GHD | Oceana Gold (New Zealand) Limited | 12537997 | Gladstone Pit TSF 7 2. Project setting 2.1 Project location The proposed GOP will be situated over Gladstone Hill and Winner Hill. The processing plant is located immediately to the east of the pit and the Martha Pit conveyor is directly to the north. Current land use comprises rolling farmland and pastures, with a small pine plantation to the south-west. The Ohinemuri River is located approximately 300 m south-west of the GOP. 2.2 Site geology 2.2.1 Geological setting A review of geological information presented by OGNZL (2021), EGL (2021) and PSM (2021) has been completed and summarised herein. Regionally, the Waihi basin is defined as a series of localised north to north-east trending horst and graben structures. The basin is a result of a historic fault-controlled caldera structure (PSM 2021). The Waihi Fault is the largest of the bounding faults in the area and marks the northern border of the Waihi Basin and associated caldera. Other faults include the Martha Fault, Reptile Fault, Amaranth Fault, No 9 Fault and the Favona Fault. As shown in Figure 1, the GOP straddles the steeply dipping Western Fault and No 9 Fault. Figure 1 Major faults and veins near the GOP (PSM 2021) The geological setting in the Waihi area, and particularly the rock units to be encountered during pit development, can be described following three main groups:
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