HVO 2009 Annual Environmental Management Report - Final

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Coal & Allied – Hunter Valley Operations Groundwater 6,451 t (E) Coarse Reject 1,413 t (E) LEGEND Affected mainly by geometry eg depth, length and geology Affected mainly by climate Rain 3,649 t (E) Tails 8,680 t (E) Affected mainly by process eg production rate, moisture control Affected both by climate and process Affected by geometry, geology and process Evaporation 0 t Recycled Tails 4,850 t (E) (M) = Measured (E) = Estimated Dust Suppression 3,986 t HRSTS Discharges 499 t (M) Open Cut Pits & Pit Storages Coal Processing Plants Internal Recycling 1,345 t (E) Product Coal (E) 4,469 t (E) Lost to Tails and Spoil 7,068 t (E) Dewater 5,441 t (E) Fresh 0 t (E) Storage 8,793 t (E) ROM Coal 9,716 t (E) External (Poor) 30 t (E) Figure 10: HVO Salt Balance Schematic Diagram AEMR 2009 41
Coal & Allied – Hunter Valley Operations Water Inputs Water was supplied predominantly from three sources in 2009: Surplus mine water stored in pit; Intercepted runoff water; and Groundwater percolation into the open cut. A total of 564mm of rainfall was recorded at HVO in 2009 producing an estimated 7,485ML of runoff from approximately 4,500ha of developed, disturbed and mining catchments. Water falling on undisturbed clean water catchments is diverted off site into natural systems where possible. Rainfall runoff was the largest input to the site mine water balance in 2009. Groundwater contributed approximately 1,251ML to the site water supply. Independent groundwater Modelling of the pits which comprise HVO indicate a portion of total groundwater is contributed from connected Hunter River alluviums. Table 14 lists the Modelled amounts of water entering the pit and the reference from which the number is generated. Alluvial groundwater intercepted in North Pit was measured based on pump out rates during active mining in this area. Since that time the pit has been back filled with spoil and the water level has risen to the base of the barrier wall, hence seepage from the river alluvium will have reduced significantly. The seepage figure provided is considered an overestimate. No Modelling has been undertaken to determine seepage rates with the current conditions in North Pit. Table 14: Modelled or Measured Groundwater Contribution from Connected Hunter River Alluvium Pit Alluvial Groundwater Intercepted (ML/Day) Source Reference Cheshunt 0.22 Hunter River MER 2005 Barrys 0.22 Hunter River Coffey 2008 North Pit (Alluvial lands) 0.55 Hunter River Measured Carrington 0.07 Hunter River MER 2010 Mackie Environmental Research (2005), Assessment of River Leakage Within the Cheshunt Pit Buffer Zone, Amended Report, April. Coffey Geotechnics (2008), Preliminary Groundwater Modelling Study, Cheshunt Pit, HVO South Coal Project, July. Mackie Environmental Research (2010), Carrington Extended- Review of Mining Related Impacts on the Paleochannel Groundwater System. Groundwater intercepted from connected surface alluviums is estimated to have contributed 387ML to the site during the reporting period. HVO has a high security licence entitlement for 2,685ML of water in Zone 1B of the Hunter River. Inflow from Hunter River alluvium is deducted from this entitlement. No fresh water was pumped from the Hunter River during the reporting period. Freshwater usage is expected to remain low in 2010 due to a large volume of stored mine water at the end of 2009. All water extracted from the Hunter River is recorded against Water Access Licences issued by NOW. Refer to Section 1.2.1 (Table 3) for details of these licences. AEMR 2009 42
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HVO 2009 Annual Environmental Management Report - Final

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