Lighting Assessment WAI-985-000-REPLC-0019_Rev 0.Docx Waihi North Project Page 35 of 35 21/06/2022 Assessment of Environmental Effects: Lighting REVISION: 0 - Final 4. CONCLUSION Artificial lighting will be required to support WNP construction and on-going operations whenever activities are undertaken outside of daylight hours. In all WNP situations, direct spill light should be able to be contained to comply with the Hauraki District Plan requirement for a maximum of 8.0 lux (lumens per square metre). The possible exception being lighting to the WUG SFA site entry gate at the northern end of Willows Road where a streetlight(s) installed for safety may exceed the 8.0 lux spill on the road. Direct light spill would be very localised to the lighting pole(s) with effects minimised by the use of flat-glass (zero upward component) luminaire(s), backlight shielding (if required), appropriate luminaire orientation, and the use of 3000K LED technology. Direct light spill effects are unlikely to be an adverse effect for neighbours given the very localised spill light effect. The area for the WUG SFA, mine portal, and rock stack, is presently sparsely illuminated. Above-ground construction activities requiring artificial lighting will result in an increase in both glare and sky-glow from locations with a view of the area. Mobile lighting plant has the most potential to create these effects, however, they could be mitigated by careful plant selection, location, and luminaire orientation and aiming (i.e., into the site). Furthermore, activities in potentially sensitive locations could be undertaken during daylight hours only. Such management could be included in the procedures for the use of mobile lighting plant. If appropriate management combined with careful lighting control is undertaken, then the potential effects are expected to be minor given their temporary nature and them predominantly occurring during day shift operations. Night-time activities in sensitive locations would ideally be minimised. Permanent lighting to the Willows Road SFA would be designed to minimise both glare and sky glow effects such that they are less than minor. The GOP and Processing Plant areas of the WNP occur in proximity to existing mining operations. As such, these areas presently either have some form of artificial lighting to support operations or will be set against the backdrop of existing operational areas. The NRS and TSF3 areas may operate during darkness, requiring both vehicle lighting (head, tail, task, and security) and mobile lighting equipment. In addition to lighting intensity, rapidly changing lighting, such as vehicle security lighting, can be obtrusive and be visible from several kilometres away. Both locations would produce lighting effects that would be visible from various locations outside of the mine site. The extent of effects will depend upon the perspective of the viewer, and the viewing location. For those residents who value the existing darkened night environment, the changing lighting effects could range from “Moderate-Low” to Moderate-High” (using Boffa Miskell’s visual effect ratings). Mobile lighting plant has the most potential to create glare and sky glow effects, given the need to illuminate large construction activities and/or changing operational areas. The effects are expected to be minor given their proximity to existing mining operations, temporary nature and the Standard Operating Procedure to position the lighting towers so that they “Do not shine towards a public road or buildings”. Permanent lighting to these areas is likely to be an improvement over that presently installed throughout the existing mine, with lesser effects from glare and sky glow due to the change to LED lighting technology and appropriate luminaire selection, orientation, and aiming. The effects are expected to be less than minor in the context of the existing mine lighting.
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