The Wilpinjong Mine is located in the Permian Illawarra Coal Measures on the northwest margin of the Sydney Basin. This coal measure is around 115m thick in the area, where the dominant lithologies are mudstone, siltstone, sandstone, coal, carbonaceous mudstone and tuffaceous claystone. The coal seams of interest at Wilpinjong include the Moolarben seam and the Ulan seam. The Wilpinjong mine accesses the Ulan Seam, a 15m-thick seam that is hosted at the base of the late Permian aged Illawarra coal measures. The paleoenvironment is a protected swamp environment on the stable Carboniferous granite basement. The Ulan seam consists of ten plies, including plies of good quality coal, high ash coal, stony coal and partings of claystone, carbonaceous claystone, tuffs and other non-coal lithologies. The working plies at the Ulan seam are inter-bedded with clay stone and siltstone horizons. The seam is shallow and sub crops in the deposit area. The Coal Reserves reported are high volatile bituminous in rank. The various coal products making it marketable for thermal use in domestic electricity generation and export. Peabody classifies the Wilpinjong property as a coal deposit with low geological complexity based on the following factors: • The Ulan seam is laterally continuous and can be correlated using geophysical logs across large distances with high confidence; • The seam is relatively flat lying (1 to 3 degrees), gently dipping towards the north-northeast; • There are no major ........

Conventional open cut mining methods are used at the Wilpinjong Coal Mine, with a low strip ratio allowing for relatively rapid pit advance. The design of spoil/truck dumps takes into consideration the following parameters: • Overall Slope Angle should not exceed 37° (crest to toe angle). • Lift heights should be ~20 m to 30 m dump lifts with standoff distances of ~10 m to 15m for successive lifts. • Lift heights greater than 30m require specific Job Safety Analysis (JSA) • Dump height should be consistent with the natural stability of the material being dumped. In general, the higher the dump face, the greater the risk the dump face has of collapsing under the influence of the vehicle tipping. • The surface of the dump shall be free draining and comply with dumping procedures. • Seepage from the dump and natural groundwater inflow should be drained to sumps, and ponding at the toe of or within the in-pit dump should be kept to a minimum. • The dump designs and slopes are such that the run of water reports to the site sedimentation dams. • Reduced bench heights minimising the potential dump instability especially in weak material dumping spots. • Maintain a minimum berm, safety windrow or stop log at the tip face of ½ wheel height of the largest vehicle using the dump thereby increasing the Factor of Safety (FoS). • Where the base of the dump is subject to the influence of water or mud, recognise the requirement to dump short of the tip face; • Where crack ........

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