54 Oct 2021 OceanaGold WNP Project, Waihi - Archaeological / Heritage Assessment NORTH ROCK STORAGE (NRS) The Proposal Figure 52 shows the location and footprint of the NRS which will be designed to store both PAF & NAF rock. Also shown are the proposed topsoil stockpiles two of which are constructed at the northern extent of the Company owned land and adjacent to Golden Valley Road. The stockpile can contain up to 100,000 cubic metres of material and is constructed to a nominal height of 10m above natural topography. The northern toe of the stockpile is defined by the current alignment of the overhead power lines. The existing workshop structure, fuel bowser and grease storage facilities will need to be relocated approximately 160m to the south west. Any potentially hydrocarbon contaminated soils underlying and surrounding the structure may need to be removed and disposed of within the embankment constructions. An indicative uphill clean water diversion / stream diversion and NRS collection drain are shown in blue in Figure 52. The diversion drains include a clean water drain which reports directly to the Ohinemuri River and collects clean run-off and stream flows upstream of the NRS, and a dirty water drain which collects run-off from the NRS and reports to a collection pond. The drains are separated by a 6m wide perimeter road. The NRS and diversion drains do not encroach into the T13UP166 Significant Natural Area (SNA) scheduled in the District Plan.
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