Wambo Coal AEMR 2011-2012 - Peabody Energy

2011-2012 AEMR
January 2009, the waste from the Open Cut
workshop is now managed as part of the TWMS.
Underground portal area, and
Open Cut workshop and wash down area.
The TWMS was reviewed during the reporting
period and a revised contract with the preferred
licensed waste contractor commenced in December
2011.
2.6.1 Sewage Treatment and
Disposal
Sewage from the various areas of mining operation
is treated in four onsite treatment systems as
follows:
CHPP Bathhouse – septic tank system which
feeds to a transpiration area;
CHPP Control Room – biocycle system;
Administration Buildings – effluent system
pumps to a transpiration dam located to the
west of the complex; and
North Wambo Underground Portal – effluent
collection tank.
The Wollemi Bathhouse and Facilities are no longer
in use. The effluent treatment system is not
operational and these facilities have now been
decommissioned.
Effluent treatment systems are inspected and
maintained on a periodic basis to ensure effective
operation. All effluent collected from the
Underground portal is disposed of by a licensed
contractor and records are maintained on site.
2.6.2 Rubbish Disposal
Bulk garbage bins for each waste stream are
located around site. These bins are collected and
managed on a regular basis by a licensed waste
contractor. For details of waste disposed and
recycled during the reporting period please refer to
Table 2.4.
2.6.3 Oily Waste Disposal
Waste oils from the site are collected, stored and
are removed by a licensed waste contractor on a
periodic basis for reprocessing and reuse. For
details of waste oil disposal during the reporting
period please refer to Table 2.4.
A mix of passive and active oily water separator
systems for the separation of hydrocarbons from
oily water runoff, are located across the site
including:
the rail load out,
Licensed waste contractors remove collected waste
oil from the separators on a regular basis. Routine
inspections are carried out on all systems to ensure
that there are no blockages or overflows. Records of
all waste disposals are kept on site.
2.7 ROM and Product Coal
Stockpiles
A 70,000 tonne ROM coal stockpile for underground
coal is located near the Underground portal level,
just east of the Underground entrance.
Underground coal is conveyed to the Underground
ROM stockpile from the portal entrance by
Conveyor CV01.
Coal is transported from the Open Cut and
Underground ROM Stockpile via truck and either
tipped directly into the 400 tonne ROM hopper or
stockpiled adjacent to the ROM bin. The ROM
stockpile area is approximately 200m x 200m with a
ROM coal storage capacity of approximately
250,000 tonnes.
The capacity of WCPL clean coal stockpile is
approximately 500,000 tonnes.
2.8 Water Management
The water management system at WCPL comprises
clean water (imported water from the Hunter River
or Wollombi Brook), mine water (collected run-off
from disturbed catchments or recycled water from
the CHPP) and fresh water (either imported from the
town supply or collected rainwater). The water
management system is illustrated in Figures 2.4
and 2.5 and major storages are presented in Table
2.3.
A network of storages and drains has been
established to capture runoff from mine water
catchment areas. Runoff from areas disturbed by
mining (including the CHPP and associated
industrial areas) is collected in Open Cut voids and
other mine water storages. These storages are
used as priority water sources for the CHPP and
dust suppression. Runoff from haul roads is treated
in sediment dams or diverted to mine water
storages.
CHPP tailings are discharged to the Hunter Pit
tailings dam. Water that is liberated from the settled
tailings filters through spoil at the southern end of
the dam and reports to the North Homestead Pit.
Water is reticulated from this pit back to the CHPP.
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