Overpressure Levels 120dBL Overpressure Contour 115dBL Overpressure Contour 125dBL Overpressure Contour 128dBL Overpressure Contour 110dBL Overpressure Contour Explosive Weights More than 15 kilograms Between 9 and 12 kilograms Between 12 and 15 kilograms Between 6 and 9 kilograms Between 3 and 6 kilograms Less than 3 kilograms 200 400 600 800 1000m SCALE 0 H G F E D C B J I N K M L A H G F E D C B J I N K M L A 1 5 4 3 2 6 7 10 9 8 1 5 4 3 2 6 7 10 9 8 In preparing this drawing, HP have made certain assumptions. We have assumed that all information and documents provided to us by the Client or as a result of a specific request were complete, accurate and up to date. Where we have obtained information from a Government register or database, we have assumed that the information is accurate. Where an assumption has been made, we have not made any independent investigations with respect to the matters the subject of that assumption. We are not aware why any of the assumptions are incorrect. Created using TunnelTRAP Software Revision History Plate No. 1 P.O. Box 1 76 QLD. 4074. Australia 1 Mt.Ommaney Date Drawn: 5 April 2022 Project Description: Ref No: Gladstone Blasting R1: Original Job No: HP2003-2 Telephone +61 7 3715 7599 Mobile 0419 196 369 Facsimile +61 7 3715 7588 Email [email protected] OCEANAGOLD - Gladstone Pit - Modelled overpressure contours from blasting of the Gladstone Pit and back calculated explosive weights of 16 kilograms to comply with a vibration criterion of 5mm/s at sensitive receivers.
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