The Power of Commitment v Table 10 Flood levels in the Mataura Stream adjacent to proposed portal infrastructure 32 Table 11 WBM Assumed Water Quality Inputs 37 Table 12 Additional Ohinemuri Loading (kg/day) 50 Table 13 Mataura Stream water quality 53 Table 14 Modelled Discharge Water Quality 66 Table 15 Ohinemuri in-stream water quality and modelled water quality at sample location OH6 67 Table 16 WTP Discharge and Ohinemuri River Monitoring (currently consented) 73 Table 17 WTP Discharge and Ohinemuri River Monitoring (recommeded) 73 Table 18 Mataura Stream Monitoring (recommeded) 74 Table 19 Wharekirauponga Stream Monitoring (recommeded) 74 Figure index Figure 1 Waihi North Components (Overview) 2 Figure 2 Waihi North Components (Baxter Road Facilities) 3 Figure 3 Waihi North Components (Willows Facilities) 3 Figure 4 Schematic Site Water Management System 7 Figure 5 Aerial overview of OceanaGold’s current Waihi Operations 8 Figure 6 Ohinemuri River receiving environment and key locations 9 Figure 8 Proposed WTP Flow and Treatment Infrastructure 12 Figure 9 Existing Collection and Contingency Pond Locations 20 Figure 10 Annual Measured Rainfall Depths for Golden Cross 23 Figure 11 Ohinemuri River and Tributaries in the vicinity of Waihi 24 Figure 12 Annual Measured rainfall Depths for Waihi 25 Figure 13 Mataura Stream and the Ohinemuri River 26 Figure 14 Mataura Stream AWBM synthetic stream flow compared with M1 flow gauging data 27 Figure 15 Approximate locations of permanent monitoring locations 28 Figure 16 Wharekirauponga Stream flow compared with flow gauging data 29 Figure 17 Wharekirauponga Flow duration frequency curves 29 Figure 18 Ohinemuri River Sub-catchments 30 Figure 19 Mataura Stream shown in the NZ Flood Statistics Henderson Collins V2 Layer 32 Figure 20 Mataura Stream flooding depth 100 Year ARI flood 33 Figure 21 Ohinemuri and Ruahorehore 100 year flood plain 34 Figure 22 Mataura Stream Water Quality Sampling Locations 35 Figure 23 TSF2 Decant Water Quality 41 Figure 24 Willows Rock Stack Collection Pond Location 43 Figure 25 Willows Rock Stack, minimum collection pond sizing (24-Hour event, C=1) 43 Figure 26 Proposed TSF3 Collection Pond 44 Figure 27 TSF3 collection pond, minimum collection pond sizing (24 Hour event, C=1) 45 Figure 28 WSFA Flow Diagram 47 Figure 29 Willows Rock Stack Development 48 Figure 30 Predicted Maximum Tunnel Inflow (High K) 48
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