in an upper bound drawdown extending from P60, which is fully dewatered, to GLD04 where the effects of dewatering are not detectable. – During excavation and dewatering of the GOP, the maximum point of drawdown will be the centre of the pit approximately 200 m southwest of P60. The predicted upper bound drawdown has therefore been extended the same distance southwest of GLD04.
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