Original EA Amendment

MT MORGAN OPEN CUT PIT WATER QUALITY MODELLING stage 2 ● 6

contents

1. BACKGROUND

8

2. SCOPE OF WORKS

11 12

3. METHOD

3.1 Data gathering

12

3.1.1 Summary statistics of OCP data

12

3.1.2 Total metals and other parameters in the NEW TAILINGS

16

3.2 Modeling Approach

16

4. RESULTS

19

4.1 Results of Geochemical modeling 19 4.2 Comparison of mixing model output with the results of laboratory test 26 5. CONCLUSION 28 5.1 Limitations and Recommendation 28

APPENDIX A. NEW TAILINGS – LAB BENCH TESTS APPENDIX B. NEW TAILINGS + OCP WATER – LAB BENCH TESTS

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