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 modelling inputs ran the following steps, 1. Solution 1 (backfilled porewater) was calculated. 2. Equilibrium batch reaction was completed with Solution 1 and calcite iteratively to achieve pH 6.9 3. Equilibrium of all species: Calcite, Ferrihydrite, Al(OH)3(am), Lepidocrocite, Gypsum, FeAsO4:2H2O, Gibbsite, Manganite, Zn(OH)2 4. Sorption of hydrous ferric oxides

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