GHD | Oceana Gold (New Zealand) Limited | 12537997 | Gladstone Pit TSF i Contents 1. Introduction 4 1.1 Background 4 1.2 Purpose of this report 4 1.3 Scope of works 4 1.4 Limitations 4 1.5 Acronyms 5 2. Project setting 7 2.1 Project location 7 2.2 Site geology 7 2.2.1 Geological setting 7 2.2.2 Landslides near Gladstone pit. 9 2.3 Geotechnical properties 10 2.3.1 Tailings 10 2.3.1.1 Index properties 10 2.3.1.2 Hydraulic properties 10 2.3.1.3 Production rate 11 2.3.2 Gladstone pit slope design parameters 11 2.4 Hydrogeology and groundwater 12 2.4.1 Background 12 2.4.2 Shallow groundwater system 12 2.4.3 Deep groundwater system 13 2.4.4 Gladstone Hill wetland 15 2.5 Geochemistry 15 2.5.1 Background 15 2.5.2 Overburden 15 2.5.3 Pit walls 16 2.5.4 Tailings 16 3. Basis of design 17 3.1 Pit overview 17 3.2 Summary of design basis 17 3.3 Potential impact classification 21 3.4 Geometric constraints 21 3.5 Design standards 21 3.6 Identified risks 21 4. Development of GOP TSF 23 4.1 General 23 4.2 Facility geometry 23 4.3 Materials and zoning 23 4.4 Construction aspects 25 4.5 Storage capacity 27 4.6 Construction schedule 28 4.7 Tailings management strategy 30 4.7.1 Overview 30 4.7.2 Tailings pipeline 30
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