GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 5 substances and/or site contamination) may change after the date of this Report. GHD does not accept responsibility arising from, or in connection with, any change to the site conditions. GHD is also not responsible for updating this report if the site conditions change. GHD has not been involved in the preparation of the Assessment of Environmental Effects (AEE), prepared by Mitchell Daysh and has had no contribution to, or review of the AEE other than in this technical report for water management. GHD shall not be liable to any person for any error in, omission from, or false or misleading statement in, any other part of the AEE. The GHD document containing the disclaimer is to be included in any other document, the entirety of GHD’s report must be used (including the disclaimers contained herein), as opposed to reproductions or inclusions solely of sections of GHD’s report. 1.4 Key Assumptions There are a number of assumptions applied to the work undertaken and these are listed throughout the document. The following key assumptions apply to all of the work presented in this document: The rewatering model utilised within the water balance model (WBM) is as outlined in GHD, 2018 (Appendix D) The conditions of the current WTP discharge consent, which provides for up to 52,000 m3/day of treated water to be discharged to the Ohinemuri River, apply. Cyanide treatment is doubled from current capacity of 6,000 m3/day to 12,000 m3/day to account for the higher production rates and multiple operational TSFs. WUG Mine and all related access tunnel groundwater inflows are based on the figures as provided by GWS, 2022.
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