6 OGNZ WKP mine: assessment of potential ecological effects Project 2034 Table 1. Activities that are assumed to form part of the ‘baseline state’ for this effects assessment. Potential magnitude of adverse effect is after controls are applied and is in the context of the potential number of Archey’s frogs andArchey’s frog habitat within the area above the mine underground footprint, relative to Archey’s frog population estimates and area occupied for the Coromandel. Potential level of adverse effect is the combination of magnitude of effect and the value of Archey’s frogs, as per EIANZ method (seeSection 3). Potential adverse effect Explanation Magnitude of effect Potential level of adverse effect Relevant permission held or which will be separately sought by OGNZL Short term surface vibration (sustained/ steady/ continuous) During surface drilling and vent shaft installation. Consistent with existing exploration drilling. John Heilig modelling indicates that vibration will drop off after 20 m. The frog fenced areas (where there are no frogs present) are 20 m x 20 m in area with the drill rig occupying part of that area. Setbacks from the drill rig to the fenced area edge is 6 m so most of the increase to vibration may be out of range of known frogs. Note: shaft excavation is from underground. Controls: nil. Negligible Very Low over a very small area with very few frogs Resource consent, which will be sought for exploration drilling for vent shafts (consent will be sought for drilling at two sites). Short term surface noise (sustained/ steady/ continuous) During surface drilling and vent shaft installation. Consistent with existing exploration drilling. Note: shaft excavation is from underground. Controls: nil. Negligible Very Low over small area Resource consent, which will be sought for exploration drilling for vent shafts. Light from surface construction activities (short-term) Lighting during surface drilling. Light spill into the forest could influence presence/ behaviours/ predation risk. Consistent with existing use of drill platforms. Controls: Orientate to face inwards to platform. Cannot be reduced because of safety considerations for workers. Low Very Low over a small area Resource consent, which will be sought for exploration drilling for vent shafts. Odour from surface construction activities (short-term) Odour release into the environment and potential impacts on frog olfactory/ chemosensory system (e.g. diesel fumes from generator). Controls: nil. Low Very Low over a very small area Resource consent, which will be sought for exploration drilling for vent shafts.
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