Wambo Coal AEMR 2010-2011 - Peabody Energy

Wambo Coal Pty Limited2010-2011 AEMRNODATE &TIMERECEIVEDAREARESPONSIBLECAT.ISSUE11 16/01/2011 Brent Cleaning 1 Fuel trailer parked in Heavy Vehicle Carpark leaking diesel fuel over night –Approx 60/100L spilled.12 17/02/2011 Downer EDI / OpenCut2 Blast event resulted in overpressureexceedence in violation of Wambo Coalconsent conditions resulting in asubsequent reportable incident to theDECCW.ACTION TAKENSpill controlled, contained and cleaned up usingabsorbant material. Safety clip refitted to the fuel nozzlefitting and checked for further leaks.In accordance with Wambo Coal’s statutory obligations,the DECCW was informed. A detailed investigation andreport was completed and sent to the DECCW on 24February 2010.Analysis of the blast footage has shown that the shotwas well contained by the stemming and the faceburden. Analysis of the wave trace from the Mullermonitor, in combination with overpressure modelingsuggest that the orientation of the pattern in combinationwith the surface delay (inter-hole) timings is likely to bethe main contributor to the overpressure reading. Thepeak pressure occurred right at the start of the trace,with the positive phase of the peak overpressurerecorded at 124.4dB at the Muller Blast Monitor.Preventative actions include: The use of slower timings when firing on thisorientation (42ms instead of 17ms). The use of new air overpressure modeling tools toanalyse the reinforcement patterns when designingthe pattern tie in. Smaller blasts, so that there are fewer holesavailable to reinforce the pressure front, whilst alsoreducing the stochastic nature of the system byminimising the timing scatter; and Continued monitoring of weather parameters at thetime of firing and delay of shots until morefavourable conditions prevail.13 8/03/2011 Downer EDI / OpenCut2 Blast event resulted in large Nox plumewhich blew in a NNW direction. GOS drillrig was in immediate direction of BlastFume. Drillers evacuated area byreturning to vehicles (but not driving awayfrom the plume).GOS drillers were notified of Blast Event. Drillers wereoutside the exclusion zone. Issue to be raised with GOSrepresentatives at toolbox meeting. Not sufficient fordrillers to take refuge inside car, need to vacate area ifpotential for contact with future blast plumes. GOSdrillers also to be aware of blasting board whenAppendix 3: Summary of Environmental Incidents