OceanaGold Waihi North Project Vibration Performance Assessment Page 28 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 amplitude of vibration for blasting events in the frequency spectra between 2 and 200Hz. The monitoring units will be configured to detect any increase in vibration above a pre-set threshold value. For the monitoring of blasting events, it is reasonable to record only events above around 0.75mm/s as traffic, stock and domestic animals can easily produce values exceeding a 0.75mm/s vibration threshold. In agreement with the Australian Standards AS2187.2-2006, Section J, the transducers will be placed in the ground rather than on the structure. At each of the monitoring sites, the sensors will be firmly attached to the ground to ensure adequate coupling between the ground and the sensor. The proposed monitoring sites will be selected based on: Proximity to the blasting area, ensuring that the potentially sensitive privately owned properties are appropriately monitored. A monitoring location that will offer a secure area that will minimise the possibility of interference from the public. Provide an accurate indication of the vibration level. Based upon the locations of these mining areas, the following vibration monitoring locations are proposed: For the GOP, monitoring locations will include those around the eastern end of the Waihi township such as Boyd Road, Moore and Clarke Streets locations. It is proposed the locations will generally replicate those used for the Favona mining For the plant access tunnel, multiple monitoring locations near to the tunnel alignment. The proposed locations include closest sensitive receivers along the Boyd, Golden Valley, Mataura and Oldfield Roads Figure 9 shows the proposed vibration monitoring sites which best achieve the requirements for the GOP. Where possible, and the location is considered representative, it would be beneficial to maintain the existing monitoring sites that were used for Favona and Correnso with the latter relevant for the Plant Access Tunnel. These locations have access to power as well as allowing for a continuity of monitoring results to better determine any anomalous vibration zones. The proposed monitoring locations are consistent with Favona sites. Figure 9 – Possible vibration monitoring sites the GOP For the plant access tunnel, the locations are shown in Figure 10. Given the short duration of effects, the monitoring arrangement could include roving units rather than establishing permanent monitoring sites.
RkJQdWJsaXNoZXIy MjE2NDg3