OceanaGold Waihi North Project Vibration Performance Assessment Page 31 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 Figure 12 – Proposed monitoring locations within underground network It is proposed that vibration from the underground blasting will be monitored at three locations within the underground mine. This will provide the measured vibration values that will inform the calculations at other locations. It is proposed that vibration be extrapolated at an additional 12 assessment locations on the surface (referred to as Assessment A to Assessment L) with these positioned at a regular 500 metre grid spacing that covers the extent of the underground orebody. The inferred vibration values at these locations will be used to assess compliance with the permissible vibration criterion. The proposed representative locations are shown in the following image. The extent of the orebody is also shown. Figure 13 – Proposed surface assessment locations
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