Extraction Plan - Peabody Energy

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Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8Mining activities at the Wambo Coal Mine include both open cut and underground mining of severalcoal seams from the Wittingham Coal Measures, which combine with the Newcastle Coal Measures toform the Singleton Supergroup (Figure 5). A summary of the coal measure stratigraphy underlying theWambo Coal Mine area is provided in Figure 5.Wittingham Coal Measures are divided into the Jerrys Plains Subgroup, Vane Subgroup, DenmanFormation and Archerfield Sandstone (WCPL, 2003). The Jerrys Plains Subgroup contains eightformations with 15 named coal seams (WCPL, 2003). The Jerrys Plains Subgroup is up to 800 m thickand generally consists of relatively coarse clastic sediments (DMR, 1993). The sedimentary rocklayers above and between coal seams are typically lithic sandstone, siltstone and conglomerate, whileminor carbonaceous claystone and tuff occurs throughout the sequence (WCPL, 2003).Coal seams previously, currently and proposed to be mined at the Wambo Coal Mine include(Figure 5):• Whybrow Seam;• Redbank Creek Seam;• Wambo Seam;• Whynot Seam;• Arrowfield Seam; and• Bowfield Seam.These seams dip gently to the south-west at approximately 2° to 3° with minor local variations due tovarying thicknesses of inter-seam sediments and fault zones (WCPL, 2003). Faulting usually trendsnorth or north-east to south-west with normal throws of up to 10 m with some low angle thrusts(i.e. reverse faults) of variable throw (MineConsult, 2001).The North Wambo Underground Mine mines the Wambo Seam which produces a low ash thermalcoal (WCPL, 2003). ROM coal is crushed and washed at the Wambo coal handling and preparationplant. Product coal from the North Wambo Underground Mine is considered suitable for export anddomestic markets.The overburden of the Longwalls 7 and 8 Application Area consists of gently, south-west dippingsedimentary strata comprising medium strength thin to medium interbedded sandstone and siltstonewith some thickly bedded sandstone units (Technical Report 1). Low strength carbonaceousmudstone, mudstone and coal immediately overly and underlie the coal seams present in theoverburden (Technical Report 1).Previous and Future MiningThere are a number of previous workings in the vicinity of Longwalls 7 and 8 including (Figure 6):• Bord and pillar workings in the Wambo Seam to the south-east of Longwall 8.• Bord and pillar workings and extracted longwall panels associated with the Homestead Mine andthe Wollemi Mine in the Whybrow Seam, located approximately 45 to 90 m above the WamboSeam.• Extracted longwall panels associated with the United Mine in the Woodlands Hill/Arrowfield Seam(under a lease swap arrangement), located approximately 170 to 220 m below the Wambo Seam.Longwall 8 is located within the inrush control zone associated with the historical bord and pillarworkings in the Wambo Seam. Relevant monitoring and management measures are detailed in theInrush Management Plan. Management measures include maintaining a geotechnically-stable barrierbetween Longwall 8 and the previous workings, and drilling to define the integrity of the barrier.EP/SMP LW7-8 Rev B December 2012 Page 11
SUPERGROUP GROUP SUBGROUP FORMATION SEAMNARRABEEN GROUPWIDDEN BROOK CONGLOMERATEGreigs Creek CoalGLEN GALLICSUBGROUPRedmanvale Creek FormationDights Creek CoalDOYLES CREEKWaterfall Gully FormationSUBGROUPPinegrove FormationNEWCASTLE COALMEASURES1HORSESHOECREEK SUBGROUPLucernia CoalStrathmore FormationAlcheringa CoalSINGLETONSUPERGROUPWITTINGHAM COALMEASURESPreviously known as the Wollombi Coal Measures.Coal reserves currently, previously and proposed to be mined at the Wambo Coal Mine.Coal reserves to be mined by the Wambo Coal Mine where the upper three plies of theWarkworth Seam combine with the two plies of the Bowfield Seam.123APPLETREE FLATSUBGROUPJERRYS PLAINSSUBGROUPVANE SUBGROUPClifford FormationCharlton FormationAbbey Green CoalWATTS SANDSTONEDENMAN FORMATIONMount LeonardWhybrow Seam 2FormationAlthorpe FormationRedbank Creek Seam 2Malabar FormationBlakefieldMount OgilvieFormationMount ThorleyFormationBurnamwoodFormationARCHERFIELD SANDSTONEWambo Seam 2Whynot Seam 2SeamGlen Munro SeamWoodlands Hill SeamMilbrodale FormationFairford FormationBulga FormationFoybrook FormationSaltwater Creek FormationArrowfield Seam 2Bowfield Seam 2Warkworth Seam 3Mount Arthur SeamPiercefield SeamVaux SeamBroonie SeamBayswater SeamWAM-09-15_EP_004BAfter: DMR (1993)W A M B O C O A L M I N EFIGURE 5Stratigraphy of theWambo Coal Mine Area
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