www.valenza-engineering.com 381_R_04_Rev 0 OGNZL_WUG_Phase1_Conceptual_Mitigation TABLE OF CONTENTS ABBREVIATIONS ....................................................................................................................1 ABBREVIATIONS (Cont.) ........................................................................................................2 ABBREVIATIONS (Cont.) ........................................................................................................3 1. INTRODUCTION........................................................................................................1 2. BACKGROUND..........................................................................................................2 2.1. GEOLOGICAL SETTING AND MINERALISATION....................................................2 2.2. HYDROLOGY AND TOPOGRAPHY..........................................................................3 2.3. HYDROGEOLOGY....................................................................................................4 2.4. WHAREKIRAUPONGA UNDERGROUND PROJECT ...............................................5 3. PREVIOUS STUDIES ................................................................................................6 3.1. ACCESS TUNNELS ..................................................................................................6 3.2. POTENTIAL GROUNDWATER EFFECTS ................................................................8 3.3. POTENTIAL SURFACE WATER EFFECTS ............................................................11 4. CHARACTERISATION.............................................................................................13 4.1. SURFACE WATER SYSTEM ..................................................................................13 4.2. CHARACTERISATION OF SURFACE WATER - GROUNDWATER INTERACTIONS 15 5. MODELLING ASSESSMENTS.................................................................................16 5.1. PREVIOUS ASSESSMENTS AND MODELLING ....................................................16 5.2. GEOLOGICAL MODEL............................................................................................19 5.3. ENGINEERED MITIGATION MODELLING..............................................................19 5.4. CONCEPTUAL MITIGATION MODEL .....................................................................25 5.5. NUMERICAL MITIGATION MODEL ........................................................................28 6. GROUNDWATER MITIGATION MANAGEMENT.....................................................29 6.1. GROUNDWATER CONTROL STRATEGY..............................................................29 6.2. GENERAL MITIGATION AND CONCEPT BY ZONE...............................................32 6.3. GROUTING SEQUENCE AND SCENARIOS ..........................................................35 6.4. DEWATERING, DRAINAGE AND DEPRESSURISATION.......................................37 6.5. SEQUENCING AND MINE PLANNING ...................................................................37 6.6. EXAMPLE OF APPLICATIONS IN SIMILAR ENVIRONMENTS ..............................38 7. RESOURCE CONSENT PROCESS ........................................................................40 7.1. CONSENT CONDITIONS ........................................................................................40 7.2. GROUNWATER CONTROL STRATEGY DATA ACQUISITION ..............................41 7.3. ADDITIONAL FIELD PROGRAM.............................................................................42 8. MONITORING AND TRIGGER POINTS ..................................................................43 8.1. DEVELOPMENT OF MONITORING NETWORK.....................................................43 8.2. PRE-DEVELOPMENT .............................................................................................46 8.3. OPERATIONAL PHASE ..........................................................................................47 8.4. CLOSURE AND POST CLOSURE PHASE .............................................................47 9. CONCLUSIONS & RECOMMENDATIONS..............................................................48 10. REFERENCES.........................................................................................................50
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