The Power of Commitment iii Contents 1 INTRODUCTION ....................................................................................................... 1 1.1 Project Description 1 1.2 Scope 4 1.3 Limitations 4 1.4 Key Assumptions 5 2 BACKGROUND INFORMATION............................................................................... 6 2.1 Water Management Approach 6 2.2 WTP Description 10 2.2.1 Operating Regimes and Discharge ........................................................12 2.3 WTP Performance 13 2.3.1 Trace Element Removal Rates ..............................................................13 2.4 Regime Compliance 15 2.4.1 In-stream Compliance............................................................................ 17 2.5 Collection and Contingency Ponds 18 2.5.1 Background ...........................................................................................18 2.5.2 Design Criteria....................................................................................... 19 2.5.3 Waihi North Project................................................................................ 19 2.6 Mine Dewatering 20 2.7 Tailings Storage Facilities 21 2.7.1 General..................................................................................................21 2.7.2 Process Water Recycle ......................................................................... 21 2.7.3 Seepage ................................................................................................ 21 3 HYDROLOGICAL AND CLIMATIC DATA................................................................. 23 3.1 Rainfall 23 3.1.1 Mataura Stream and Wharekirauponga Stream catchments.................. 23 3.1.2 Waihi Operations ...................................................................................23 3.2 Hydrology 25 3.2.1 Mataura Stream.....................................................................................25 3.2.2 Wharekirauponga Stream......................................................................27 3.2.3 Ohinemuri River..................................................................................... 30 3.3 River Flood Analysis 31 3.3.1 Mataura Stream.....................................................................................31 3.3.2 Ohinemuri River..................................................................................... 33 4 WATER QUALITY..................................................................................................... 35 4.1 Background 35
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