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 D - Kinetic and Column Testing\WNP Draft v6_App D (Kinetic Column Testing)_20220504.docx Revision 5 – 07-Aug-2020 Prepared for – Anderson Lloyd – Co No.: 5719274 • Core intervals logged as not having an ‘Argillic’ or strong clay alteration were excluded; • Core intervals logged as not having visible Pyrite were excluded; • Core intervals logged as weathered or displaying obvious, pervasive oxidation were excluded. Examples of core intervals selected for Column testing are shown in Figure D6. Note, selected core intervals were processed to rock chips by SGS New Zealand Limited. Final samples comprised material where 80% passed through a 3.6 mm sieve opening. Figure D6 Examples of Core Selected for Column Testing Hydrothermal Breccia selected from Gladstone core 1120SP2GR1064. Intervals selected from 114.5-117.5 m. Photo provided by OGNZL. Andesite selected from core UW531 adjacent to the Gladstone Pit. Intervals selected from 46.3 - 49.7 m. Photo provided by OGNZL. Based on the stated selected criteria, the resultant selected cores only represent a small portion of the overburden material. However, they represent a ‘worse case’ sub-set with respect to the acid producing potential and trace element leaching and provide valuable information in regard to the geochemical properties, behaviour, and treatment of the andesite and hydrothermal breccia material expected. Each column comprised an approximate 60 kg composite sample. The rock was placed atop a layer of filter material (K1 gravel) in order to aid free drainage of the leachate and all leachate was collected throughout the duration of the field tests into food grade buckets and piping. Photographs of the final column set up are provided as Figures D6 and D7. Acid base accounting characteristics of the columns are shown in Figure D8. All material used within the various column tests show similar acid base accounting characteristics.
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