Supporting Technical Assessments

Waihi North Project Preliminary Site Investigation (Ground Contamination) Williamson Water & Land Advisory Limited i Waihi North Expansion Project no: WWLA0435 Document title: Waihi North Project - Preliminary Site Investigation (Ground Contamination) Revision: 6 Date: 16 June 2022 Client name: OceanaGold (New Zealand) Ltd Project manager: Wendi Williamson Author(s): Cherise Martin/ Lauren Windross File name: G:\Shared drives\Projects\Oceana Gold\WWLA0435_Waihi North Project\Deliverables\Revision 3\WWLA_WNP_PSI_Rev3_041121.docx Williamson Water & Land Advisory PO Box 314, Kumeu 0841, Auckland T +64 21 613 408 Document history and status Rev Date Description Prepared Reviewed Draft 1 24 September 2021 Preliminary Site Investigation for Ground Contamination (DRAFT) Cherise Martin/ Lauren Windross Wendi Williamson Draft 2 13 October 2021 Preliminary Site Investigation for Ground Contamination (DRAFT) Cherise Martin/ Lauren Windross Wendi Williamson Draft 3 4 November 2021 Preliminary Site Investigation for Ground Contamination (DRAFT) Cherise Martin/ Lauren Windross Wendi Williamson Draft 4 25 November 2021 Preliminary Site Investigation for Ground Contamination (DRAFT) Cherise Martin/ Lauren Windross Wendi Williamson Draft 5 9 May 2022 Preliminary Site Investigation for Ground Contamination (DRAFT) Cherise Martin/ Lauren Windross Wendi Williamson Final 0 16 June 2022 Preliminary Site Investigation for Ground Contamination (FINAL) Cherise Martin/ Lauren Windross Wendi Williamson Distribution of copies Rev Date issued Issued to Comments Draft 1 24 September 2021 OceanaGold, Mitchell Daysh Draft for internal review Draft 2 13 October 2021 OceanaGold, Mitchell Daysh Final draft for approval Draft 3 4 November 2021 OceanaGold, Mitchell Daysh Final Draft 4 25 November 2021 OceanaGold, Mitchell Daysh Final, incorporating additional comments. Draft 5 9 May 2022 OceanaGold, Mitchell Daysh Final, incorporating minor changes. Final 0 16 June 2022 OceanaGold, Mitchell Daysh Final for consent Front cover image source: Oceana Gold

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