OceanaGold Waihi North Project Vibration Performance Assessment Page 19 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 planned WUG, the vibration levels in this area have been estimated by using data from the underground mining of other Waihi orebodies. An assessment for all vibration/distance/explosive weight relationships for the Waihi region is therefore based upon a fixed α term of -1.49. Table 3 indicates the limits of the data which are identified as being applicable to each of the projects. Project Area Applicable Vibration Relationship Data Origin GOP Regress selected vibration data from the Moonlight, Favona and Trio underground operations WUG Regress all vibration data from post 2016 underground blasting Table 3 - Source data location to establish relevant vibration relationship for each project For reference, the vibration versus scaled distance graphs for each of the mining areas are given in Figure 7. WUG Gladstone Pit Figure 7 - Vibration vs scaled distance based upon previous projects. These data have been used to develop the project specific relationships Figure 7 shows the vibration/distance/explosive weight relationships for each of the two mining areas forming the WNP. A comparison of the relationships show that the “average” relationship is reasonably consistent across both sites with the GOP relationship showing the lowest constants. The following Table 4 shows the regressed site-specific vibration relationships. Project Area Basis of Relationship Average Vibration Relationship Effective maximum Vibration Relationship GOP Regress existing blasting from the Moonlight underground focussing on the production blasting data for stopes. The analyses are limited to those blasts within 500 metres of the centre of the GOP = 1520� √ �−1.49 = 3520� √ �−1.49 WUG Regressed Martha blast data for all blasts that lie within 500 metres of the centre of the pit. = 1295� √ �−1.49 = 1990� √ �−1.49 Table 4 - Summary of vibration/distance/explosive weight relationships for each project 9.1. Comparison with Previously Predicted Results A review of the recorded vibration data from other projects undertaken at Waihi over the previous 30 years has shown variability in vibration levels that reflects the effect of the parameters listed in Section
RkJQdWJsaXNoZXIy MjE2NDg3