7 OGNZ WUG mine: assessment of potential ecological effects Project 2034 Dust creation from surface construction activities (short-term) Drill platform construction and surface exploration drilling. Controls: nil. Negligible Very Low over a small area Resource consent, which will be sought for exploration drilling for vent shafts. Water pollution from surface drilling (short-term) Centrifuge system in place to refine waste from surface drilling, sumps to contain any spills. Removal off site as is currently undertaken. Controls: Separation of waste, sumps, off-site disposal. Negligible Very Low over a very small area Resource consent, which will be sought for exploration drilling for vent shafts. Vegetation/ habitat loss Vegetation/ habitat removal unavoidable to allow for vent shafts. Controls: Avoid large trees, choose sites with no frogs (or low demonstrated risk of presence). Low Very Low over a small area Either already approved under existing WAA from DOC, and or will be applied for new sites. Vegetation growth/ density/ quality Regenerating vegetation following clearance might be structurally different and of differing quality compared to pre-development level. Revegetation forest structure notably different to secondary/ primary forest structure. Controls: Requirements for vegetation handling and site rehabilitation. Low Very Low over a small area Either already approved under existing WAA from DOC, and or will be applied for new sites – in terms of revegetation and vegetation management requirements. Erosion and sedimentation (shortterm) Sediment generation and erosion may occur where best practice methods fail, potentially affecting habitat quality, egg laying and brooding sites. Controls: Requirements for vegetation handling and site rehabilitation. Present controls include fencing drill site with silt fence equivalent to exclude frogs – may also reduce sediment movement. Negligible Very Low over a very small area Resource consent, which will be sought for exploration drilling for vent shafts. Pest influx and associated predation pressure (short-term) Rodents potentially attracted to disturbed habitats during works and potentially increased predation risk to local frogs. Negligible Very low over a wide area Resource consent, which will be sought for exploration drilling for vent shafts.
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