Supporting Technical Assessments

Oceana Gold Project Quattro Project Quattro Geochemical Assessment – Tailings and Overburden, Treatment and Mitigation \\na.aecomnet.com\lfs\APAC\Christchurch-NZCHC1\Legacy\Projects\605X\60544823\6. Draft Docs\6.1 Reports\Waihi North\App F - PHREEQC Outputs\WNP_App F_PHREEQC_25.05.22.docx Revision 5 – 07-Aug-2020 Prepared for – Anderson Lloyd – Co No.: 5719274 The predicted TSF1A and TSF2 decant modelling values are based on four scenarios. The four scenarios were the known porewater geochemistry with the trace element correction factor applied: • Scenario 1 – TSF1A – Mean (known pondwater geochemistry) x TSF1A Storage Mean trace element correction factor • Scenario 2 – TSF1A – 95 %ile (known pondwater geochemistry) x TSF1A Storage Mean trace element correction factor • Scenario 3 – TSF2 – Mean (known pondwater geochemistry) x TSF2 Storage Mean trace element correction factor • Scenario 4 – TSF2 – 95 %ile (known pondwater geochemistry) x TSF2 Storage Mean trace element correction factor

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