GHD | Oceana Gold NZ Ltd | 12552081 | Geochemical Assessment Wharekirauponga Underground Mine (WAI985-000-REP-LC-0013) 11 4.2 Spoil Composition 4.2.1 Willows Access Tunnel – Multi Element Analysis Analytical results from spoil representative of the Willows Access Tunnel at the Willows Road Farm end are summarised in Table 1. The dataset includes the results from drill core samples that intersect with the proposed Willows Access Tunnel (WNDD005 and WNDD006) and core samples collected from the vent shaft location. Additionally, samples have been taken from the southern boundary of the identified orebody - (WKP100 – WKP102) and are considered to be comparable to the deeper sections of the Willows Access Tunnel in the vicinity of the orebodies. These samples are represented in WUG Mine dataset (Table 2). Based on the conceptual model of the geology (shown in Appendix A), spoil from the Willows Access Tunnel is expected to be predominantly sourced from the andesitic material. The data presented in Table 1 is considered to be comparative to the geochemistry of spoil material from current operations at Waihi (AECOM, 2018; AECOM, 2022). The acid generating potential and trace element composition of the Willows Access Tunnel is therefore considered comparable to that currently encountered at OceanaGold’s Waihi operations based on the data collected to date.
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