OceanaGold Waihi North Project Vibration Performance Assessment Page iv of 41 Project Number: HP2006-2 Heilig & Partners Save Date: 21/06/2022 5:55:00 PM ABN 56 082 976 714 File Name: WAI-985-000-REP-LC-0018_Rev 0 levels of vibration. Fewer than 5 properties are modelled to receive more than 2mm/s with no property greater than 3mm/s. The current vibration environment around WUG is low and free of any sensitive properties within several kilometres of the blast area. The overall footprint of vibration impact remains very low with any perceptible vibration limited to a zone extending not more than 10% of the separation distance to properties. The vibration effects from the blasting of the Access Tunnel between WUG and the Processing Plant are minor but perceptible to the nearest residences because of the depth of the tunnel and the location at the eastern end of Mataura Road. The scale of blasting for the tunnel will be constrained by the properties around the Waihi East area. The advance rates for blasting of the tunnel will however ensure that the blasting progresses quickly with perceptible vibration persisting for not more than several months. The tunnel is expected to advance at approximately 50 metres per week. The analyses have shown that with good practices and control over explosive weights for the GOP, blasting can be completed for WNP without significant impact. In some areas of WUG where the mining occurs nearer to the surface, the blast design will necessitate some limitations on the explosive weight. OceanaGold has previously demonstrated through the mining of Martha over the previous 30 years, its capability to incorporate relevant blasting measures into its mine schedule. It is fully expected that blasting for WNP can be similarly accommodated.
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