GHD | Oceana Gold (New Zealand) Limited | 12537997 | Gladstone Pit TSF 11 Figure 5 Saturated conductivity versus effective stresses 2.3.1.3 Production rate Planned tailings production rates for the Waihi Operations are shown in Table 1 (as provided by OGNZL on 17/6/2021). Only a portion of the total tailings produced will be deposited in GOP TSF (refer Table 3). Table 1 Tailings production rate for Waihi Operation Year Tailings (tonnes per annum) Year 1 805,653 Year 2 1,070,680 Year 3 1,084,217 Year 4 1,316,367 Year 5 1,725,217 Year 6 1,779,426 Year 7 1,779,426 Year 8 1,425,103 Year 9 – Year 15 800,000 2.3.2 Gladstone pit slope design parameters PSM (2021) conducted analysis of geological logs, core photographs and laboratory testing results to develop properties for the most relevant geotechnical units for slope design at GOP. Seven geotechnical units were identified by PSM: – Ignimbrite – Dacite (in north east only) – Volcaniclastic (in north east only) – Andesite – Classes 1 to 4, with Class 1 the highest and Class 4 the lowest rock quality. Representative specimens were sourced from each geotechnical unit and further laboratory tests were conducted, including multistage consolidated undrained (CU) triaxial tests and uniaxial compressive strength (UCS) tests. The CU triaxial tests and UCS were conducted in rock with typical strength as equal or less than R1 and R2,
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