OceanaGold Waihi North Project Vibration Performance Assessment Page 2 of 41 Project Number: HP2006-2 Heilig & Partners Save Date: 21/06/2022 5:55:00 PM ABN 56 082 976 714 File Name: WAI-985-000-REP-LC-0018_Rev 0 seeks to quantify the impacts that occur from blasting in the two new mining activities, together with the associated decline and access tunnels. WNP will be authorised by resource consents from the Hauraki District Council and the Waikato Regional Council. Consideration of the effects associated with blasting are matters to be assessed by the District Council. All level information in this report is based on a mine datum set at 1,000m below a pre-1949 geodetic datum. The current standard, New Zealand Vertical Datum 2016 (NZVD2016), is approximately 1,002m above the mine datum. That is, reduced levels stated in this report can be reduced by 1,002m to approximate the same level to NZGD2000/NZVD2016. The key outcomes sought by the Hauraki District Plan relevant to the vibration assessment are: Provide for the utilisation of the mineral resource in the Rural Zone To avoid, remedy or mitigate any adverse effects of prospecting, exploration and mining activities in the Conservation (Indigenous Forest) Zone. Provide for the social, economic and cultural well-being of the people of the District, and for their health and safety Ensure that the amenity values of Waihi and the wider community are protected Ensure that vibration levels generated by land use activities do not adversely affect the amenity values enjoyed by other land users. This vibration assessment has been prepared to demonstrate that WNP can be undertaken in a manner that is not contrary to or inconsistent with these key outcomes. 2. PROJECT DESCRIPTION The following sections describe the mining areas that will be active during WNP. 2.1. Gladstone Open Pit The application seeks a land use consent for the proposed GOP which covers open pit mining and mining operations from development and mining through to rehabilitation of the land. The pit is for the most part located outside the existing boundaries of the Martha Mineral Zone. The GOP will be developed in contiguous stages and produce 2.6Mt of ore and 18.7Mt of rock over a period of about six years. The key aspects of the pit design include: Comprises two conjoined pits sited over Gladstone Hill and Winner Hill to a maximum depth of around 125 metres. Removes the existing Favona portal and portal infrastructure. Establishes a new portal and portal infrastructure in an area north of the pit (Gladstone portal). The extent of the blasting areas for the GOP are shown in Figure 2.
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